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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | ATTRIBUTES | STANDARDS | HISTORY | SEE ALSO | COLOPHON |
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gsignal(3) Library Functions Manual gsignal(3)
gsignal, ssignal - software signal facility
Standard C library (libc, -lc)
#include <signal.h>
typedef typeof(void (int)) *sighandler_t;
[[deprecated]] int gsignal(int signum);
[[deprecated]] sighandler_t ssignal(int signum, sighandler_t action);
Feature Test Macro Requirements for glibc (see
feature_test_macros(7)):
gsignal(), ssignal():
Since glibc 2.19:
_DEFAULT_SOURCE
glibc 2.19 and earlier:
_SVID_SOURCE
Don't use these functions under Linux. Due to a historical
mistake, under Linux these functions are aliases for raise(3) and
signal(2), respectively.
Elsewhere, on System V-like systems, these functions implement
software signaling, entirely independent of the classical
signal(2) and kill(2) functions. The function ssignal() defines
the action to take when the software signal with number signum is
raised using the function gsignal(), and returns the previous such
action or SIG_DFL. The function gsignal() does the following: if
no action (or the action SIG_DFL) was specified for signum, then
it does nothing and returns 0. If the action SIG_IGN was
specified for signum, then it does nothing and returns 1.
Otherwise, it resets the action to SIG_DFL and calls the action
function with argument signum, and returns the value returned by
that function. The range of possible values signum varies (often
1–15 or 1–17).
For an explanation of the terms used in this section, see
attributes(7).
┌──────────────────────────────┬───────────────┬─────────────────┐
│ Interface │ Attribute │ Value │
├──────────────────────────────┼───────────────┼─────────────────┤
│ gsignal() │ Thread safety │ MT-Safe │
├──────────────────────────────┼───────────────┼─────────────────┤
│ ssignal() │ Thread safety │ MT-Safe sigintr │
└──────────────────────────────┴───────────────┴─────────────────┘
None.
AIX, DG/UX, HP-UX, SCO, Solaris, Tru64. They are called obsolete
under most of these systems, and are broken under glibc. Some
systems also have gsignal_r() and ssignal_r().
kill(2), signal(2), raise(3)
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-6.15.tar.gz
fetched from
⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
2025-08-11. 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 6.15 2025-05-17 gsignal(3)
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HTML rendering created 2025-09-06 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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