CentOS 7.0 - man page for bsd_signal (centos section 3)
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BSD_SIGNAL(3) Linux Programmer's Manual BSD_SIGNAL(3)
bsd_signal - signal handling with BSD semantics
#define _XOPEN_SOURCE /* See feature_test_macros(7) */
typedef void (*sighandler_t)(int);
sighandler_t bsd_signal(int signum, sighandler_t handler);
The bsd_signal() function takes the same arguments, and performs the same task, as sig-
The difference between the two is that bsd_signal() is guaranteed to provide reliable sig-
nal semantics, that is: a) the disposition of the signal is not reset to the default when
the handler is invoked; b) delivery of further instances of the signal is blocked while
the signal handler is executing; and c) if the handler interrupts a blocking system call,
then the system call is automatically restarted. A portable application cannot rely on
signal(2) to provide these guarantees.
The bsd_signal() function returns the previous value of the signal handler, or SIG_ERR on
As for signal(2).
4.2BSD, POSIX.1-2001. POSIX.1-2008 removes the specification of bsd_signal(), recommend-
ing the use of sigaction(2) instead.
Use of bsd_signal() should be avoided; use sigaction(2) instead.
On modern Linux systems, bsd_signal() and signal(2) are equivalent. But on older systems,
signal(2) provided unreliable 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), sysv_signal(3), signal(7)
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