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)