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ssignal.3

GSIGNAL

Section: Linux Programmer's Manual (3)
Updated: 2007-07-26
Index Return to Main Contents
 

NAME

gsignal, ssignal - software signal facility  

SYNOPSIS

#include <signal.h>

typedef void (*sighandler_t)(int);

int gsignal(intsignum);

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 3.21 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/.


 

Index

NAME
SYNOPSIS
DESCRIPTION
CONFORMING TO
SEE ALSO
COLOPHON

 

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