bsd_signal

       #define _XOPEN_SOURCE       /* See feature_test_macros(7) */
       #include <signal.h>

       typedef void (*sighandler_t)(int);

       sighandler_t bsd_signal(int signum, sighandler_t handler);

DESCRIPTION
       The  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  sys-
       tem  call, then the system call is automatically restarted.  A portable
       application cannot rely on signal(2) to provide these guarantees.

RETURN VALUE
       The bsd_signal() function returns the previous value of the signal han-
       dler, or SIG_ERR on error.

ERRORS
       As for signal(2).

ATTRIBUTES
       For   an   explanation   of   the  terms  used  in  this  section,  see
       attributes(7).

       +-------------+---------------+---------+
       |Interface    | Attribute     | Value   |
       +-------------+---------------+---------+
       |bsd_signal() | Thread safety | MT-Safe |
       +-------------+---------------+---------+
CONFORMING TO
       4.2BSD,  POSIX.1-2001.   POSIX.1-2008  removes  the  specification   of
       bsd_signal(), recommending the use of sigaction(2) instead.

NOTES
       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.

SEE ALSO
       sigaction(2), signal(2), sysv_signal(3), signal(7)

COLOPHON
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