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Linux 2.6 - man page for bsd_signal (linux section 3posix)

BSD_SIGNAL(P)			    POSIX Programmer's Manual			    BSD_SIGNAL(P)

NAME
       bsd_signal - simplified signal facilities

SYNOPSIS
       #include <signal.h>

       void (*bsd_signal(int sig, void (*func)(int)))(int);

DESCRIPTION
       The  bsd_signal()  function provides a partially compatible interface for programs written
       to historical system interfaces (see APPLICATION USAGE).

       The function call bsd_signal(sig, func) shall be equivalent to the following:

	      void (*bsd_signal(int sig, void (*func)(int)))(int)
	      {
		  struct sigaction act, oact;

		  act.sa_handler = func;
		  act.sa_flags = SA_RESTART;

		  sigemptyset(&act.sa_mask);
		  sigaddset(&act.sa_mask, sig);
		  if (sigaction(sig, &act, &oact) == -1)
		      return(SIG_ERR);

		  return(oact.sa_handler);
	      }

       The handler function should be declared:

	      void handler(int sig);

       where sig is the signal number. The behavior is undefined if func is a function that takes
       more than one argument, or an argument of a different type.

RETURN VALUE
       Upon  successful completion, bsd_signal() shall return the previous action for sig. Other-
       wise, SIG_ERR shall be returned and errno shall be set to indicate the error.

ERRORS
       Refer to sigaction() .

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       This function is a direct replacement for the BSD signal() function  for  simple  applica-
       tions  that are installing a single-argument signal handler function. If a BSD signal han-
       dler function is being installed that expects more than one argument, the application  has
       to be modified to use sigaction(). The bsd_signal() function differs from signal() in that
       the SA_RESTART flag is set and the SA_RESETHAND is clear when bsd_signal()  is  used.  The
       state of these flags is not specified for signal().

       It is recommended that new applications use the sigaction() function.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       sigaction()  ,  sigaddset()  ,  sigemptyset()  , signal() , the Base Definitions volume of
       IEEE Std 1003.1-2001, <signal.h>

COPYRIGHT
       Portions of this text are reprinted and	reproduced  in	electronic  form  from	IEEE  Std
       1003.1,	2003  Edition,	Standard  for Information Technology -- Portable Operating System
       Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003  by
       the  Institute  of  Electrical  and  Electronics Engineers, Inc and The Open Group. In the
       event of any discrepancy between this version and the original IEEE  and  The  Open  Group
       Standard, the original IEEE and The Open Group Standard is the referee document. The orig-
       inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group			       2003				    BSD_SIGNAL(P)


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