source code of /small-scripts/stackexchange/chainfork.c

Last modified	2016-10-23
Lines	37

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#include <pthread.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <sys/wait.h>
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#define N_PROCS 42
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int main(int argc, char *argv[])
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{
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    int i;
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    pid_t child;
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    int status;
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    for (i = 0; i < N_PROCS; i++)
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    {
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        child = fork();
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        if (-1 == child)
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        {
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            fprintf(stderr, "fork() failed\n");

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            return 1;
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        }
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        /*
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         * The next iteration of the loop will only be executed

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         * by the child process.
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         */
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        if (child) break;
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    }
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    printf("I'm process #%d (PID=%d)\n", i, (long)getpid());

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    /*
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     * On the last iteration of the while loop, child is zero

     * for the last process in the chain.

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     */
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    if (child) wait(&status);
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    return 0;
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}
```