SIGPAUSESection: Linux Programmer's Manual (3)
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NAMEsigpause - atomically release blocked signals and wait for interrupt
#include <signal.h> int sigpause(int sigmask); /* BSD */ int sigpause(int sig); /* System V / Unix95 */
DESCRIPTIONDon'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 VALUEIf sigpause() returns, it was interrupted by a signal and the return value is -1 with errno set to EINTR.
CONFORMING TOThe System V version of sigpause() is standardized in POSIX.1-2001.
HistoryThe 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).
Linux NotesOn 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. The System V version is used if _XOPEN_SOURCE is defined.
SEE ALSOkill(2), sigaction(2), sigprocmask(2), sigsuspend(2), sigblock(3), sigvec(3), feature_test_macros(7)
COLOPHONThis page is part of release 3.21 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.