SIGPAUSE(3) Linux Programmer's Manual SIGPAUSE(3)
sigpause - atomically release blocked signals and wait for interrupt
int sigpause(int sigmask); /* BSD */
int sigpause(int sig); /* System V / Unix95 */
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.
If sigpause() returns, it was interrupted by a signal and the return
value is -1 with errno set to EINTR.
The System V version of sigpause() is standardized in POSIX.1-2001.
The classical BSD version of this function appeared in 4.2BSD. It sets
the process's signal mask to sigmask. Unix95 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 sigset_t * argument (instead
of an int).
On Linux, this routine is a system call only on the Sparc (sparc64)
Libc4 and libc5 only know about the BSD version.
Glibc uses the BSD version if the _BSD_SOURCE feature test macro is
defined and none of _POSIX_SOURCE, _POSIX_C_SOURCE, _XOPEN_SOURCE,
_GNU_SOURCE, or _SVID_SOURCE is defined. The System V version is used
if _XOPEN_SOURCE is defined.
kill(2), sigaction(2), sigprocmask(2), sigsuspend(2), sigblock(3),
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Linux 2005-12-01 SIGPAUSE(3)