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POProgram executes but not all, I don't know what this error means
 

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  1. POProgram executes but not all, I don't know what this error means
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    <p>this program will create a father and 2 childs, there will be a chain characters, the father will fill 2 pipes, the first with the numbers, the second with the letters, the first child will read from the first pipe, and return how much numbers he got, the second son will read from the second pipe, and return how much letters he got.</p> <pre><code>#include &lt;stdio.h&gt; #include &lt;unistd.h&gt; #include &lt;string.h&gt; #include &lt;fcntl.h&gt; main() { printf("I am the father, I will create 2 sons, the first will read the numbers , the second will read the letters\n"); char *word="alibas123sam"; printf("Now 2 pipes will be created\n"); int fd1[2]; int fd2[2]; pipe(fd1); pipe(fd2); printf("Now the father will write numbers in the first pipe, and letters in the second\n"); int i; char numbers[20]; int j=0; char caracters[20]; int k=0; for (i=0;i&lt;20;i++) { if(word[i]&gt;='0' &amp;&amp; word[i]&lt;='9') //if number { close(fd1[0]); //closing reading write(fd1[1],&amp;word[i],1); } else { close(fd2[0]); write(fd2[1],&amp;word[i],1); } } printf("The father has wrote in the 2 pipes, now its time for the sons\n"); int f=fork(); if(f==0) //first son { for(i=0;i&lt;20;i++) { close(fd1[1]); //closing writing read(fd1[0],&amp;numbers[j],1); j++; } printf("first son read everything, he got %d Numbers\n", j); } else { f=fork(); if(f==0) { for(i=0;i&lt;20;i++) { close(fd2[1]); //closing writing read(fd2[0],&amp;caracters[k],1); k++; } printf("second son read everything, he got %d caracters\n", k); } }} </code></pre> <p>Error:</p> <pre><code>Disallowed system call: SYS_pipe </code></pre>
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    1. USMat
    1. USAli Bassam
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      1. POProgram executes but not all, I don't know what this error means
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      1. VTDownMod
    1. COYou should check the return value from your `pipe(2)` calls -- they appear to be failing (for a reason that seems _very_ odd). Where are you trying to execute this program? Is it a reasonable host or is it awkward? I'd wonder if you're confined by a [mandatory access control](http://en.wikipedia.org/wiki/Mandatory_access_control) tool such as [AppArmor](http://wiki.ubuntu.com/AppArmor/), [SELinux](http://en.wikipedia.org/wiki/Security-Enhanced_Linux), [TOMOYO](http://tomoyo.sourceforge.jp/index.html.en), or [SMACK](http://schaufler-ca.com/), but I doubt any would print such an _odd_ error.
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      1. POProgram executes but not all, I don't know what this error means
      1. USsarnold
    2. COwhy do you close the descriptors?
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      1. USShinTakezou
    3. COI am not sure this is the problem, but maybe you shouldn't close them *before* the fork, you can do it *after* you forked, if you don't need them
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      1. POProgram executes but not all, I don't know what this error means
      1. USShinTakezou
 

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