|BSD_SIGNAL(3)||Linux Programmer's Manual||BSD_SIGNAL(3)|
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)):
Glibc 2.25 and earlier: _XOPEN_SOURCE
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.
|bsd_signal ()||Thread safety||MT-Safe|
The use of sighandler_t is a GNU extension; this type is defined only if the _GNU_SOURCE feature test macro is defined.