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Signed-off-by: Alejandro Colomar <alx@kernel.org>
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Signed-off-by: Alejandro Colomar <alx@kernel.org>
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Signed-off-by: Alejandro Colomar <alx@kernel.org>
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Signed-off-by: Alejandro Colomar <alx@kernel.org>
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Call pcre2grep(1) only once, which allows removing named pipes. This is
an important optimization, and will also allow accepting several file
names in the command line (in a future commit). The source code is also
significantly simplified.
It has a caveat: this single call to pcre2grep(1) will consume more
resources, and will crash on certain input files. The workaround is to
restrict the search to just one or a few types of code. Document this
in the manual page. This caveat only applies to very specific files,
which so far I've only found in the Linux kernel source tree.
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grep only one file (or stdin).
The current implementation doesn't allow filterin standard input, which
I miss some times. I'm removing this feature now, to be able to rewrite
most of the program in a way that allows filtering stdin, and then will
consider adding back a recursive mode if necessary.
Also, don't remove the two blanks at the start of the output, for
consistency when calling this program via xargs(1), which will become
more common now that it only handles single files.
Signed-off-by: Alejandro Colomar <alx@kernel.org>
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This program shouldn't know about file names. If that is wanted, use
something like `find ... | grep ... | xargs grepc ...`.
Signed-off-by: Alejandro Colomar <alx@kernel.org>
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This program shouldn't know about file extensions. If that is wanted,
use something like `find ... | grep ... | xargs grepc ...`.
Signed-off-by: Alejandro Colomar <alx@kernel.org>
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macros, or other macros
Signed-off-by: Alejandro Colomar <alx@kernel.org>
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Also, use names consistent with the command-line option arguments.
Signed-off-by: Alejandro Colomar <alx@kernel.org>
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Also, use names consistent with the command-line option arguments.
Signed-off-by: Alejandro Colomar <alx@kernel.org>
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Signed-off-by: Alejandro Colomar <alx@kernel.org>
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Signed-off-by: Alejandro Colomar <alx@kernel.org>
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Signed-off-by: Alejandro Colomar <alx@kernel.org>
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Signed-off-by: Alejandro Colomar <alx@kernel.org>
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Signed-off-by: Alejandro Colomar <alx@kernel.org>
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Signed-off-by: Alejandro Colomar <alx@kernel.org>
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Signed-off-by: Alejandro Colomar <alx@kernel.org>
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Signed-off-by: Alejandro Colomar <alx@kernel.org>
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Signed-off-by: Alejandro Colomar <alx@kernel.org>
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Signed-off-by: Alejandro Colomar <alx@kernel.org>
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Signed-off-by: Alejandro Colomar <alx@kernel.org>
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Signed-off-by: Alejandro Colomar <alx@kernel.org>
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Signed-off-by: Alejandro Colomar <alx@kernel.org>
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Signed-off-by: Alejandro Colomar <alx@kernel.org>
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PCRE are EOL. Long live PCRE2.
Signed-off-by: Alejandro Colomar <alx@kernel.org>
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Signed-off-by: Alejandro Colomar <alx@kernel.org>
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This creates some false positives, but with appropriate flags, those can
be removed.
Signed-off-by: Alejandro Colomar <alx@kernel.org>
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of libc functions
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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To make -tu work correctly, which doesn't have the word-boundary
constraint.
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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In some cases it might be nice, but in some other cases, it might
cause a lot of code to be printed. Let the user explicitly search
for it or not in a separate run.
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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Avoid this glich from glibc:
./sysdeps/unix/sysv/linux/x86/sys/ucontext.h:133:
typedef struct
{
gregset_t __ctx(gregs);
/* Note that fpregs is a pointer. */
fpregset_t __ctx(fpregs);
__extension__ unsigned long long __reserved1 [8];
} mcontext_t;
/* Userlevel context. */
typedef struct ucontext_t
{
unsigned long int __ctx(uc_flags);
struct ucontext_t *uc_link;
stack_t uc_stack;
mcontext_t uc_mcontext;
sigset_t uc_sigmask;
struct _libc_fpstate __fpregs_mem;
__extension__ unsigned long long int __ssp[4];
} ucontext_t;
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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- Typedefs to arrays of structures.
- Typedefs to structures of the same name.
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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- Use the same ammount of spaces for the closing brace as for the
opening brace.
- Fix position of attributes.
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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SC2068: Double quote array expansions to avoid re-splitting elements.
Reported-by: shellcheck(1)
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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SC2124: Use $* instead of $@ to concatenate.
Reported-by: shellcheck(1)
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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SC2004: $/${} is unnecessary on arithmetic variables.
