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SIGPAUSE(3) - man page online | library functions

Atomically release blocked signals and wait for interrupt.

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2015-08-08
SIGPAUSE(3)                         Linux Programmer's Manual                         SIGPAUSE(3)

NAME sigpause - atomically release blocked signals and wait for interrupt
SYNOPSIS #include <signal.h> int sigpause(int sigmask); /* BSD (but see NOTES) */ int sigpause(int sig); /* System V / UNIX 95 */
DESCRIPTION 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.
RETURN VALUE If sigpause() returns, it was interrupted by a signal and the return value is -1 with errno set to EINTR.
ATTRIBUTES For an explanation of the terms used in this section, see attributes(7). ┌───────────┬───────────────┬─────────┐ │Interface │ Attribute │ Value │ ├───────────┼───────────────┼─────────┤ │sigpause() │ Thread safety │ MT-Safe │ └───────────┴───────────────┴─────────┘
CONFORMING TO The System V version of sigpause() is standardized in POSIX.1-2001. It is also specified in POSIX.1-2008, where it is marked obsolete.
NOTES History 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). Linux notes On Linux, this routine is a system call only on the Sparc (sparc64) architecture. 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 (and _XOPEN_SOURCE must be defined to obtain the declaration). Since glibc 2.19, only the System V version is exposed by <signal.h>; applications that formerly used the BSD sigpause() should be amended to use sigsuspend(2).
SEE ALSO kill(2), sigaction(2), sigprocmask(2), sigsuspend(2), sigblock(3), sigvec(3), fea‐ ture_test_macros(7)
COLOPHON This page is part of release 4.04 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at http://www.kernel.org/doc/man-pages/.
Linux 2015-08-08 SIGPAUSE(3)
This manual Reference Other manuals
sigpause(3) referred by sigset(3) | sigvec(3)
refer to attributes(7) | kill(2) | sigaction(2) | sigprocmask(2) | sigsuspend(2) | sigvec(3)