GSIGNAL(3) Linux Programmer's Manual GSIGNAL(3)
gsignal, ssignal - software signal facility
typedef void (*sighandler_t)(int);
sighandler_t ssignal(int signum, sighandler_t action);
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 noth-
ing and returns 1. Otherwise, it resets the action to SIG_DFL and calls the action func-
tion with parameter signum, and returns the value returned by that function. The range of
possible values signum varies (often 1-15 or 1-17).
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().
kill(2), signal(2), raise(3)
notGNU 2002-08-25 GSIGNAL(3)