#include #include #include int main() { pid.t pid, pid1; /* fork a child process */ pid = fork(); if (pid < 0) { /* error occurred */ fprintf(stderr, "Fork Failed"); return 1; } else if (pid pidi = getpid(); printf("child: pid = %d",pid); /* A */ printf("child: pid1 } else { /* parent process */ pid1 = getpid(); printf ("parent: pid = %d",pid); /* C */ printf("parent: pid1 wait (NULL); } 0) { /* child process */ %3D %d", pid1); /* B */ %3D %a",pid1); /* D */ return 0; }

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