bsd_signal (3) - Linux Man Pages
bsd_signal: signal handling with BSD semantics
bsd_signal - signal handling with BSD semantics
typedef void (*sighandler_t)(int);
sighandler_t bsd_signal(int signum, sighandler_t handler);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
Since glibc 2.26:
_XOPEN_SOURCE >= 500
&& ! (_POSIX_C_SOURCE >= 200809L)
Glibc 2.25 and earlier:
DESCRIPTIONThe bsd_signal() function takes the same arguments, and performs the same task, as signal(2).
The difference between the two is that bsd_signal() is guaranteed to provide reliable signal 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.
RETURN VALUEThe bsd_signal() function returns the previous value of the signal handler, or SIG_ERR on error.
ERRORSAs for signal(2).
ATTRIBUTESFor an explanation of the terms used in this section, see attributes(7).
CONFORMING TO4.2BSD, POSIX.1-2001. POSIX.1-2008 removes the specification of bsd_signal(), recommending the use of sigaction(2) instead.
NOTESUse of bsd_signal() should be avoided; use sigaction(2) instead.
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