Reported-by: shellcheck(1)
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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Also, add some symmetry between ${iflag} and ${lflag}.
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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Normally, one either wants to see a declaration/definition, or its
uses, but not both at the same time. Also, there are usually many
more use sites than than definitions, and therefore definitions
are shadowed between all the noise. Restrict the default to
declarations and definitions, which in my experience seems to be
the most common use case.
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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When it calls grepc_type_struct_union_enum(), it needs to use a
different file list, since it's searching for an identifier
different from the one passed in the command line.
Also, while at it, improve the quoting of the pattern passed to
pcregrep(1).
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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Sort alphabetically the optstring.
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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Rename functions to have different starting letters. Also rename
the macro functions to more closely match ISO C nomenclature.
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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Most importantly, typedef enum.
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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Reported-by: наб <nabijaczleweli@nabijaczleweli.xyz>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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Use alphabetic order.
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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Improve grouping so that adding flags for running the different
functions is simple.
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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Also, update the manual page EXAMPLES regarding blank lines.
Reported-by: наб <nabijaczleweli@nabijaczleweli.xyz>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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Reported-by: наб <nabijaczleweli@nabijaczleweli.xyz>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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Using caps instead of <> will be nicer when we add options and
optional arguments for the files/directories:
Usage: grepc [OPTION]... IDENTIFIER [FILE]...
vs
Usage: grepc [<option>]... IDENTIFIER [<file>]...
Also, it's what pcregrep(1) and GNU grep(1) use, so it's good to
use the same syntax here.
Reported-by: наб <nabijaczleweli@nabijaczleweli.xyz>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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Reported-by: наб <nabijaczleweli@nabijaczleweli.xyz>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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Reported-by: наб <nabijaczleweli@nabijaczleweli.xyz>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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Let's fall on the safe side.
Reported-by: наб <nabijaczleweli@nabijaczleweli.xyz>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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Reported-by: наб <nabijaczleweli@nabijaczleweli.xyz>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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Reported-by: наб <nabijaczleweli@nabijaczleweli.xyz>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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Reported-by: наб <nabijaczleweli@nabijaczleweli.xyz>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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This improves the readability of the regex, and also the
robustness, at the cost of just a few ms.
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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Instead of running find and grep -l for every function, store the
result in a temporary file for reuse in all functions.
This is a considerable speedup, between 3x and 10x in some tests
within the Linux kernel source code.
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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Those two spaces are for handling some insane GNU style. Those
are always spaces, so let's use ' ' instead of '\s\s' to make
sure we don't match two tabs, or things like that.
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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Use 2 grep(1) filters instead of 1, to be able to filter better
before the multiline pcregrep(1) filter, which is considerably
slower.
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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positives
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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In definitions of the form
typedef struct foo {...} foo;
grepc_type_typedef_struct_union_enum() is already finding it.
Remove the duplicate here.
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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struct|union|enum keyword
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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In typedefs of the form 'typedef struct foo foo;', don't print the
structure twice.
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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If we use different regex types within the program, then users
can't use regex patterns in the identifier due to
incompatibilities. Let's use Perl regex everywhere we can, so
that users can consistently use Perl regex patterns in the
identifier. Example:
$ grepc (vf|as)printf;
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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Allow one single argument only.
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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Signed-off-by: Alejandro Colomar <alx@kernel.org>
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Signed-off-by: Alejandro Colomar <alx@kernel.org>
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Signed-off-by: Alejandro Colomar <alx@kernel.org>
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Signed-off-by: Alejandro Colomar <alx@kernel.org>
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Signed-off-by: Alejandro Colomar <alx@kernel.org>
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I forgot to do it right after releasing man-pages-6.15.
Signed-off-by: Alejandro Colomar <alx@kernel.org>
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Scripted change:
$ ~/src/linux/linux/v6.17/scripts/bpf_doc.py \
| rst2man \
>man7/bpf-helpers.7;
Signed-off-by: Alejandro Colomar <alx@kernel.org>
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This work is incomplete, but waiting until all pages have been updated
would unnecessarily delay publishing these changes, which are already
useful.
Signed-off-by: Alejandro Colomar <alx@kernel.org>
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This function was marked as legacy in POSIX.1-2001 and has been removed
from many systems, including glibc.
Signed-off-by: Collin Funk <collin.funk1@gmail.com>
Message-ID: <5924c3b09d8e373be6ac1b5ca663b8ad7d106d93.1750306917.git.collin.funk1@gmail.com>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
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As documented in the STANDARDS section, gettimeofday(2) was deprecated
in POSIX.1-2008 and removed in POSIX.1-2024. Mark it and
settimeofday(2) with [[deprecated]], and mention clock_settime(2) as a
modern and standardized alternative to settimeofday(2).
