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| -rw-r--r-- | man3/sigpause.3 | 126 |
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diff --git a/man3/sigpause.3 b/man3/sigpause.3 new file mode 100644 index 0000000..492d9fa --- /dev/null +++ b/man3/sigpause.3 @@ -0,0 +1,126 @@ +'\" t +.\" Copyright (C) 2004 Andries Brouwer (aeb@cwi.nl) +.\" +.\" SPDX-License-Identifier: Linux-man-pages-copyleft +.\" +.TH sigpause 3 2023-07-20 "Linux man-pages 6.05.01" +.SH NAME +sigpause \- atomically release blocked signals and wait for interrupt +.SH LIBRARY +Standard C library +.RI ( libc ", " \-lc ) +.SH SYNOPSIS +.nf +.B #include <signal.h> +.PP +.BI "[[deprecated]] int sigpause(int " sigmask "); /* BSD (but see NOTES) */" +.PP +.BI "[[deprecated]] int sigpause(int " sig "); /* POSIX.1 / SysV / UNIX 95 */" +.fi +.SH DESCRIPTION +Don't use this function. +Use +.BR sigsuspend (2) +instead. +.PP +The function +.BR sigpause () +is designed to wait for some signal. +It changes the process's signal mask (set of blocked signals), +and then waits for a signal to arrive. +Upon arrival of a signal, the original signal mask is restored. +.SH RETURN VALUE +If +.BR sigpause () +returns, it was interrupted by a signal and the return value is \-1 +with +.I errno +set to +.BR EINTR . +.SH ATTRIBUTES +For an explanation of the terms used in this section, see +.BR attributes (7). +.TS +allbox; +lbx lb lb +l l l. +Interface Attribute Value +T{ +.na +.nh +.BR sigpause () +T} Thread safety MT-Safe +.TE +.sp 1 +.\" FIXME: The marking is different from that in the glibc manual, +.\" marking in glibc manual is more detailed: +.\" +.\" sigpause: MT-Unsafe race:sigprocmask/!bsd!linux +.\" +.\" glibc manual says /!linux!bsd indicate the preceding marker only applies +.\" when the underlying kernel is neither Linux nor a BSD kernel. +.\" So, it is safe in Linux kernel. +.SH VERSIONS +On Linux, this routine is a system call only on the Sparc (sparc64) +architecture. +.PP +.\" Libc4 and libc5 know only about the BSD version. +.\" +glibc uses the BSD version if the +.B _BSD_SOURCE +feature test macro is defined and none of +.BR _POSIX_SOURCE , +.BR _POSIX_C_SOURCE , +.BR _XOPEN_SOURCE , +.BR _GNU_SOURCE , +or +.B _SVID_SOURCE +is defined. +Otherwise, the System V version is used, +and feature test macros must be defined as follows to obtain the declaration: +.IP \[bu] 3 +Since glibc 2.26: +_XOPEN_SOURCE >= 500 +.\" || (_XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED) +.IP \[bu] +glibc 2.25 and earlier: _XOPEN_SOURCE +.PP +Since glibc 2.19, only the System V version is exposed by +.IR <signal.h> ; +applications that formerly used the BSD +.BR sigpause () +should be amended to use +.BR sigsuspend (2). +.\" +.\" For the BSD version, one usually uses a zero +.\" .I sigmask +.\" to indicate that no signals are to be blocked. +.SH STANDARDS +POSIX.1-2008. +.SH HISTORY +POSIX.1-2001. +Obsoleted in POSIX.1-2008. +.PP +The classical BSD version of this function appeared in 4.2BSD. +It sets the process's signal mask to +.IR sigmask . +UNIX 95 standardized the incompatible System V version of +this function, which removes only the specified signal +.I sig +from the process's signal mask. +.\" __xpg_sigpause: UNIX 95, spec 1170, SVID, SVr4, XPG +The unfortunate situation with two incompatible functions with the +same name was solved by the +.BR \%sigsuspend (2) +function, that takes a +.I "sigset_t\ *" +argument (instead of an +.IR int ). +.SH SEE ALSO +.BR kill (2), +.BR sigaction (2), +.BR sigprocmask (2), +.BR sigsuspend (2), +.BR sigblock (3), +.BR sigvec (3), +.BR feature_test_macros (7) |