siginterrupt(3) [osx man page]

SIGINTERRUPT(3) 					   BSD Library Functions Manual 					   SIGINTERRUPT(3)

NAME

     siginterrupt -- allow signals to interrupt system calls

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <signal.h>

     int
     siginterrupt(int sig, int flag);

DESCRIPTION

     The siginterrupt() function is used to change the system call restart behavior when a system call is interrupted by the specified signal.	If
     the flag is false (0), then system calls will be restarted if they are interrupted by the specified signal and no data has been transferred
     yet.  System call restart has been the default behavior since 4.2BSD, and is the default behaviour for signal(3) on FreeBSD.

     If the flag is true (1), then restarting of system calls is disabled.  If a system call is interrupted by the specified signal and no data
     has been transferred, the system call will return -1 with the global variable errno set to EINTR.	Interrupted system calls that have started
     transferring data will return the amount of data actually transferred.  System call interrupt is the signal behavior found on 4.1BSD and AT&T
     System V UNIX systems.

     Note that the new 4.2BSD signal handling semantics are not altered in any other way.  Most notably, signal handlers always remain installed
     until explicitly changed by a subsequent sigaction(2) call, and the signal mask operates as documented in sigaction(2).  Programs may switch
     between restartable and interruptible system call operation as often as desired in the execution of a program.

     Issuing a siginterrupt(3) call during the execution of a signal handler will cause the new action to take place on the next signal to be
     caught.

NOTES

     This library routine uses an extension of the sigaction(2) system call that is not available in 4.2BSD; hence, it should not be used if back-
     ward compatibility is needed.

RETURN VALUES

     The siginterrupt() function returns the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to
     indicate the error.

ERRORS

     The siginterrupt() call fails if:

     [EINVAL]		The sig argument is not a valid signal number.

SEE ALSO

     sigaction(2), sigblock(2), sigpause(2), sigsetmask(2), signal(3)

HISTORY

     The siginterrupt() function appeared in 4.3BSD.

BSD
								   June 4, 1993 							       BSD

siginterrupt(3) 					     Library Functions Manual						   siginterrupt(3)

NAME

       siginterrupt - Allows signals to interrupt functions

LIBRARY

       Standard C Library (libc.so, libc.a)

       Berkeley Compatibility Library (libbsd.a)

SYNOPSIS

       #include <signal.h>	  /* libc version */

       int siginterrupt(
	       int sig,
	       int flag) ;

STANDARDS

       Interfaces documented on this reference page conform to industry standards as follows:

       siginterrupt() (libc version):  XSH4.2

       Refer to the standards(5) reference page for more information about industry standards and associated tags.

PARAMETERS

       Specifies  the expected interrupt signal.  Indicates whether the function is to restart when interrupted by the specified signal.  When the
       flag parameter is TRUE, restart is disabled. When the flag parameter is FALSE, restart is enabled.

DESCRIPTION

       The siginterrupt() function is used to change the restart behavior of a system call when it is interrupted by the signal specified  by  the
       sig  parameter.	When the flag parameter is FALSE (0), system calls restart when they are interrupted by the sig signal and no data has yet
       been transferred.

       When the flag parameter is TRUE (1), restart of system calls is disabled.  When a system call is interrupted by the sig signal and no  data
       has  been  transferred, the function returns a value of -1 with errno set to [EINTR]. Otherwise, interrupted system calls that have started
       transferring data return a value that is the number of data bytes actually transferred.

       [Tru64 UNIX]  System call interrupt is the default behavior unless the calling program has been linked with  the  libbsd  library  and  the
       libbsd version of signal() has been used.

NOTES

       The  siginterrupt()  function  is  provided  for  compatibility with BSD systems.  When writing or rewriting portable applications, use the
       sigaction() function with the SA_RESTART flag instead of siginterrupt().

       The use of the siginterrupt() function does not affect signal-handling semantics in any other way.  Programs may switch between restartable
       and interruptible system call operation as often as desired in the execution of a program.

       Issuing	a  siginterrupt()  call during the execution of a signal handler causes the new action to take place when the next instance of the
       specified signal is caught.

RETURN VALUES

       Upon successful completion, siginterrupt() returns a value of 0 (zero). Otherwise, a value of -1 is returned to indicate  that  an  invalid
       signal value has been used.

ERRORS

       If  the	siginterrupt()	function fails, errno may be set to the following value: The value of the sig parameter does not represent a valid
       signal.

RELATED INFORMATION

       Functions: sigaction(2), sigprocmask(2), sigsuspend(2)

       Standards: standards(5) delim off

																   siginterrupt(3)