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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():
_BSD_SOURCE || _XOPEN_SOURCE >= 500 ||
_XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED
|| /* Since glibc 2.12: */ _POSIX_C_SOURCE >= 200809L
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
Multithreading (see pthreads(7))
The siginterrupt() function uses a global variable that is not pro-
tected, so it is not thread-safe.
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 3.69 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
http://www.kernel.org/doc/man-pages/.
2014-06-13 SIGINTERRUPT(3)
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