Signed-off-by: Collin Funk <collin.funk1@gmail.com>
Message-ID: <2d37d5a9251af3c1d25cf8e73e3585a9955d5772.1750373011.git.collin.funk1@gmail.com>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
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The FreeBSD implementation of ptsname_r(2) returns -1 on error and sets
errno, instead of just returning the errno. Document this issue for
programs written with portability in mind.
Signed-off-by: Collin Funk <collin.funk1@gmail.com>
Message-ID: <37f138bc5c5e6604f0a0afcc531694387d2cc424.1749792527.git.collin.funk1@gmail.com>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
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Signed-off-by: Alejandro Colomar <alx@kernel.org>
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Signed-off-by: Alejandro Colomar <alx@kernel.org>
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Signed-off-by: Alejandro Colomar <alx@kernel.org>
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Signed-off-by: Collin Funk <collin.funk1@gmail.com>
Message-ID: <2d55b75480ae862a622ac46e7e6c7628f6efc45d.1747519811.git.collin.funk1@gmail.com>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
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Signed-off-by: Collin Funk <collin.funk1@gmail.com>
Message-ID: <bae6bc16f9ab6bd3e5c30dc8e11bd83566b06a6f.1747519811.git.collin.funk1@gmail.com>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
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Signed-off-by: Collin Funk <collin.funk1@gmail.com>
Message-ID: <883d4a9b8cfb757a080710cf0133be5d0e12adce.1747515178.git.collin.funk1@gmail.com>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
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Signed-off-by: Alejandro Colomar <alx@kernel.org>
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Signed-off-by: Alejandro Colomar <alx@kernel.org>
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Signed-off-by: Alejandro Colomar <alx@kernel.org>
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Signed-off-by: Alejandro Colomar <alx@kernel.org>
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POSIX.1-2024 encourages implementations to disallow new-line characters,
but Linux doesn't follow that.
Signed-off-by: Alejandro Colomar <alx@kernel.org>
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POSIX.1-2024 now mandates a behavior different from what Linux (and many
other implementations) does. It requires that we report EINPROGRESS for
what now is EINTR.
There are no plans to conform to POSIX.1-2024 within the Linux kernel,
so document this divergence. Keep POSIX.1-2008 as the standard to
which we conform in STANDARDS.
Link: <https://sourceware.org/bugzilla/show_bug.cgi?id=14627>
Link: <https://pubs.opengroup.org/onlinepubs/9799919799/functions/close.html>
Cc: Jan Kara <jack@suse.cz>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Christian Brauner <brauner@kernel.org>
Cc: Rich Felker <dalias@libc.org>
Cc: <linux-fsdevel@vger.kernel.org>
Cc: <linux-api@vger.kernel.org>
Cc: <libc-alpha@sourceware.org>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
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Signed-off-by: Alejandro Colomar <alx@kernel.org>
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doesn't support it
Fixes: 265b9898dfe2 (2025-05-09; "man/man2/: VERSIONS: POSIX.1-2024 specifies *_CLOFORK, but Linux doesn't support it")
Link: <https://lore.kernel.org/all/20200515160342.GE23230@ZenIV.linux.org.uk/>
Cc: Mateusz Guzik <mjguzik@gmail.com>
Cc: Jeff Layton <jlayton@kernel.org>
Cc: Chuck Lever <chuck.lever@oracle.com>
Cc: <linux-fsdevel@vger.kernel.org>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
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Fixes: 4131356cdab8 (2023-03-30; "man*/, man-pages.7: VERSIONS, STANDARDS, HISTORY: Reorganize sections")
Signed-off-by: Alejandro Colomar <alx@kernel.org>
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Reported-by: Alejandro Colomar <alx@kernel.org>
Cc: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Suggested-by: "G. Branden Robinson" <g.branden.robinson@gmail.com>
Co-authored-by: "G. Branden Robinson" <g.branden.robinson@gmail.com>
Signed-off-by: "G. Branden Robinson" <g.branden.robinson@gmail.com>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
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Those flags were added in Linux 6.9 (see [1]), and are documented
in [2].
The text added is a modified version of [3], removing some repetition
and adapting from markdown to mandoc.
[1]: <https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=e1fb1dc08e73>
[2]: <https://github.com/brauner/man-pages-md/blob/main/pidfd_send_signal.md>
[3]: <https://github.com/brauner/man-pages-md/pull/2>
Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
Message-ID: <20251008020031.1215030-4-kolyshkin@gmail.com>
Cc: Christian Brauner <brauner@kernel.org>
Cc: Oleg Nesterov <oleg@redhat.com>
[alx: ffix]
Signed-off-by: Alejandro Colomar <alx@kernel.org>
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PIDFD_THREAD flag for pidfd_open(2) was added in Linux 6.9 (see [1]).
