sysv_signal man page on Archlinux

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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) */
       #include <signal.h>

       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 signal(2).

       However sysv_signal() provides the System V  unreliable	signal	semanā€
       tics, 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 error.

       As for signal(2).

   Multithreading (see pthreads(7))
       The sysv_signal() function is thread-safe.

       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 systems, 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)

       This  page  is  part of release 3.65 of the Linux man-pages project.  A
       description of the project, and information about reporting  bugs,  can
       be found at

				  2014-01-06			SYSV_SIGNAL(3)

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