Linux 2.6 - man page for sysv_signal (linux section 3)
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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) */
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 sig-
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
As for signal(2).
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 sys-
tems, 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)
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