Synopsis

#include <signal.h>

int sigsuspend(const sigset_t *sigmask);

Status

Partially implemented

Conformance

IEEE Std 1003.1-2017

Description

The sigsuspend() function shall replace the current signal mask of the calling thread with the set of signals pointed to by sigmask and then suspend the thread until delivery of a signal whose action is either to execute a signal-catching function or to terminate the process. This shall not cause any other signals that may have been pending on the process to become pending on the thread. If the action is to terminate the process then sigsuspend() shall never return. If the action is to execute a signal-catching function, then sigsuspend() shall return after the signal-catching function returns, with the signal mask restored to the set that existed prior to the sigsuspend() call. It is not possible to block signals that cannot be ignored. This is enforced by the system without causing an error to be indicated.

Return value

Since sigsuspend() suspends thread execution indefinitely, there is no successful completion return value. If a return occurs, -1 shall be returned and errno set to indicate the error.

Errors

The sigsuspend() function shall fail if:

  • EINTR - A signal is caught by the calling process and control is returned from the signal-catching function.

The following sections are informative.

Tests

Untested

Known bugs

None

See Also

  1. Standard library functions
  2. Table of Contents