siginterrupt man page


This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the corresponding Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.

siginterrupt — allow signals to interrupt functions


#include <signal.h>

int siginterrupt(int sig, int flag);


The siginterrupt() function shall change the restart behavior when a function is interrupted by the specified signal. The function siginterrupt(sig, flag) has an effect as if implemented as:

int siginterrupt(int sig, int flag) {
    int ret;
    struct sigaction act;

    (void) sigaction(sig, NULL, &act);
    if (flag)
        act.sa_flags &= ~SA_RESTART;
        act.sa_flags |= SA_RESTART;
    ret = sigaction(sig, &act, NULL);
    return ret;

Return Value

Upon successful completion, siginterrupt() shall return 0; otherwise, -1 shall be returned and errno set to indicate the error.


The siginterrupt() function shall fail if:

The sig argument is not a valid signal number.

The following sections are informative.

Application Usage

The siginterrupt() function supports programs written to historical system interfaces. Applications should use the sigaction() with the SA_RESTART flag instead of the obsolescent siginterrupt() function.

See Also

Section 2.4, Signal Concepts, sigaction()

The Base Definitions volume of POSIX.1‐2008, <signal.h>


2013 IEEE/The Open Group POSIX Programmer's Manual