gsignal(3) -- Linux man page
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 SYSV-like systems, these functions implement
software signalling, entirely independent of the classical
signal and kill 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 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
SVID2, XPG2.
These functions are available under AIX, DG-UX, HPUX, 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)
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