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 / UNIX 95 */
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 sig-
nal mask to sigmask. UNIX 95 standardized the incompatible System V version of this func-
tion, which removes only the specified signal sig from the process's signal mask. The
unfortunate situation 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) architecture.
Libc4 and libc5 know only 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.
Otherwise, the System V version is used.
kill(2), sigaction(2), sigprocmask(2), sigsuspend(2), sigblock(3), sigvec(3), fea-
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Linux 2010-09-12 SIGPAUSE(3)