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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | ATTRIBUTES | VERSIONS | STANDARDS | HISTORY | SEE ALSO | COLOPHON |
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bsd_signal(3) Library Functions Manual bsd_signal(3)
bsd_signal - signal handling with BSD semantics
Standard C library (libc, -lc)
#include <signal.h>
typedef typeof(void (int)) *sighandler_t;
sighandler_t bsd_signal(int signum, sighandler_t handler);
Feature Test Macro Requirements for glibc (see
feature_test_macros(7)):
bsd_signal():
Since glibc 2.26:
_XOPEN_SOURCE >= 500
&& ! (_POSIX_C_SOURCE >= 200809L)
glibc 2.25 and earlier:
_XOPEN_SOURCE
The bsd_signal() function takes the same arguments, and performs
the same task, as signal(2).
The difference between the two is that bsd_signal() is guaranteed
to provide reliable signal semantics, that is: a) the disposition
of the signal is not reset to the default when the handler is
invoked; b) delivery of further instances of the signal is blocked
while the signal handler is executing; and c) if the handler
interrupts a blocking system call, then the system call is
automatically restarted. A portable application cannot rely on
signal(2) to provide these guarantees.
The bsd_signal() function returns the previous value of the signal
handler, or SIG_ERR on error.
As for signal(2).
For an explanation of the terms used in this section, see
attributes(7).
โโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโฌโโโโโโโโโโโโโโโโฌโโโโโโโโโโ
โ Interface โ Attribute โ Value โ
โโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโผโโโโโโโโโโโโโโโโผโโโโโโโโโโค
โ bsd_signal() โ Thread safety โ MT-Safe โ
โโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโดโโโโโโโโโโโโโโโโดโโโโโโโโโโ
Use of bsd_signal() should be avoided; use sigaction(2) instead.
On modern Linux systems, bsd_signal() and signal(2) are
equivalent. But on older systems, signal(2) provided unreliable
signal semantics; see signal(2) for details.
The use of sighandler_t is a GNU extension; this type is defined
only if the _GNU_SOURCE feature test macro is defined.
None.
4.2BSD, POSIX.1-2001. Removed in POSIX.1-2008, recommending the
use of sigaction(2) instead.
sigaction(2), signal(2), sysv_signal(3), signal(7)
This page is part of the man-pages (Linux kernel and C library
user-space interface documentation) project. Information about
the project can be found at
โจhttps://www.kernel.org/doc/man-pages/โฉ. If you have a bug report
for this manual page, see
โจhttps://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTINGโฉ.
This page was obtained from the tarball man-pages-6.18.tar.gz
fetched from
โจhttps://mirrors.edge.kernel.org/pub/linux/docs/man-pages/โฉ on
2026-05-24. If you discover any rendering problems in this HTML
version of the page, or you believe there is a better or more up-
to-date source for the page, or you have corrections or
improvements to the information in this COLOPHON (which is not
part of the original manual page), send a mail to
man-pages@man7.org
Linux man-pages 6.18 2026-02-08 bsd_signal(3)
Pages that refer to this page: signal(2), sysv_signal(3), signal(7)
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HTML rendering created 2026-05-30 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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