Add a TODO to describe the nuances of using poll/epoll/select
with a pidfd referring to a process vs a thread.
[1]: <https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=64bef697d33b>
Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
Message-ID: <20251013191049.193375-2-kolyshkin@gmail.com>
Cc: Christian Brauner <brauner@kernel.org>
Cc: Oleg Nesterov <oleg@redhat.com>
[alx: ffix]
Signed-off-by: Alejandro Colomar <alx@kernel.org>
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Document TCP_SAVE_SYN and TCP_SAVED_SYN options based on git commit
linux.git cd8ae85299d5 (2015-05-05; "tcp: provide SYN headers for
passive connections") which introduced it.
Link: <https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=cd8ae85299d54155702a56811b2e035e63064d3d>
Cc: Eric Dumazet <edumazet@google.com>
Signed-off-by: ValdikSS <iam@valdikss.org.ru>
Message-ID: <20251015214826.70750-1-iam@valdikss.org.ru>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
|
|
This behavior can be seen with the following example program:
$ cat main.c
#include <dirent.h>
#include <err.h>
#include <string.h>
#include <stdlib.h>
#include <sys/types.h>
int
main(int argc, char *argv[argc+1])
{
DIR *d;
if (argc < 2)
errx(EXIT_FAILURE, "argc < 2");
d = opendir(argv[1]);
if (d == NULL)
err(EXIT_FAILURE, "opendir");
closedir(d);
exit(EXIT_SUCCESS);
}
$ cc -Wall -Wextra main.c
$ ./a.out $(printf '%0999d')
a.out: opendir: File name too long
Signed-off-by: Collin Funk <collin.funk1@gmail.com>
Message-ID: <4266061219d7406c0aa737f8d52108fea7e0f7fb.1760689006.git.collin.funk1@gmail.com>
[jwilk: simpler reproducer]
Cc: Jakub Wilk <jwilk@jwilk.net>
[alx: Fix style in the reproducer program]
Signed-off-by: Alejandro Colomar <alx@kernel.org>
|
|
Rename uimaxabs(3) => umaxabs(3). And add a link page.
Keep a link with the old name, so that programmers looking for the old
name are redirected to the new name, so they find what they need.
I've removed documentation for uimaxabs(3), instead of keeping
information in HISTORY, as it has only existed for one glibc version,
to avoid programmers being confused by the old name.
Link: <https://www.open-std.org/jtc1/sc22/wg14/www/docs/n3577.txt>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
|
|
The "old" implementation led to priority inversion and was more or less
easy to trigger. It seems that after the rewrite the issue disappeared
especially since the old workaround does not apply anymore.
Add a note mentioning the old problem and why the issue is not gone
since the rewrite in glibc 2.25 but harder to trigger.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: André Almeida <andrealmeid@igalia.com>
Cc: Darren Hart <dvhart@infradead.org>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Juri Lelli <juri.lelli@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Valentin Schneider <vschneid@redhat.com>
Cc: Waiman Long <longman@redhat.com>
Message-ID: <20250915141305.906440-6-bigeasy@linutronix.de>
[alx: wfix, srcfix]
Signed-off-by: Alejandro Colomar <alx@kernel.org>
|
|
Carlos O'Donell says based on the context, it should be the former link
from that day.
Update the link accordingly.
Cc: Carlos O'Donell <carlos@redhat.com>
Link: <https://lore.kernel.org/all/710e8f05-b0b3-489a-9e89-8967cf6a9e70@redhat.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Message-ID: <20250915141305.906440-5-bigeasy@linutronix.de>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
|
|
The section refers to .txt files but they have been moved/ renamed to
.rst some time ago. The mentioned sched-rt-group is inconvenient as
people always complained about CONFIG_RT_GROUP_SCHED.
Everything that describes CFS is not wrong but the kernel the kernel
switched to the Earliest Virtual Deadline First (EEVDF) scheduler.
Instead of updating the file links below (and adding new ones), replace
them with a link to the automatically created scheduler documetation
from that folder. This also has some EEVDF bits. :)
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: André Almeida <andrealmeid@igalia.com>
Cc: Darren Hart <dvhart@infradead.org>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Juri Lelli <juri.lelli@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Valentin Schneider <vschneid@redhat.com>
Cc: Waiman Long <longman@redhat.com>
Message-ID: <20250915141305.906440-4-bigeasy@linutronix.de>
[alx: ffix]
Signed-off-by: Alejandro Colomar <alx@kernel.org>
|
|
Update the outdated information:
- The PREEMPT_RT patch is merged. The patch continues to exist (as of
now) but is not mandatory.
