NAME
sigpause - atomically release blocked signals and wait for interrupt SYNOPSIS
#include
int sigpause(int sigmask); /* BSD */ int sigpause(int sig); /* System V / UNIX 95 */ DESCRIPTION Don't use this function. Use sigsuspend(2) instead. The function 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. RETURN VALUE If sigpause() returns, it was interrupted by a signal and the return value is -1 with errno set to EINTR. ATTRIBUTES For an explanation of the terms used in this section, see attributes(7). ┌───────────┬───────────────┬─────────┐ │Interface │ Attribute │ Value │ ├───────────┼───────────────┼─────────┤
│sigpause() │ Thread safety │ MT-Safe │ └───────────┴───────────────┴─────────┘ CONFORMING TO
The System V version of sigpause() is standardized in POSIX.1-2001. NOTES History The classical BSD version of this function appeared in 4.2BSD. It sets the process's signal mask to sigmask. UNIX 95 standardized the incom‐ patible System V version of this function, which removes only the spec‐ ified signal sig from the process's signal mask. The unfortunate situ‐ ation with two incompatible functions with the same name was solved by the sigsuspend(2) function, that takes a sigsett * argument (instead of an int). Linux notes On Linux, this routine is a system call only on the Sparc (sparc64) architecture. Libc4 and libc5 know only about the BSD version. Glibc uses the BSD version if the BSDSOURCE feature test macro is defined and none of POSIXSOURCE, POSIXCSOURCE, XOPENSOURCE, GNUSOURCE, or SVIDSOURCE is defined. Otherwise, the System V ver‐ sion is used. SEE ALSO kill(2), sigaction(2), sigprocmask(2), sigsuspend(2), sigblock(3), sigvec(3), featuretestmacros(7) COLOPHON
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Linux 2010-09-12 SIGPAUSE(3)