wendy

inotify based node watcher
git clone git://git.2f30.org/wendy.git
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commit 9fd06b0d1bdbc8cac24a9dd9a0bce8fe570a512f
parent 496ea93e3942b856d01b7a955c6e069b3828644b
Author: z3bra <willy@mailoo.org>
Date:   Mon Mar 30 20:43:57 +0200

formatting: 4 spaces -> 8 tabs

Diffstat:
wendy.c | 382+++++++++++++++++++++++++++++++++++++++----------------------------------------
1 file changed, 188 insertions(+), 194 deletions(-)
diff --git a/wendy.c b/wendy.c @@ -27,13 +27,12 @@ /* maximum number of event * queuing at the same time */ #define BUF_LEN (512 * (EVENT_SIZE+16)) -#define DEFAULT_FILE "." /* defaults to current directory */ #define DEFAULT_CHECK 1 /* defaults to 1 second */ struct node_t { - int wd; - char path[PATH_MAX]; - struct node_t *next; + int wd; + char path[PATH_MAX]; + struct node_t *next; }; extern char **environ; @@ -41,233 +40,228 @@ extern char **environ; int verbose = 0, nb = 0; struct node_t *head = NULL; - void + void usage() { - fputs("usage: wendy [-C] [-D] [-M] [-m mask] [-l] [-f file] [-t timeout] [-q] " - "[-e command [args] ..]\n" - "\t-C : raise creation events (default)\n" - "\t-D : raise deletion events\n" - "\t-M : raise modification events\n" - "\t-m mask : set mask manually (see -l))\n" - "\t-l : list events mask values\n" - "\t-f file : file to watch (everything is a file)\n" - "\t-t timeout : time between event check (in seconds)\n" - "\t-v : talk to me, program\n" - "\t-e command : command to launch (must be the last argument!)\n", - stdout); - exit(1); + fputs("usage: wendy [-m mask] [-l] [-f file] [-t timeout] [-q] " + "[-e command [args] ..]\n" + "\t-m mask : set mask manually (see -l))\n" + "\t-l : list events mask values\n" + "\t-f file : file to watch (everything is a file)\n" + "\t-t timeout : time between event check (in seconds)\n" + "\t-v : talk to me, program\n" + "\t-e command : command to launch (must be the last arg!)\n", + stdout); + exit(1); } - void + void list_events() { - fprintf(stdout, - "IN_ACCESS ........ %u\n" - "IN_MODIFY ........ %u\n" - "IN_ATTRIB ........ %u\n" - "IN_CLOSE_WRITE ... %u\n" - "IN_CLOSE_NOWRITE . %u\n" - "IN_OPEN .......... %u\n" - "IN_MOVED_FROM .... %u\n" - "IN_MOVED_TO ...... %u\n" - "IN_CREATE ........ %u\n" - "IN_DELETE ........ %u\n" - "IN_DELETE_SELF ... %u\n" - "IN_MOVE_SELF ..... %u\n" - "IN_ALL_EVENTS .... %u\n" - "IN_UNMOUNT ....... %u\n", - IN_ACCESS, - IN_MODIFY, - IN_ATTRIB, - IN_CLOSE_WRITE, - IN_CLOSE_NOWRITE, - IN_OPEN, - IN_MOVED_FROM, - IN_MOVED_TO, - IN_CREATE, - IN_DELETE, - IN_DELETE_SELF, - IN_MOVE_SELF, - IN_ALL_EVENTS, - IN_UNMOUNT - ); - exit(0); + fprintf(stdout, + "IN_ACCESS ........ %u\n" + "IN_MODIFY ........ %u\n" + "IN_ATTRIB ........ %u\n" + "IN_CLOSE_WRITE ... %u\n" + "IN_CLOSE_NOWRITE . %u\n" + "IN_OPEN .......... %u\n" + "IN_MOVED_FROM .... %u\n" + "IN_MOVED_TO ...... %u\n" + "IN_CREATE ........ %u\n" + "IN_DELETE ........ %u\n" + "IN_DELETE_SELF ... %u\n" + "IN_MOVE_SELF ..... %u\n" + "IN_ALL_EVENTS .... %u\n" + "IN_UNMOUNT ....... %u\n", + IN_ACCESS, + IN_MODIFY, + IN_ATTRIB, + IN_CLOSE_WRITE, + IN_CLOSE_NOWRITE, + IN_OPEN, + IN_MOVED_FROM, + IN_MOVED_TO, + IN_CREATE, + IN_DELETE, + IN_DELETE_SELF, + IN_MOVE_SELF, + IN_ALL_EVENTS, + IN_UNMOUNT + ); + exit(0); } - char * + char * read_filename(int fd) { - int i; - char *fn = NULL, ch; - - fn = malloc(PATH_MAX); - if (!fn) - return NULL; - - for (i=0; read(fd, &ch, 1) > 0 && i < PATH_MAX; i++) { - if (ch == 0 || ch == '\n') { - *(fn + i + 1) = 0; - return fn; - } else { - *(fn+i) = ch; - } - } - - return NULL; + int i; + char *fn = NULL, ch; + + fn = malloc(PATH_MAX); + if (!fn) + return NULL; + + for (i=0; read(fd, &ch, 1) > 0 && i < PATH_MAX; i++) { + if (ch == 0 || ch == '\n') { + *(fn + i + 1) = 0; + return fn; + } else { + *(fn+i) = ch; + } + } + + return NULL; } - int + int execvpe(const char *program, char **argv, char **envp) { - char **saved = environ; - int rc; - environ = envp; - rc = execvp(program, argv); - environ = saved; - return rc; + char **saved = environ; + int rc; + environ = envp; + rc = execvp(program, argv); + environ = saved; + return rc; } - struct node_t * + struct node_t * add_node(int wd, const char *path) { - struct node_t *n = NULL; + struct node_t *n = NULL; - n = malloc(sizeof(struct node_t)); + n = malloc(sizeof(struct node_t)); + if (!n) + return NULL; - if (!n) - return NULL; + n->wd = wd; + strncpy(n->path, path, PATH_MAX); + n->next = head ? head : NULL; + head = n; - n->wd = wd; - strncpy(n->path, path, PATH_MAX); - - n->next = head ? head : NULL; - head = n; - - return n; + return n; } - const char * + const char * wd_name(int wd) { - struct node_t *n = head; + struct node_t *n = head; - while (n && n->wd != wd) - n = n->next; + while (n && n->wd != wd) + n = n->next; - return n ? n->path : "unknown"; + return n ? n->path : "unknown"; } - int + int watch_node(int fd, const char *path, uint32_t mask) { - int wd = -1; + int wd = -1; - if (!path) - return -1; + if (!path) + return -1; - /* add a watcher on the file */ - wd = inotify_add_watch(fd, path, mask); - if (wd < 0) { - perror("inotify_add_watch"); - exit(1); - } + /* add a watcher on the file */ + wd = inotify_add_watch(fd, path, mask); + if (wd < 0) { + perror("inotify_add_watch"); + exit(1); + } - add_node(wd, path); - nb++; + add_node(wd, path); + nb++; - return wd; + return wd; } - int + int main (int argc, char **argv) { - int fd, len, i = 0, timeout = 0, ignore = 0; - uint32_t mask = 0; - char buf[BUF_LEN]; - char *fn = NULL; - char **cmd = NULL; - struct inotify_event *ev; - - if ((argc == 2 && argv[1][0] == '-' && argv[1][1] == 'h')) usage(); - - /* get file descriptor */ - fd = inotify_init(); - if (fd < 0) - perror("inotify_init"); - - - /* parse option given. see usage() above */ - for(i = 1; (i < argc) && (argv[i][0] == '-') && !ignore; i++) { - switch (argv[i][1]) { - case 'C': mask |= IN_CREATE; break; - case 'D': mask |= IN_DELETE; break; - case 'M': mask |= IN_MODIFY; break; - case 'm': mask = atoi(argv[++i]); break; - case 'l': list_events(); break; - case 'v': verbose += 1; break; - case 'f': watch_node(fd, argv[++i], mask); break; - case 't': timeout = atoi(argv[++i]); break; - case 'e': cmd = &argv[++i]; ignore=1; break; - default: usage(); - } - } - - /* test given arguments */ - if (!timeout) { timeout = DEFAULT_CHECK; } - - if (!nb) { - while ((fn = read_filename(0)) != NULL) - watch_node(fd, fn, mask); - - free(fn); - } - - /* start looping */ - while (nb>0) { - /* get every event raised, and queue them */ - len = read(fd, buf, BUF_LEN); - if (!len || len < 0) { - perror("read"); - } - - i = 0; - - /* treat all events queued */ - while (i < len) { - - /* get events one by one */ - ev = (struct inotify_event *) &buf[i]; - - if (verbose) { - if (ev->mask & IN_IGNORED) { - printf("!