Name
sysv_signal — signal handling with System V
semantics
Synopsis
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.
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)
Copyright (c) 2007 Michael Kerrisk <mtk-manpages@gmx.net>
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