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can anyone explain this programing codes? proc1.c #include <stdio.h> int main() { int fork_return; fork_return = fork(); printf("PID=%d, PPID=%d, fork_return=%d\n", getpid(), getppid (), fork_return); sleep(10); /* wait for 10 sec */ return 0; } proc2.c #inlcude <stdio.h> int main() { int chpid=fork(); if (chpid < 0) { printf("ERROR\n"); exit(1); } … 
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