bsd_signal - signal handling with BSD semantics
#include <signal.h> 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)): bsd_signal(): Since glibc 2.26: _XOPEN_SOURCE >= 500 && ! (_POSIX_C_SOURCE >= 200112L) 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.
The bsd_signal() function returns the previous value of the signal handler, or SIG_ERR on error.
As for signal(2).
For an explanation of the terms used in this section, see attributes(7).
The use of
sighandler_t is a GNU extension; this type is defined only if the _GNU_SOURCE feature test macro is defined.
This page is part of release 4.15 of the Linux
man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.