1 #include <debug.h> 2 #include <unistd.h> 3 4 #include <stdio.h> 5 #include <sys/types.h> 6 #include <sys/stat.h> 7 #include <fcntl.h> 8 #include <string.h> 9 #include <errno.h> 10 11 int 12 main(int argc, char **argv) 13 { 14 char *fname; 15 int fd; 16 char magic[4]; 17 18 argc--, argv++; 19 FAILIF(argc != 1, "Expecting a file name!\n"); 20 fname = *argv; 21 22 fd = open(fname, O_RDONLY); 23 FAILIF(fd < 0, "Error opening %s for reading: %s (%d)!\n", 24 fname, strerror(errno), errno); 25 26 FAILIF(4 != read(fd, magic, 4), 27 "Could not read first 4 bytes from %s: %s (%d)!\n", 28 fname, strerror(errno), errno); 29 30 if (magic[0] != 0x7f) return 1; 31 if (magic[1] != 'E') return 1; 32 if (magic[2] != 'L') return 1; 33 if (magic[3] != 'F') return 1; 34 35 return 0; 36 } 37
