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33 lines
927 B
33 lines
927 B
6 years ago
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#include <stdio.h>
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int main()
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{
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int child, grandson;
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char *sargs[] = { "/bin/echo", "Son ", "Hello", "World!", NULL};
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char *gargs[] = { "/bin/echo", "Grandson ", "Hello", "World!", NULL};
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if (!(child = fork()))
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{
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/* child */
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printf("child:s1: pid %d: %d is my father\n", getpid(), getppid());
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if(!(grandson=fork()))
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{
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printf("grandson: pid %d: %d is my father\n", getpid(), getppid());
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execve("/bin/echo", gargs, NULL);
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printf("pid %d: I am back, something is wrong!\n", getpid());
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}else{
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printf("child:s2: pid %d: %d is my father\n", getpid(), getppid());
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wait4(grandson, NULL, 0, NULL);
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execve("/bin/echo", sargs, NULL);
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printf("pid %d: I am back, something is wrong!\n", getpid());
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}
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}
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else
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{
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int myself = getpid();
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printf("parent: pid %d: %d is my son\n", myself, child);
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wait4(child, NULL, 0, NULL);
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printf("pid %d: done\n", myself);
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}
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return 0;
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}
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