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NAME | SYNOPSIS | DESCRIPTION | ATTRIBUTES | CONFORMING TO | SEE ALSO | COLOPHON |
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GSIGNAL(3) Linux Programmer's Manual GSIGNAL(3)
gsignal, ssignal - software signal facility
#include <signal.h>
typedef void (*sighandler_t)(int);
int gsignal(int signum);
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 │
└──────────┴───────────────┴─────────────────┘
These functions are available under AIX, DG/UX, HP-UX, SCO, Solaris,
Tru64. They are called obsolete under most of these systems, and are
broken under Linux libc and glibc. Some systems also have
gsignal_r() and ssignal_r().
kill(2), signal(2), raise(3)
This page is part of release 4.15 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
https://www.kernel.org/doc/man-pages/.
2017-09-15 GSIGNAL(3)
Copyright and license for this manual page
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