- The patch can be still downloaded but most people use the git tree
these days. Add a reference to it.
- CONFIG_PREEMPT_DESKTOP was never thing as far as I remember. It was
always CONFIG_PREEMPT and its description referred to "low latency
desktop".
- Within the PREEMPT-RT patch there was a brief window which introduced
PREEMPT_RT_BASE and PREEMPT_RT_FULL. I am going to ignore this.
- The introduction of PREEMPT_LAZY in 6.13 moved PREEMPT_RT from a
preemption model to an option.
- The mentioned wiki is deprecated. Update the URL to the new one.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: André Almeida <andrealmeid@igalia.com>
Cc: Darren Hart <dvhart@infradead.org>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Juri Lelli <juri.lelli@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Valentin Schneider <vschneid@redhat.com>
Cc: Waiman Long <longman@redhat.com>
Message-ID: <20250915141305.906440-3-bigeasy@linutronix.de>
[alx: minor tweaks]
Signed-off-by: Alejandro Colomar <alx@kernel.org>
|
|
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: André Almeida <andrealmeid@igalia.com>
Cc: Darren Hart <dvhart@infradead.org>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Juri Lelli <juri.lelli@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Valentin Schneider <vschneid@redhat.com>
Cc: Waiman Long <longman@redhat.com>
Message-ID: <20250915141305.906440-2-bigeasy@linutronix.de>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
|
|
Available since Linux 6.9 [1]. Documented in [2] (added by [3]).
[1]: <https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=83b290c9e3b5d95891f>
[2]: <https://github.com/brauner/man-pages-md/blob/main/clone.md>
[3]: <https://github.com/brauner/man-pages-md/pull/4>
Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
Message-ID: <20251008020031.1215030-2-kolyshkin@gmail.com>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
|
|
Add a brief explanation of the RTAX_* attributes that can be used in
RTA_METRICS.
Signed-off-by: Guillaume Nault <gnault@redhat.com>
Message-ID: <67e7f52aad3d777ef1075eca902d0d235e0d3753.1759950455.git.gnault@redhat.com>
[alx: ffix]
Signed-off-by: Alejandro Colomar <alx@kernel.org>
|
|
Move getc(3) to a separate manual page, documenting the bugs
of this API, and recommending fgetc(3) instead. While the
relevant standards (ISO C and POSIX) don't deprecate this
API, let's deprecate it here.
Cc: <onf@disroot.org>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
|
|
Stop meddling with adjustment.
A lengthy comment in groff's man(7) package explains why attempts to
meddle with text alignment and adjustment with the `ad` and `na`
requests--outside of tbl(1) text blocks--exhibits contempt for reader
preferences and often comes to grief anyway.
.\" Resetting the adjustment mode is a complicated dance.
.\" 1. Man pages sometimes disable adjustment--when they do, they
.\" often forget to put it back the way it was.
.\" 2. When they do remember to put it back, they often fail to do
.\" so correctly because of the `ad` request's quirky semantics
.\" starting from Seventh Edition Unix troff/nroff. Briefly, the
.\" `ad` request without arguments turns adjustment back on after
.\" an `na` even if the previous adjustment mode was `l` (align to
.\" the left with NO adjustment).
.\" 3. The default adjustment mode historically has not been
.\" predictable; it can depend on nroff vs. troff mode and on the
.\" vendor of the *roff system in use.
.\" 4. It's possible (and portable) to obtain the previous adjustment
.\" mode via the `.j` register so that it can be saved prior to
.\" meddling and restored later, but in practice man page authors
.\" neglect to do so.
.\" 5. groff man(7)'s `AD` string isn't supported everywhere.
.\" 6. We want user preferences, if expressed, to override the page
.\" author's.
.\" 7. Even if we didn't want (6), one page author's can override
.\" another's when formatting multiple man(7) documents in
.\" sequence[.]
Signed-off-by: "G. Branden Robinson" <g.branden.robinson@gmail.com>
Message-ID: <20251009215811.3a6ughmxcskgae3s@illithid>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
|
|
Add missing `x` column modifier to the descriptive column of the "VT100
console sequences not implemented on the Linux console" table, making it
format like all the other tables in this man page.
Signed-off-by: "G. Branden Robinson" <g.branden.robinson@gmail.com>
Message-ID: <20251009215801.yt57b4zbpsvctl5h@illithid>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
|
|
Spell out column heading as "parmeter"; "param" is a false economy given
that one of the entries in the same column is "100..107" (only one en
shorter).
