sigpause - atomically release blocked signals and wait for interrupt
int sigpause(int sigmask); /* BSD */
int sigpause(int sig); /* System V / UNIX 95 */
Dont use this function. Use sigsuspend(2) instead.
The function sigpause() is designed to wait for some signal. It changes the processs 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 processs signal mask to sigmask. UNIX 95 standardized the incompatible System V version of this function, which removes only the specified signal sig from the processs 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 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. Otherwise, the System V version is used.
kill(2), sigaction(2), sigprocmask(2), sigsuspend(2), sigblock(3), sigvec(3), feature_test_macros(7)
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