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 speci-
       fied 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
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				  2016-03-15		       SIGINTERRUPT(3)