Signed-off-by: "G. Branden Robinson" <g.branden.robinson@gmail.com>
Message-ID: <20251009215752.upezzr4gubzveiwe@illithid>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
|
|
Use a more idiomatic means (than numeral-width horizontal motion escape
sequences `\0`) of setting table entries that are indented with respect
to other entries in the same column.
Use table region continuation (`.T&`) and the `A` column classifier.
See tbl(1).
Signed-off-by: "G. Branden Robinson" <g.branden.robinson@gmail.com>
Message-ID: <20251009215742.w44sai53jje46m6h@illithid>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
|
|
Put lengthy table entries into tbl(1) text blocks, so that they don't
cause output lines to overset.
Signed-off-by: "G. Branden Robinson" <g.branden.robinson@gmail.com>
Message-ID: <20251009215733.k3dgj5mafiysxa7z@illithid>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
|
|
Consistently put inter-paragraph space before tables.
Signed-off-by: "G. Branden Robinson" <g.branden.robinson@gmail.com>
Message-ID: <20251009215724.7gms7w7zosrlg44n@illithid>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
|
|
extension controls.
Link: <https://invisible-island.net/xterm/ctlseqs/ctlseqs.html#h3-Functions-using-CSI-_-ordered-by-the-final-character_s_>
Signed-off-by: "G. Branden Robinson" <g.branden.robinson@gmail.com>
Message-ID: <20251009215712.zhmxvmbtx72tk4yg@illithid>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
|
|
Message-ID: <20250925135215.1648059-1-kele@cs.columbia.edu>
Acked-by: "G. Branden Robinson" <branden@debian.org>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
|
|
CAP_SYS_PTRACE is required (via ptrace_may_access) for accessing various
things in /proc, so include it in the CAP_SYS_PTRACE bullet list.
Also, add a hint that other things throughout the kernel may check this
via ptrace_may_access().
Signed-off-by: Jonathon Reinhart <jrreinhart@google.com>
Message-ID: <20250924152313.1902586-1-jrreinhart@google.com>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
|
|
Use the dummy character to avoid a table entry consisting only of '=',
which would be interpreted as a table delimiter. We previously had
a white space, but that was worse: it is not visible in the input, and
produces non-ignorable output.
Signed-off-by: Alejandro Colomar <alx@kernel.org>
|
|
Remove spaces before a tab (except in a few cases).
Reported-by: "G. Branden Robinson" <branden@debian.org>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
|
|
Also remove it from "share/mk/build/catman/troff.xfail", as it doesn't
fail anymore.
Suggested-by: "G. Branden Robinson" <branden@debian.org>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
|
|
It was forcing some entries to go past the right margin.
Signed-off-by: Alejandro Colomar <alx@kernel.org>
|
|
Reported-by: Bjarni Ingi Gislason <bjarniig@simnet.is>
Suggested-by: "G. Branden Robinson" <branden@debian.org>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
|
|
Back in 2019, the new mount API was merged[1]. David Howells then set
about writing man pages for these new APIs, and sent some patches back
in 2020[2].
Unfortunately, these patches were never merged, which meant that these
APIs were practically undocumented for many years -- arguably this has
been a contributing factor to the relatively slow adoption of these new
(far better) APIs. For instance, I have often discovered that many
folks are unaware of the read(2)-based message retrieval interface
provided by filesystem context file descriptors.
In 2024, Christian Brauner adapted David Howell's original man pages
into the easier-to-edit Markdown format and published them on GitHub[3].
These have been maintained since, including updated information on new
features added since David Howells's 2020 draft pages (such as
MOVE_MOUNT_BENEATH).
While this was a welcome improvement to the previous status quo (that
had lasted over 6 years), speaking personally my experience is that not
having access to these man pages from the terminal has been a fairly
common painpoint.
So, this is a modern version of the man pages for these APIs, in the
hopes that we can finally (6 years later) get proper documentation for
these APIs in the man-pages project.
One important thing to note is that most of these were re-written by me,
with very minimal copying from the versions available from Christian[2].
The reasons for this are two-fold:
- Both Howells's original version and Christian's maintained versions
contain crucial mistakes that I have been bitten by in the past (the
most obvious being that all of these APIs were merged in Linux 5.2,
but the man pages all claim they were merged in different versions.)
- As the man pages appear to have been written from Howells's
perspective while implementing them, some of the wording is a little
too tied to the implementation (or appears to describe features that
don't really exist in the merged versions of these APIs).
- The original versions of the man-pages lacked bigger-picture
explanations of the reasoning behind the API, which would make it
easier for readers to understand what operations are doing.
