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error.c 219 B
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#include <unistd.h>
#include <stdio.h>
#include <string.h>
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#include <errno.h>

int main(int argc, char** argv) {
    chdir("nonexistent");
    printf("errno: %d = %s\n", errno, strerror(errno));
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    perror("perror");
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}