21 lines
487 B
C
21 lines
487 B
C
#include "kernel/types.h"
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#include "user/user.h"
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int main(int argc, char *argv[]) {
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int proc_f2s[2], proc_s2f[2];
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char buffer[8];
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pipe(proc_f2s);
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pipe(proc_s2f);
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if (fork() == 0) {
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read(proc_s2f[0], buffer, 4);
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printf("%d: received %s\n", getpid(), buffer);
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write(proc_f2s[1], "pong", strlen("pong"));
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} else {
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write(proc_s2f[1], "ping", strlen("ping"));
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read(proc_f2s[0], buffer, 4);
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printf("%d: received %s\n", getpid(), buffer);
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}
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exit(0);
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} |