1 #include <stdio.h> 2 #include <string.h> 3 #include <sys/types.h> 4 #include <fcntl.h> 5 #include <sys/stat.h> 6 #include <stdlib.h> 7 #include <fcntl.h> 8 9 static void usage(void) 10 { 11 fprintf(stderr, "touch: usage: touch [-alm] [-t time_t] <file>\n"); 12 exit(1); 13 } 14 15 int touch_main(int argc, char *argv[]) 16 { 17 int i, fd, aflag = 0, mflag = 0, debug = 0, flags = 0; 18 struct timespec specified_time, times[2]; 19 char *file = 0; 20 21 specified_time.tv_nsec = UTIME_NOW; 22 23 for (i = 1; i < argc; i++) { 24 if (argv[i][0] == '-') { 25 /* an option */ 26 const char *arg = argv[i]+1; 27 while (arg[0]) { 28 switch (arg[0]) { 29 case 'a': aflag = 1; break; 30 case 'm': mflag = 1; break; 31 case 't': 32 if ((i+1) >= argc) 33 usage(); 34 specified_time.tv_sec = atol(argv[++i]); 35 if (specified_time.tv_sec == 0) { 36 fprintf(stderr, "touch: invalid time_t\n"); 37 exit(1); 38 } 39 specified_time.tv_nsec = 0; 40 break; 41 case 'l': flags |= AT_SYMLINK_NOFOLLOW; break; 42 case 'd': debug = 1; break; 43 default: 44 usage(); 45 } 46 arg++; 47 } 48 } else { 49 /* not an option, and only accept one filename */ 50 if (i+1 != argc) 51 usage(); 52 file = argv[i]; 53 } 54 } 55 56 if (! file) { 57 fprintf(stderr, "touch: no file specified\n"); 58 exit(1); 59 } 60 61 if (access(file, F_OK)) 62 if ((fd=creat(file, 0666)) != -1) 63 close(fd); 64 65 if ((mflag == 0) && (aflag == 0)) 66 aflag = mflag = 1; 67 68 if (aflag) 69 times[0] = specified_time; 70 else 71 times[0].tv_nsec = UTIME_OMIT; 72 73 if (mflag) 74 times[1] = specified_time; 75 else 76 times[1].tv_nsec = UTIME_OMIT; 77 78 if (debug) { 79 fprintf(stderr, "file = %s\n", file); 80 fprintf(stderr, "times[0].tv_sec = %ld, times[0].tv_nsec = %ld\n", times[0].tv_sec, times[0].tv_nsec); 81 fprintf(stderr, "times[1].tv_sec = %ld, times[1].tv_nsec = %ld\n", times[1].tv_sec, times[1].tv_nsec); 82 fprintf(stderr, "flags = 0x%8.8x\n", flags); 83 } 84 85 return utimensat(AT_FDCWD, file, times, flags); 86 } 87 88
