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sysv_signal
Langue: en
Version: 2007-05-04 (fedora - 06/07/09)
Section: 3 (Bibliothèques de fonctions)
NAME
sysv_signal - signal handling with System V semanticsSYNOPSIS
#define _GNU_SOURCE#include <signal.h>
typedef void (*sighandler_t)(int);
sighandler_t sysv_signal(int signum, sighandler_t handler);
DESCRIPTION
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.
RETURN VALUE
The sysv_signal() function returns the previous value of the signal handler, or SIG_ERR on error.ERRORS
As for signal(2).CONFORMING TO
This function is non-standard.NOTES
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 only defined if the _GNU_SOURCE feature test macro is defined.
SEE ALSO
sigaction(2), signal(2), bsd_signal(3), feature_test_macros(7), signal(7)COLOPHON
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