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| <h4 class="subsection">24.10.2 BSD Functions for Blocking Signals</h4> |
| |
| <!-- signal.h --> |
| <!-- BSD --> |
| <div class="defun"> |
| — Macro: int <b>sigmask</b> (<var>int signum</var>)<var><a name="index-sigmask-2998"></a></var><br> |
| <blockquote><p>This macro returns a signal mask that has the bit for signal <var>signum</var> |
| set. You can bitwise-OR the results of several calls to <code>sigmask</code> |
| together to specify more than one signal. For example, |
| |
| <pre class="smallexample"> (sigmask (SIGTSTP) | sigmask (SIGSTOP) |
| | sigmask (SIGTTIN) | sigmask (SIGTTOU)) |
| </pre> |
| <p class="noindent">specifies a mask that includes all the job-control stop signals. |
| </p></blockquote></div> |
| |
| <!-- signal.h --> |
| <!-- BSD --> |
| <div class="defun"> |
| — Function: int <b>sigblock</b> (<var>int mask</var>)<var><a name="index-sigblock-2999"></a></var><br> |
| <blockquote><p>This function is equivalent to <code>sigprocmask</code> (see <a href="Process-Signal-Mask.html#Process-Signal-Mask">Process Signal Mask</a>) with a <var>how</var> argument of <code>SIG_BLOCK</code>: it adds the |
| signals specified by <var>mask</var> to the calling process's set of blocked |
| signals. The return value is the previous set of blocked signals. |
| </p></blockquote></div> |
| |
| <!-- signal.h --> |
| <!-- BSD --> |
| <div class="defun"> |
| — Function: int <b>sigsetmask</b> (<var>int mask</var>)<var><a name="index-sigsetmask-3000"></a></var><br> |
| <blockquote><p>This function equivalent to <code>sigprocmask</code> (see <a href="Process-Signal-Mask.html#Process-Signal-Mask">Process Signal Mask</a>) with a <var>how</var> argument of <code>SIG_SETMASK</code>: it sets |
| the calling process's signal mask to <var>mask</var>. The return value is |
| the previous set of blocked signals. |
| </p></blockquote></div> |
| |
| <!-- signal.h --> |
| <!-- BSD --> |
| <div class="defun"> |
| — Function: int <b>sigpause</b> (<var>int mask</var>)<var><a name="index-sigpause-3001"></a></var><br> |
| <blockquote><p>This function is the equivalent of <code>sigsuspend</code> (see <a href="Waiting-for-a-Signal.html#Waiting-for-a-Signal">Waiting for a Signal</a>): it sets the calling process's signal mask to <var>mask</var>, |
| and waits for a signal to arrive. On return the previous set of blocked |
| signals is restored. |
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