I decided that the best way to resolve these issues is to rewrite them
from the perspective of an actual user of these APIs (me), and check
that we do not repeat the mistakes I found in the originals. I have
also done my best to resolve the issues raised by Michael Kerrisk on the
original patchset sent by Howells[1].
In addition, I have also included a man page for open_tree_attr(2) (as a
subsection of the new open_tree(2) man page), which was merged in Linux
6.15.
[1]: <https://lore.kernel.org/all/20190507204921.GL23075@ZenIV.linux.org.uk/>
[2]: <https://lore.kernel.org/linux-man/159680892602.29015.6551860260436544999.stgit@warthog.procyon.org.uk/>
[3]: <https://github.com/brauner/man-pages-md>
Co-authored-by: David Howells <dhowells@redhat.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Co-authored-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Aleksa Sarai <cyphar@cyphar.com>
Message-Id: <20250925-new-mount-api-v5-0-028fb88023f2@cyphar.com>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
|
|
attribute-parameter distinction
This was not particularly well documented in mount(8) nor mount(2), and
since this is a fairly notable aspect of the new mount API, we should
probably add some words about it.
Signed-off-by: Aleksa Sarai <cyphar@cyphar.com>
Message-ID: <20250925-new-mount-api-v5-8-028fb88023f2@cyphar.com>
Reviewed-by: Askar Safin <safinaskar@gmail.com>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
|
|
This is a new API added in Linux 6.15, and is effectively just a minor
expansion of open_tree(2) in order to allow for MOUNT_ATTR_IDMAP to be
changed for an existing ID-mapped mount. glibc does not yet have a
wrapper for this.
While working on this man-page, I discovered a bug in open_tree_attr(2)
that accidentally permitted changing MOUNT_ATTR_IDMAP for extant
detached ID-mapped mount objects. This is definitely a bug, but there
is no need to add this to BUGS because the patch to fix this has already
been accepted (slated for 6.18, and will be backported to 6.15+).
Cc: Christian Brauner <brauner@kernel.org>
Signed-off-by: Aleksa Sarai <cyphar@cyphar.com>
Message-ID: <20250925-new-mount-api-v5-7-028fb88023f2@cyphar.com>
Reviewed-by: Askar Safin <safinaskar@gmail.com>
[alx: amend some examples: s/open_tree/&_attr/]
Signed-off-by: Alejandro Colomar <alx@kernel.org>
|
|
This is loosely based on the original documentation written by David
Howells and later maintained by Christian Brauner, but has been
rewritten to be more from a user perspective (as well as fixing a few
critical mistakes).
Co-authored-by: David Howells <dhowells@redhat.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Co-authored-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Aleksa Sarai <cyphar@cyphar.com>
Message-ID: <20250925-new-mount-api-v5-6-028fb88023f2@cyphar.com>
Reviewed-by: Askar Safin <safinaskar@gmail.com>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
|
|
This is loosely based on the original documentation written by David
Howells and later maintained by Christian Brauner, but has been
rewritten to be more from a user perspective (as well as fixing a few
critical mistakes).
Co-authored-by: David Howells <dhowells@redhat.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Co-authored-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Aleksa Sarai <cyphar@cyphar.com>
Message-ID: <20250925-new-mount-api-v5-5-028fb88023f2@cyphar.com>
Reviewed-by: Askar Safin <safinaskar@gmail.com>
[alx: ffix]
Signed-off-by: Alejandro Colomar <alx@kernel.org>
|
|
This is loosely based on the original documentation written by David
Howells and later maintained by Christian Brauner, but has been
rewritten to be more from a user perspective (as well as fixing a few
critical mistakes).
Co-authored-by: David Howells <dhowells@redhat.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Co-authored-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Aleksa Sarai <cyphar@cyphar.com>
Message-ID: <20250925-new-mount-api-v5-4-028fb88023f2@cyphar.com>
Reviewed-by: Askar Safin <safinaskar@gmail.com>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
|
|
This is loosely based on the original documentation written by David
Howells and later maintained by Christian Brauner, but has been
rewritten to be more from a user perspective (as well as fixing a few
critical mistakes).
Co-authored-by: David Howells <dhowells@redhat.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Co-authored-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Aleksa Sarai <cyphar@cyphar.com>
Message-ID: <20250925-new-mount-api-v5-3-028fb88023f2@cyphar.com>
Reviewed-by: Askar Safin <safinaskar@gmail.com>
[alx: s/name/key/; ffix]
Signed-off-by: Alejandro Colomar <alx@kernel.org>
|
|
This is loosely based on the original documentation written by David
Howells and later maintained by Christian Brauner, but has been
rewritten to be more from a user perspective (as well as fixing a few
critical mistakes).
