siginterrupt(3) [mojave 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

Check Out this Related Man Page

SIGINTERRUPT(3) 					     Linux Programmer's Manual						   SIGINTERRUPT(3)

NAME

       siginterrupt - allow signals to interrupt system calls

SYNOPSIS

       #include <signal.h>

       int siginterrupt(int sig, int flag);

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       siginterrupt():
	   _XOPEN_SOURCE >= 500
	       || /* Since glibc 2.12: */ _POSIX_C_SOURCE >= 200809L
	       || /* Glibc versions <= 2.19: */ _BSD_SOURCE

DESCRIPTION

       The  siginterrupt()  function  changes  the  restart behavior when a system call is interrupted by the signal sig.  If the flag argument is
       false (0), then system calls will be restarted if interrupted by the specified signal sig.  This is the default behavior in Linux.

       If the flag argument is true (1) and no data has been transferred, then a system call interrupted by the signal	sig  will  return  -1  and
       errno will be set to EINTR.

       If  the flag argument is true (1) and data transfer has started, then the system call will be interrupted and will return the actual amount
       of data transferred.

RETURN VALUE

       The siginterrupt() function returns 0 on success.  It returns -1 if the signal number sig is invalid, with errno set to indicate the  cause
       of the error.

ERRORS

       EINVAL The specified signal number is invalid.

ATTRIBUTES

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

       +---------------+---------------+-------------------------+
       |Interface      | Attribute     | Value			 |
       +---------------+---------------+-------------------------+
       |siginterrupt() | Thread safety | MT-Unsafe const:sigintr |
       +---------------+---------------+-------------------------+
CONFORMING TO

       4.3BSD,	POSIX.1-2001.	POSIX.1-2008  marks  siginterrupt()  as  obsolete,  recommending  the use of sigaction(2) with the SA_RESTART flag
       instead.

SEE ALSO

       signal(2)

COLOPHON

       This page is part of release 4.15 of the Linux man-pages project.  A description of the project, information about reporting bugs, and  the
       latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.

								    2016-03-15							   SIGINTERRUPT(3)

Linux and UNIX Man Pages

siginterrupt(3) [mojave man page]

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