Name

siginterrupt — allow signals to interrupt system calls

Synopsis

#include <signal.h>
int siginterrupt( int   sig,
  int   flag);
[Note] Note
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
siginterrupt():
_BSD_SOURCE || _XOPEN_SOURCE >= 500

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. However, when a new signal handler is specified with the signal(2) function, the system call is interrupted by default.

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 the global variable 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, or −1 if the signal number sig is invalid.

ERRORS

EINVAL

The specified signal number is invalid.

CONFORMING TO

4.3BSD, POSIX.1-2001.

SEE ALSO

signal(2)

COLOPHON

This page is part of release 2.79 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.


  Copyright 1993 David Metcalfe (davidprism.demon.co.uk)

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References consulted:
    Linux libc source code
    Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
    386BSD man pages
Modified Sun Jul 25 10:40:51 1993 by Rik Faith (faithcs.unc.edu)
Modified Sun Apr 14 16:20:34 1996 by Andries Brouwer (aebcwi.nl)