siginterrupt(3p)

Usage

#include <signal.h>

int siginterrupt(int sig, int flag);

Prolog

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.

Overview

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;
else
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.

Errors

The siginterrupt() function shall fail if:

EINVAL: The sig argument is not a valid signal number.

The following sections are informative.

Examples

None.

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.

Rationale

None.

Future directions

None.