diff options
Diffstat (limited to 'devdocs/c/program%2Fsig_err.html')
| -rw-r--r-- | devdocs/c/program%2Fsig_err.html | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/devdocs/c/program%2Fsig_err.html b/devdocs/c/program%2Fsig_err.html new file mode 100644 index 00000000..5e2118d6 --- /dev/null +++ b/devdocs/c/program%2Fsig_err.html @@ -0,0 +1,49 @@ + <h1 id="firstHeading" class="firstHeading">SIG_ERR</h1> <table class="t-dcl-begin"> <tr class="t-dsc-header"> <th> Defined in header <code><signal.h></code> </th> <th> </th> <th> </th> </tr> <tr class="t-dcl"> <td class="t-dcl-nopad"> <pre data-language="c">#define SIG_ERR /* implementation defined */</pre> +</td> <td class="t-dcl-nopad"> </td> <td class="t-dcl-nopad"> </td> </tr> </table> <p>A value of type <code>void (*)(int)</code>. When returned by <code><a href="signal" title="c/program/signal">signal</a></code>, indicates that an error has occurred.</p> +<h3 id="Example"> Example</h3> <div class="t-example"> <div class="c source-c"><pre data-language="c">#include <stdio.h> +#include <stdlib.h> +#include <signal.h> + +void signal_handler(int sig) +{ + printf("Received signal: %d\n", sig); +} + +int main(void) +{ + /* Install a signal handler. */ + if (signal(SIGTERM, signal_handler) == SIG_ERR) + { + printf("Error while installing a signal handler.\n"); + exit(EXIT_FAILURE); + } + + printf("Sending signal: %d\n", SIGTERM); + if (raise(SIGTERM) != 0) + { + printf("Error while raising the SIGTERM signal.\n"); + exit(EXIT_FAILURE); + } + + printf("Exit main()\n"); + return EXIT_SUCCESS; +}</pre></div> <p>Output:</p> +<div class="text source-text"><pre data-language="c">Sending signal: 15 +Received signal: 15 +Exit main()</pre></div> </div> <h3 id="References"> References</h3> <ul> +<li> C17 standard (ISO/IEC 9899:2018): </li> +<ul><li> 7.14/3 Signal handling <signal.h> (p: 194) </li></ul> +<li> C11 standard (ISO/IEC 9899:2011): </li> +<ul><li> 7.14/3 Signal handling <signal.h> (p: 265) </li></ul> +<li> C99 standard (ISO/IEC 9899:1999): </li> +<ul><li> 7.14/3 Signal handling <signal.h> (p: 246) </li></ul> +<li> C89/C90 standard (ISO/IEC 9899:1990): </li> +<ul><li> 4.7 SIGNAL HANDLING <signal.h> </li></ul> +</ul> <h3 id="See_also"> See also</h3> <table class="t-dsc-begin"> <tr class="t-dsc"> <td> <div><a href="signal" title="c/program/signal"> <span class="t-lines"><span>signal</span></span></a></div> </td> <td> sets a signal handler for particular signal <br> <span class="t-mark">(function)</span> </td> +</tr> <tr class="t-dsc"> <td colspan="2"> <span><a href="https://en.cppreference.com/w/cpp/utility/program/SIG_ERR" title="cpp/utility/program/SIG ERR">C++ documentation</a></span> for <code>SIG_ERR</code> </td> +</tr> </table> <div class="_attribution"> + <p class="_attribution-p"> + © cppreference.com<br>Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.<br> + <a href="https://en.cppreference.com/w/c/program/SIG_ERR" class="_attribution-link">https://en.cppreference.com/w/c/program/SIG_ERR</a> + </p> +</div> |