Provided by: manpages-dev_3.54-1ubuntu1_all 
NAME
gsignal, ssignal - software signal facility
SYNOPSIS
#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(): _SVID_SOURCE
DESCRIPTION
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).
CONFORMING TO
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().
SEE ALSO
kill(2), signal(2), raise(3)
COLOPHON
This page is part of release 3.54 of the Linux man-pages project. A description of the project, and
information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.
2007-07-26 GSIGNAL(3)