Co-authored-by: David Howells <dhowells@redhat.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Co-authored-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Aleksa Sarai <cyphar@cyphar.com>
Message-ID: <20250925-new-mount-api-v5-2-028fb88023f2@cyphar.com>
Reviewed-by: Askar Safin <safinaskar@gmail.com>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
|
|
This is loosely based on the original documentation written by David
Howells and later maintained by Christian Brauner, but has been
rewritten to be more from a user perspective (as well as fixing a few
critical mistakes).
Co-authored-by: David Howells <dhowells@redhat.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Co-authored-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Aleksa Sarai <cyphar@cyphar.com>
Message-ID: <20250925-new-mount-api-v5-1-028fb88023f2@cyphar.com>
Reviewed-by: Askar Safin <safinaskar@gmail.com>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
|
|
Message-ID: <3589b9717dacf9e21bea9317da0840ad9095d7f1.1758570745.git.git@hypodyne.net>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
|
|
Signed-off-by: Kele Huang <kele@cs.columbia.edu>
Message-ID: <20250922035934.446271-6-kele@cs.columbia.edu>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
|
|
Signed-off-by: Kele Huang <kele@cs.columbia.edu>
Message-ID: <20250922035934.446271-5-kele@cs.columbia.edu>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
|
|
Signed-off-by: Kele Huang <kele@cs.columbia.edu>
Message-ID: <20250922035934.446271-4-kele@cs.columbia.edu>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
|
|
Signed-off-by: Kele Huang <kele@cs.columbia.edu>
Message-ID: <20250922035934.446271-3-kele@cs.columbia.edu>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
|
|
Signed-off-by: Kele Huang <kele@cs.columbia.edu>
Message-ID: <20250922035934.446271-2-kele@cs.columbia.edu>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
|
|
Most of these have been reported by 'make lint-man-dash'. A couple of
them were found manually.
Signed-off-by: Alejandro Colomar <alx@kernel.org>
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Signed-off-by: Alejandro Colomar <alx@kernel.org>
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This is too common, and I don't see a solution in many cases.
Signed-off-by: Alejandro Colomar <alx@kernel.org>
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Reported-by: Peter Xu <peterx@redhat.com>
[gbr: style fixes]
Cc: "G. Branden Robinson" <g.branden.robinson@gmail.com>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
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And fix related issues while at it.
Silence false positives with \&.
Reported-by: `make lint-man-semnl`
Signed-off-by: Alejandro Colomar <alx@kernel.org>
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pcre2grep(1) doesn't have a -T flag, so we need to script a bit to do
something similar.
Signed-off-by: Alejandro Colomar <alx@kernel.org>
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Signed-off-by: Alejandro Colomar <alx@kernel.org>
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Write poems, not prose.
This only catches the most obvious issues, but at least that's
something.
We need pcre2grep(3) because it allows multiple patterns, whereas
grep(1) in -P mode only accepts one.
Signed-off-by: Alejandro Colomar <alx@kernel.org>
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This will be used for adding diagnostics about semantic newlines.
Signed-off-by: Alejandro Colomar <alx@kernel.org>
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All of the other new mount API docs have this lead-in sentence in order
to make this set of APIs feel a little bit more cohesive. Despite being
a bit of a latecomer, mount_setattr(2) is definitely part of this family
of APIs and so deserves the same treatment.
Signed-off-by: Aleksa Sarai <cyphar@cyphar.com>
Message-ID: <20250919-new-mount-api-v4-8-1261201ab562@cyphar.com>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
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Clang doesn't know [[gnu::nonnull]].
Signed-off-by: Alejandro Colomar <alx@kernel.org>
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This silences -Wunterminated-string-initialization.
Signed-off-by: Alejandro Colomar <alx@kernel.org>
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Signed-off-by: Alejandro Colomar <alx@kernel.org>
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This silences -Wunused-parameter.
Signed-off-by: Alejandro Colomar <alx@kernel.org>
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Signed-off-by: Alejandro Colomar <alx@kernel.org>
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Link: <https://www.open-std.org/jtc1/sc22/wg14/www/docs/n3611.txt>
Link: <https://gitweb.git.savannah.gnu.org/gitweb/?p=gnulib.git;a=commit;h=60b0949c939013bd8275fd9e6227014096d7c264>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
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Link: <https://www.open-std.org/jtc1/sc22/wg14/www/docs/n3617.txt>
Link: <https://gitweb.git.savannah.gnu.org/gitweb/?p=gnulib.git;a=commit;h=60b0949c939013bd8275fd9e6227014096d7c264>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
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