/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*- * vim:expandtab:shiftwidth=8:tabstop=8: */ #if 0 #define DEBUG #endif /* for O_DIRECTORY and O_DIRECT */ #ifndef _GNU_SOURCE #define _GNU_SOURCE #endif #include #include #include #include #include #include #include #include #include typedef struct flag_mapping { const char *string; const int flag; } FLAG_MAPPING; FLAG_MAPPING flag_table[] = { {"O_RDONLY", O_RDONLY}, {"O_WRONLY", O_WRONLY}, {"O_RDWR", O_RDWR}, {"O_CREAT", O_CREAT}, {"O_EXCL", O_EXCL}, {"O_NOCTTY", O_NOCTTY}, {"O_TRUNC", O_TRUNC}, {"O_APPEND", O_APPEND}, {"O_NONBLOCK", O_NONBLOCK}, {"O_NDELAY", O_NDELAY}, {"O_SYNC", O_SYNC}, #ifdef O_DIRECT {"O_DIRECT", O_DIRECT}, #endif {"O_LARGEFILE", O_LARGEFILE}, {"O_DIRECTORY", O_DIRECTORY}, {"O_NOFOLLOW", O_NOFOLLOW}, {"O_LOV_DELAY_CREATE", O_LOV_DELAY_CREATE}, {"", -1} }; void Usage_and_abort(void) { fprintf(stderr, "Usage: openfile -f flags [ -m mode ] filename \n"); fprintf(stderr, "e.g. openfile -f O_RDWR:O_CREAT -m 0755 /etc/passwd\n"); exit(-1); } int main(int argc, char** argv) { int fd; int flags=0; mode_t mode=0644; char* fname=NULL; int mode_set=0; int flag_set=0; int file_set=0; int c; int save_errno; char* cloned_flags = NULL; if (argc == 1) Usage_and_abort(); while ((c = getopt (argc, argv, "f:m:")) != -1) { switch (c) { case 'f': { char *tmp; cloned_flags = (char *)malloc(strlen(optarg)+1); if (cloned_flags == NULL) { fprintf(stderr, "Insufficient memory.\n"); exit(-1); } strncpy(cloned_flags, optarg, strlen(optarg)+1); flags = atoi(cloned_flags); if (flags > 0) { flag_set = 1; #ifdef DEBUG printf("flags = %d\n",flags); #endif break; } else flags = 0; for (tmp = strtok(cloned_flags, ":|"); tmp; tmp = strtok(NULL, ":|")) { int i = 0; #ifdef DEBUG printf("flags = %s\n",tmp); #endif flag_set = 1; for (i = 0; flag_table[i].flag != -1; i++) { if (!strcmp(tmp, flag_table[i].string)){ flags |= flag_table[i].flag; break; } } if (flag_table[i].flag == -1) { fprintf(stderr, "No such flag: %s\n", tmp); exit(-1); } } free(cloned_flags); #ifdef DEBUG printf("flags = %x\n", flags); #endif break; } case 'm': #ifdef DEBUG printf("mode = %s\n", optarg); #endif mode = strtol(optarg, NULL, 8); mode_set = 1; #ifdef DEBUG printf("mode = %o\n", mode); #endif break; default: fprintf(stderr, "Bad parameters.\n"); Usage_and_abort(); } } if (optind == argc) { fprintf(stderr, "Bad parameters.\n"); Usage_and_abort(); } fname = argv[optind]; file_set = 1; if (!flag_set || !file_set) { fprintf(stderr, "Missing flag or file-name\n"); exit(-1); } if (flags & O_CREAT) fd = open(fname, flags, mode); else fd = open(fname, flags); save_errno = errno; if (fd != -1) { printf("Succeed in opening file \"%s\"(flags=%s", fname, cloned_flags); if (mode_set) printf(", mode=%o", mode); printf(")\n"); close(fd); return 0; } fprintf(stderr, "Error in opening file \"%s\"(flags=%s", fname, cloned_flags); if (mode_set) fprintf(stderr, ", mode=%o", mode); fprintf(stderr, ") %d: %s\n", save_errno, strerror(save_errno)); return save_errno; }