\t%s\n", ev->len? ev->name: wd_name(ev->wd)); - nb--; - } - - printf("%-3u\t%s\n", ev->mask, ev->len? ev->name: wd_name(ev->wd)); - } - - /* - * Do not do anything if no command given. - * Also only execute the command if the file concerned by the event - * is the one we're watching, or if we're not looking for a specific - * file. - * - * If you don't undersand this sentence, don't worry. Me neither. - * Just trust the if(). - */ - if (cmd) { - /* OMG a new event ! Quick, raise an alert ! */ - if (!fork()) { execvpe(cmd[0], cmd, environ); } - } - - /* jump to the next one */ - i += EVENT_SIZE + ev->len; - } - /* wait before queuing events */ - sleep(timeout); - } - - return EXIT_SUCCESS; + int fd, len, i = 0, timeout = 0, ignore = 0; + uint32_t mask = 0; + char buf[BUF_LEN]; + char *fn = NULL; + char **cmd = NULL; + struct inotify_event *ev; + + if ((argc == 2 && argv[1][0] == '-' && argv[1][1] == 'h')) usage(); + + /* get file descriptor */ + fd = inotify_init(); + if (fd < 0) + perror("inotify_init"); + + + /* parse option given. see usage() above */ + for(i = 1; (i < argc) && (argv[i][0] == '-') && !ignore; i++) { + switch (argv[i][1]) { + case 'm': mask = atoi(argv[++i]); break; + case 'l': list_events(); break; + case 'v': verbose += 1; break; + case 'f': watch_node(fd, argv[++i], mask); break; + case 't': timeout = atoi(argv[++i]); break; + case 'e': cmd = &argv[++i]; ignore=1; break; + default: usage(); + } + } + + /* test given arguments */ + if (!timeout) { timeout = DEFAULT_CHECK; } + + if (!nb) { + while ((fn = read_filename(0)) != NULL) + watch_node(fd, fn, mask); + + free(fn); + } + + /* start looping */ + while (nb>0) { + /* get every event raised, and queue them */ + len = read(fd, buf, BUF_LEN); + if (!len || len < 0) { + perror("read"); + } + + i = 0; + + /* treat all events queued */ + while (i < len) { + + /* get events one by one */ + ev = (struct inotify_event *) &buf[i]; + + if (verbose) { + if (ev->mask & IN_IGNORED) { + printf("!\t%s\n", ev->len? ev->name: + wd_name(ev->wd)); + nb--; + } + + printf("%u\t%s\n", ev->mask, ev->len? + ev->name: wd_name(ev->wd)); + fflush(stdout); + } + + /* + * Do not do anything if no command given. Also only + * execute the command if the file concerned by the + * event is the one we're watching, or if we're not + * looking for a specific file. + * + * If you don't undersand this sentence, don't worry. + * Me neither. Just trust the if(). + */ + if (cmd) { + /* OMG a new event ! Quick, raise an alert ! */ + if (!fork()) { execvpe(cmd[0], cmd, environ); } + } + + /* jump to the next one */ + i += EVENT_SIZE + ev->len; + } + /* wait before queuing events */ + sleep(timeout); + } + + return EXIT_SUCCESS; }