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gsignal(3) — Linux manual page

gsignal(3)               Library Functions Manualgsignal(3)

NAME        top

       gsignal, ssignal - software signal facility

LIBRARY        top

       Standard C library (libc,-lc)

SYNOPSIS        top

#include <signal.h>typedef typeof(void (int))  *sighandler_t;[[deprecated]] int gsignal(intsignum);[[deprecated]] sighandler_t ssignal(intsignum, sighandler_taction);   Feature Test Macro Requirements for glibc (seefeature_test_macros(7)):gsignal(),ssignal():           Since glibc 2.19:               _DEFAULT_SOURCE           glibc 2.19 and earlier:               _SVID_SOURCE

DESCRIPTION        top

       Don't use these functions under Linux.  Due to a historical       mistake, under Linux these functions are aliases forraise(3) andsignal(2), respectively.       Elsewhere, on System V-like systems, these functions implement       software signaling, entirely independent of the classicalsignal(2) andkill(2) functions.  The functionssignal() defines       the action to take when the software signal with numbersignum is       raised using the functiongsignal(), and returns the previous such       action orSIG_DFL.  The functiongsignal() does the following: if       no action (or the actionSIG_DFL) was specified forsignum, then       it does nothing and returns 0.  If the actionSIG_IGNwas       specified forsignum, then it does nothing and returns 1.       Otherwise, it resets the action toSIG_DFLand calls the action       function with argumentsignum, and returns the value returned by       that function.  The range of possible valuessignum varies (often       1–15 or 1–17).

ATTRIBUTES        top

       For an explanation of the terms used in this section, seeattributes(7).       ┌──────────────────────────────┬───────────────┬─────────────────┐       │Interface│Attribute│Value│       ├──────────────────────────────┼───────────────┼─────────────────┤       │gsignal()                    │ Thread safety │ MT-Safe         │       ├──────────────────────────────┼───────────────┼─────────────────┤       │ssignal()                    │ Thread safety │ MT-Safe sigintr │       └──────────────────────────────┴───────────────┴─────────────────┘

STANDARDS        top

       None.

HISTORY        top

       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 havegsignal_r() andssignal_r().

SEE ALSO        top

kill(2),signal(2),raise(3)

COLOPHON        top

       This page is part of theman-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 isnot       part of the original manual page), send a mail to       man-pages@man7.orgLinux man-pages 6.15            2025-05-17gsignal(3)

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