Preliminary: | MT-Safe | AS-Safe | AC-Safe | See POSIX Safety Concepts.
This macro returns a signal mask that has the bit for signal signum set. You can bitwise-OR the results of several calls to
sigmask
together to specify more than one signal. For example,(sigmask (SIGTSTP) | sigmask (SIGSTOP) | sigmask (SIGTTIN) | sigmask (SIGTTOU))specifies a mask that includes all the job-control stop signals.
Preliminary: | MT-Safe | AS-Unsafe lock/hurd | AC-Unsafe lock/hurd | See POSIX Safety Concepts.
This function is equivalent to
sigprocmask
(see Process Signal Mask) with a how argument ofSIG_BLOCK
: it adds the signals specified by mask to the calling process's set of blocked signals. The return value is the previous set of blocked signals.
Preliminary: | MT-Safe | AS-Unsafe lock/hurd | AC-Unsafe lock/hurd | See POSIX Safety Concepts.
This function equivalent to
sigprocmask
(see Process Signal Mask) with a how argument ofSIG_SETMASK
: it sets the calling process's signal mask to mask. The return value is the previous set of blocked signals.
Preliminary: | MT-Unsafe race:sigprocmask/!bsd!linux | AS-Unsafe lock/hurd | AC-Unsafe lock/hurd | See POSIX Safety Concepts.
This function is the equivalent of
sigsuspend
(see Waiting for a Signal): it sets the calling process's signal mask to mask, and waits for a signal to arrive. On return the previous set of blocked signals is restored.