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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | ATTRIBUTES | CONFORMING TO | NOTES | SEE ALSO | COLOPHON |
SYSV_SIGNAL(3) Linux Programmer's Manual SYSV_SIGNAL(3)
sysv_signal - signal handling with System V semantics
#define _GNU_SOURCE /* See feature_test_macros(7) */
#include <signal.h>
typedef void (*sighandler_t)(int);
sighandler_t sysv_signal(int signum, sighandler_t handler);
The sysv_signal() function takes the same arguments, and performs the
same task, as signal(2).
However sysv_signal() provides the System V unreliable signal
semantics, that is: a) the disposition of the signal is reset to the
default when the handler is invoked; b) delivery of further instances
of the signal is not blocked while the signal handler is executing;
and c) if the handler interrupts (certain) blocking system calls,
then the system call is not automatically restarted.
The sysv_signal() function returns the previous value of the signal
handler, or SIG_ERR on error.
As for signal(2).
For an explanation of the terms used in this section, see
attributes(7).
┌──────────────┬───────────────┬─────────┐
│Interface │ Attribute │ Value │
├──────────────┼───────────────┼─────────┤
│sysv_signal() │ Thread safety │ MT-Safe │
└──────────────┴───────────────┴─────────┘
This function is nonstandard.
Use of sysv_signal() should be avoided; use sigaction(2) instead.
On older Linux systems, sysv_signal() and signal(2) were equivalent.
But on newer systems, signal(2) provides reliable signal semantics;
see signal(2) for details.
The use of sighandler_t is a GNU extension; this type is defined only
if the _GNU_SOURCE feature test macro is defined.
sigaction(2), signal(2), bsd_signal(3), signal(7)
This page is part of release 4.12 of the Linux man-pages project. A
description of the project, information about reporting bugs, and the
latest version of this page, can be found at
https://www.kernel.org/doc/man-pages/.
2015-03-02 SYSV_SIGNAL(3)
Pages that refer to this page: signal(2), bsd_signal(3), signal(7)