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POImplementing EINVAL, EPERM, ESRCH in Kill()
 

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  1. POImplementing EINVAL, EPERM, ESRCH in Kill()
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    <p>I am trying to implement EINVAL, EPERM, ESRCH in my program.</p> <blockquote> <p>ERRORS<br> EINVAL An invalid signal was specified.<br> EPERM The process does not have permission to send the signal to any of the target processes. ESRCH The pid or process group does not exist.</p> </blockquote> <p>Here's my source code :</p> <pre><code>#include &lt;stdio.h&gt; #include &lt;sys/types.h&gt; #include &lt;signal.h&gt; #include &lt;unistd.h&gt; int main(void) { int errno, pid; puts("Enter a process id : "); scanf("%d", &amp;pid); errno = kill(pid, 1); if(errno == -1) { printf("Cannot find or kill the specified process\n"); } switch(errno) { case EINVAL: printf("An invalid signal was specified.\n"); break; case EPERM: printf("The process does not have permission to send the signal to any of the target processes.\n"); break; case ESRCH: printf("The pid or process group does not exist."); break; } } </code></pre> <p>And when I compile the program I get the following errors.</p> <blockquote> <p>unipro@ubuguest:/SoftDev/ADSD/Module 1/Unit 1/Pratice/C/C_adv/unix$ cc killApp.c -o killApp<br> killApp.c: In function ‘main’:<br> killApp.c:29: error: ‘EINVAL’ undeclared (first use in this function)<br> killApp.c:29: error: (Each undeclared identifier is reported only once<br> killApp.c:29: error: for each function it appears in.)<br> killApp.c:33: error: ‘EPERM’ undeclared (first use in this function)<br> killApp.c:37: error: ‘ESRCH’ undeclared (first use in this function)<br> unipro@ubuguest:/SoftDev/ADSD/Module 1/Unit 1/Pratice/C/C_adv/unix$ <br></p> </blockquote> <p>So where are EINVAL, EPERM, ESRCH defined? Do I need to define any additional header file? Or I am implementing it in a wrong way?</p> <p><strong>Updated Code [working code] :</strong></p> <pre><code>#include &lt;stdio.h&gt; #include &lt;sys/types.h&gt; #include &lt;signal.h&gt; #include &lt;unistd.h&gt; #include &lt;errno.h&gt; int main(void) { int status, pid; puts("Enter a process id : "); scanf("%d", &amp;pid); status = kill(pid, 1); switch(errno) { case EINVAL: printf("An invalid signal was specified.\n"); break; case EPERM: printf("The process does not have permission to send the signal to any of the target processes.\n"); break; case ESRCH: printf("The pid or process group does not exist."); break; } } </code></pre> <p>Thanks.</p>
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    1. COYou probably should be using `strerror` or `perror` to get the error messages rather than writing your own. It's easier, more concise, and on many systems it will get you translations to the user's native language at no cost.
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    2. COthanks for the advice.
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