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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
incompatible System V version of this function, 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)
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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