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| author | Alejandro Colomar <alx@kernel.org> | 2023-03-17 17:08:01 +0100 |
|---|---|---|
| committer | Alejandro Colomar <alx@kernel.org> | 2023-03-30 15:14:55 +0200 |
| commit | 4131356cdab8d37fc395ca5466a0401c8573380c (patch) | |
| tree | 8c4c6f1c3172358b735b481cbbfdd9cc04b00ed9 /man2/sigwaitinfo.2 | |
| parent | fd00f831b52d61a91d59cb3b46182869145d9700 (diff) | |
| download | man-pages-4131356cdab8.tar.gz | |
man*/, man-pages.7: VERSIONS, STANDARDS, HISTORY: Reorganize sections
- Add a new HISTORY section that covers the history of an API, both
regarding implementations and regarding old standards. This was
previously covered in VERSIONS, and in some cases in STANDARDS.
- Repurpose VERSIONS to cover differing implementations in _current_
systems.
- STANDARDS is reduced to only cover current versions of standards.
That basically means only C11 (C99 has been superseeded by C11; C17
is just a bugfix of C11, so not really a new version), and
POSIX.1-2008 (*-2001 was superseeded by *-2008; *-2017 was just a
bugfix for *-2008). The section also mentions for example 'Linux',
'GNU' or 'BSD' when a non-standard API is Linux- or GNU-only or if
it's (de-facto) standard in the BSDs.
- In some cases content that should go into one of these sections was
in NOTES. Move it from there to where it corresponds.
- In the SYNOPSIS, I added [[deprecated]] in some functions that I
found are deprecated by the relevant standards.
- A few other related changes...
Cc: Oskari Pirhonen <xxc3ncoredxx@gmail.com>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
Diffstat (limited to 'man2/sigwaitinfo.2')
| -rw-r--r-- | man2/sigwaitinfo.2 | 90 |
1 files changed, 46 insertions, 44 deletions
diff --git a/man2/sigwaitinfo.2 b/man2/sigwaitinfo.2 index 42209c1806..fb797e8036 100644 --- a/man2/sigwaitinfo.2 +++ b/man2/sigwaitinfo.2 @@ -110,8 +110,53 @@ The wait was interrupted by a signal handler; see .B EINVAL .I timeout was invalid. +.SH VERSIONS +.SS C library/kernel differences +On Linux, +.BR sigwaitinfo () +is a library function implemented on top of +.BR sigtimedwait (). +.PP +The glibc wrapper functions for +.BR sigwaitinfo () +and +.BR sigtimedwait () +silently ignore attempts to wait for the two real-time signals that +are used internally by the NPTL threading implementation. +See +.BR nptl (7) +for details. +.PP +The original Linux system call was named +.BR sigtimedwait (). +However, with the addition of real-time signals in Linux 2.2, +the fixed-size, 32-bit +.I sigset_t +type supported by that system call was no longer fit for purpose. +Consequently, a new system call, +.BR rt_sigtimedwait (), +was added to support an enlarged +.I sigset_t +type. +The new system call takes a fourth argument, +.IR "size_t sigsetsize" , +which specifies the size in bytes of the signal set in +.IR set . +This argument is currently required to have the value +.I sizeof(sigset_t) +(or the error +.B EINVAL +results). +The glibc +.BR sigtimedwait () +wrapper function hides these details from us, transparently calling +.BR rt_sigtimedwait () +when the kernel provides it. +.\" .SH STANDARDS -POSIX.1-2001, POSIX.1-2008. +POSIX.1-2008. +.SH HISTORY +POSIX.1-2001. .SH NOTES In normal usage, the calling program blocks the signals in .I set @@ -171,49 +216,6 @@ unspecified, permitting the possibility that this has the same meaning as a call to .BR sigwaitinfo (), and indeed this is what is done on Linux. -.\" -.SS C library/kernel differences -On Linux, -.BR sigwaitinfo () -is a library function implemented on top of -.BR sigtimedwait (). -.PP -The glibc wrapper functions for -.BR sigwaitinfo () -and -.BR sigtimedwait () -silently ignore attempts to wait for the two real-time signals that -are used internally by the NPTL threading implementation. -See -.BR nptl (7) -for details. -.PP -The original Linux system call was named -.BR sigtimedwait (). -However, with the addition of real-time signals in Linux 2.2, -the fixed-size, 32-bit -.I sigset_t -type supported by that system call was no longer fit for purpose. -Consequently, a new system call, -.BR rt_sigtimedwait (), -was added to support an enlarged -.I sigset_t -type. -The new system call takes a fourth argument, -.IR "size_t sigsetsize" , -which specifies the size in bytes of the signal set in -.IR set . -This argument is currently required to have the value -.I sizeof(sigset_t) -(or the error -.B EINVAL -results). -The glibc -.BR sigtimedwait () -wrapper function hides these details from us, transparently calling -.BR rt_sigtimedwait () -when the kernel provides it. -.\" .SH SEE ALSO .BR kill (2), .BR sigaction (2), |