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| <h4 class="subsection">24.10.1 BSD Function to Establish a Handler</h4> |
| |
| <!-- signal.h --> |
| <!-- BSD --> |
| <div class="defun"> |
| — Data Type: <b>struct sigvec</b><var><a name="index-struct-sigvec-2992"></a></var><br> |
| <blockquote><p>This data type is the BSD equivalent of <code>struct sigaction</code> |
| (see <a href="Advanced-Signal-Handling.html#Advanced-Signal-Handling">Advanced Signal Handling</a>); it is used to specify signal actions |
| to the <code>sigvec</code> function. It contains the following members: |
| |
| <dl> |
| <dt><code>sighandler_t sv_handler</code><dd>This is the handler function. |
| |
| <br><dt><code>int sv_mask</code><dd>This is the mask of additional signals to be blocked while the handler |
| function is being called. |
| |
| <br><dt><code>int sv_flags</code><dd>This is a bit mask used to specify various flags which affect the |
| behavior of the signal. You can also refer to this field as |
| <code>sv_onstack</code>. |
| </dl> |
| </p></blockquote></div> |
| |
| <p>These symbolic constants can be used to provide values for the |
| <code>sv_flags</code> field of a <code>sigvec</code> structure. This field is a bit |
| mask value, so you bitwise-OR the flags of interest to you together. |
| |
| <!-- signal.h --> |
| <!-- BSD --> |
| <div class="defun"> |
| — Macro: int <b>SV_ONSTACK</b><var><a name="index-SV_005fONSTACK-2993"></a></var><br> |
| <blockquote><p>If this bit is set in the <code>sv_flags</code> field of a <code>sigvec</code> |
| structure, it means to use the signal stack when delivering the signal. |
| </p></blockquote></div> |
| |
| <!-- signal.h --> |
| <!-- BSD --> |
| <div class="defun"> |
| — Macro: int <b>SV_INTERRUPT</b><var><a name="index-SV_005fINTERRUPT-2994"></a></var><br> |
| <blockquote><p>If this bit is set in the <code>sv_flags</code> field of a <code>sigvec</code> |
| structure, it means that system calls interrupted by this kind of signal |
| should not be restarted if the handler returns; instead, the system |
| calls should return with a <code>EINTR</code> error status. See <a href="Interrupted-Primitives.html#Interrupted-Primitives">Interrupted Primitives</a>. |
| </p></blockquote></div> |
| |
| <!-- signal.h --> |
| <!-- Sun --> |
| <div class="defun"> |
| — Macro: int <b>SV_RESETHAND</b><var><a name="index-SV_005fRESETHAND-2995"></a></var><br> |
| <blockquote><p>If this bit is set in the <code>sv_flags</code> field of a <code>sigvec</code> |
| structure, it means to reset the action for the signal back to |
| <code>SIG_DFL</code> when the signal is received. |
| </p></blockquote></div> |
| |
| <!-- signal.h --> |
| <!-- BSD --> |
| <div class="defun"> |
| — Function: int <b>sigvec</b> (<var>int signum, const struct sigvec *action,struct sigvec *old-action</var>)<var><a name="index-sigvec-2996"></a></var><br> |
| <blockquote><p>This function is the equivalent of <code>sigaction</code> (see <a href="Advanced-Signal-Handling.html#Advanced-Signal-Handling">Advanced Signal Handling</a>); it installs the action <var>action</var> for the signal <var>signum</var>, |
| returning information about the previous action in effect for that signal |
| in <var>old-action</var>. |
| </p></blockquote></div> |
| |
| <!-- signal.h --> |
| <!-- BSD --> |
| <div class="defun"> |
| — Function: int <b>siginterrupt</b> (<var>int signum, int failflag</var>)<var><a name="index-siginterrupt-2997"></a></var><br> |
| <blockquote><p>This function specifies which approach to use when certain primitives |
| are interrupted by handling signal <var>signum</var>. If <var>failflag</var> is |
| false, signal <var>signum</var> restarts primitives. If <var>failflag</var> is |
| true, handling <var>signum</var> causes these primitives to fail with error |
| code <code>EINTR</code>. See <a href="Interrupted-Primitives.html#Interrupted-Primitives">Interrupted Primitives</a>. |
| </p></blockquote></div> |
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