xv6-65oo2/user1.c

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C
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#include "user.h"
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char buf[32];
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int
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main(void)
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{
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int pid, fds[2], n;
pipe(fds);
pid = fork();
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if(pid > 0){
write(fds[1], "xyz", 4);
puts("w");
} else {
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n = read(fds[0], buf, sizeof(buf));
puts("r: ");
puts(buf);
puts("\n");
}
for(;;);
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}