Originální popis anglicky:
gsignal, ssignal - software signal facility
Návod, kniha: Linux Programmer's Manual
#include <signal.h>
typedef void (*sighandler_t)(int);
int gsignal(signum);
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 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).
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)
