bsd_signal man page on Solaris

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bsd_signal(3C)		 Standard C Library Functions		bsd_signal(3C)

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 USAGE below).

       The function call bsd_signal(sig, func) has an effect as if implemented
       as:

       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 differ‐
       ent type.

RETURN VALUES
       Upon  successful	 completion,  bsd_signal() returns the previous action
       for sig. Otherwise, SIG_ERR is returned and errno is  set  to  indicate
       the error.

ERRORS
       Refer to sigaction(2).

USAGE
       This function is a direct replacement for the BSD signal(3UCB) function
       for simple applications that are installing  a  single-argument	signal
       handler	function.  If a BSD signal handler function is being installed
       that expects more than one argument, the application has to be modified
       to  use	sigaction(2).  The  bsd_signal()  function differs from signal
       (3UCB) in that the SA_RESTART flag is set and the SA_RESETHAND will  be
       clear when bsd_signal() is used.	 The state of these flags is not spec‐
       ified for signal(3UCB).

ATTRIBUTES
       See attributes(5) for descriptions of the following attributes:

       ┌─────────────────────────────┬─────────────────────────────┐
       │      ATTRIBUTE TYPE	     │	    ATTRIBUTE VALUE	   │
       ├─────────────────────────────┼─────────────────────────────┤
       │Interface Stability	     │Standard			   │
       └─────────────────────────────┴─────────────────────────────┘

SEE ALSO
       sigaction(2),	 sigaddset(3C),	    sigemptyset(3C),	 signal(3UCB),
       attributes(5), standards(5)

SunOS 5.10			  24 Jul 2002			bsd_signal(3C)
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