GSIGNAL(3) Linux Programmer's Manual GSIGNAL(3)NAME
gsignal, ssignal - software signal facility
SYNOPSIS
#include <signal.h>
typedef void (*sighandler_t)(int);
int gsignal(signum);
sighandler_t ssignal(int signum, sighandler_t action);
DESCRIPTION
Don't use these functions under Linux. Due to a historical mistake,
under Linux these functions are aliases for raise() and signal(),
respectively.
Elsewhere, on System V-like systems, these functions implement software
signalling, entirely independent of the classical signal and kill func‐
tions. The function ssignal() defines the action to take when the soft‐
ware signal with number signum is raised using the function gsignal(),
and returns the previous such action or SIG_DFL. The function gsig‐
nal() 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 parameter 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 ALSOkill(2), signal(2), raise(3)notGNU 2002-08-25 GSIGNAL(3)
