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sigmask()

Construct a mask for a signal number

Synopsis:

#include <unix.h>

#define sigmask(s)      (1L<<((s)-1))

Arguments:

s
The signal that you want to create a mask for. For more information, see “POSIX signals” in the documentation for SignalAction().

Library:

libc

Use the -l c option to qcc to link against this library. This library is usually included automatically.

Description:

This macro constructs the mask for a given signal number. Use sigmask() in conjunction with sigblock(), sigsetmask(), and sigunblock().

Returns:

The signal mask.

Classification:

Unix

Safety:
Cancellation point No
Interrupt handler Yes
Signal handler Yes
Thread Yes

Caveats:

Use of these interfaces should be restricted to only applications written on BSD platforms. Use of these interfaces with any of the system libraries or in multithreaded applications is unsupported.

See also:

kill(), sigaction(), sigblock(), signal(), sigpause(), sigsetmask(), sigunblock()

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