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| <h3 class="section">23.3 Non-Local Exits and Signals</h3> |
| |
| <p>In BSD Unix systems, <code>setjmp</code> and <code>longjmp</code> also save and |
| restore the set of blocked signals; see <a href="Blocking-Signals.html#Blocking-Signals">Blocking Signals</a>. However, |
| the POSIX.1 standard requires <code>setjmp</code> and <code>longjmp</code> not to |
| change the set of blocked signals, and provides an additional pair of |
| functions (<code>sigsetjmp</code> and <code>siglongjmp</code>) to get the BSD |
| behavior. |
| |
| <p>The behavior of <code>setjmp</code> and <code>longjmp</code> in the GNU library is |
| controlled by feature test macros; see <a href="Feature-Test-Macros.html#Feature-Test-Macros">Feature Test Macros</a>. The |
| default in the GNU system is the POSIX.1 behavior rather than the BSD |
| behavior. |
| |
| <p>The facilities in this section are declared in the header file |
| <samp><span class="file">setjmp.h</span></samp>. |
| <a name="index-setjmp_002eh-2801"></a> |
| <!-- setjmp.h --> |
| <!-- POSIX.1 --> |
| |
| <div class="defun"> |
| — Data Type: <b>sigjmp_buf</b><var><a name="index-sigjmp_005fbuf-2802"></a></var><br> |
| <blockquote><p>This is similar to <code>jmp_buf</code>, except that it can also store state |
| information about the set of blocked signals. |
| </p></blockquote></div> |
| |
| <!-- setjmp.h --> |
| <!-- POSIX.1 --> |
| <div class="defun"> |
| — Function: int <b>sigsetjmp</b> (<var>sigjmp_buf state, int savesigs</var>)<var><a name="index-sigsetjmp-2803"></a></var><br> |
| <blockquote><p>This is similar to <code>setjmp</code>. If <var>savesigs</var> is nonzero, the set |
| of blocked signals is saved in <var>state</var> and will be restored if a |
| <code>siglongjmp</code> is later performed with this <var>state</var>. |
| </p></blockquote></div> |
| |
| <!-- setjmp.h --> |
| <!-- POSIX.1 --> |
| <div class="defun"> |
| — Function: void <b>siglongjmp</b> (<var>sigjmp_buf state, int value</var>)<var><a name="index-siglongjmp-2804"></a></var><br> |
| <blockquote><p>This is similar to <code>longjmp</code> except for the type of its <var>state</var> |
| argument. If the <code>sigsetjmp</code> call that set this <var>state</var> used a |
| nonzero <var>savesigs</var> flag, <code>siglongjmp</code> also restores the set of |
| blocked signals. |
| </p></blockquote></div> |
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