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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | ATTRIBUTES | VERSIONS | STANDARDS | SEE ALSO | COLOPHON |
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sysv_signal(3) Library Functions Manual sysv_signal(3)
sysv_signal - signal handling with System V semantics
Standard C library (libc, -lc)
#define _GNU_SOURCE /* See feature_test_macros(7) */
#include <signal.h>
typedef typeof(void (int)) *sighandler_t;
sighandler_t sysv_signal(int signum, sighandler_t handler);
The sysv_signal() function takes the same arguments, and performs
the same task, as signal(2).
However sysv_signal() provides the System V unreliable signal
semantics, that is: a) the disposition of the signal is reset to
the default when the handler is invoked; b) delivery of further
instances of the signal is not blocked while the signal handler is
executing; and c) if the handler interrupts (certain) blocking
system calls, then the system call is not automatically restarted.
The sysv_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).
┌──────────────────────────────────────┬───────────────┬─────────┐
│ Interface │ Attribute │ Value │
├──────────────────────────────────────┼───────────────┼─────────┤
│ sysv_signal() │ Thread safety │ MT-Safe │
└──────────────────────────────────────┴───────────────┴─────────┘
Use of sysv_signal() should be avoided; use sigaction(2) instead.
On older Linux systems, sysv_signal() and signal(2) were
equivalent. But on newer systems, signal(2) provides reliable
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.
sigaction(2), signal(2), bsd_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
⟨https://www.kernel.org/doc/man-pages/⟩. If you have a bug report
for this manual page, see
⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
This page was obtained from the tarball man-pages-6.10.tar.gz
fetched from
⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
2025-02-02. 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 6.10 2024-12-13 sysv_signal(3)
Pages that refer to this page: signal(2), bsd_signal(3), signal(7)
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HTML rendering created 2025-02-02 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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