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$ cat proc-self.c#include <stdio.h>#include <sys/types.h>#include <sys/stat.h>#include <fcntl.h>char *cmdline_fname = "/proc/self/cmdline";#define BUFSIZE 32int main(void) {        int cmdline_fd;        char cmdline[BUFSIZE];        cmdline_fd = open(cmdline_fname, O_RDONLY);        if (cmdline_fd != -1) {                if (read(cmdline_fd, cmdline, BUFSIZE) != -1) {                        printf("%s\n", cmdline);                }                close(cmdline_fd);        }}$ gcc -o proc-self{,.c}$ ./proc-self df lkjf lk./proc-self