inotifyd: exit if x event happened for all files
fix FIONREAD parameter type fix default mask code shrink help text function old new delta inotifyd_main 497 506 +9 packed_usage 25446 25431 -15 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 1/1 up/down: 9/-15) Total: -6 bytes
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@ -1838,16 +1838,11 @@
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" ::shutdown:/sbin/swapoff -a\n"
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#define inotifyd_trivial_usage \
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"/user/space/agent dir/or/file/being/watched[:mask] ..."
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"PROG FILE1[:MASK] ..."
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#define inotifyd_full_usage "\n\n" \
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"Run userspace agent on filesystem changes." \
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"\nWhen a filesystem event matching the mask occurs" \
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"\non specified file /user/space/agent is run" \
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"\nwith the parameters:" \
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"\n1. actual event(s)" \
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"\n2. file name" \
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"\n3. name of subfile (if any)" \
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"\ninotifyd waits for agent to exit." \
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"Run PROG on filesystem changes." \
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"\nWhen a filesystem event matching MASK occurs on FILEn," \
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"\nPROG <actual_event(s)> <FILEn> [<subfile_name>] is run." \
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"\nEvents:" \
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"\n a File is accessed" \
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"\n c File is modified" \
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@ -1865,6 +1860,9 @@
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"\n y Subfile is moved out of dir" \
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"\n n Subfile is created" \
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"\n d Subfile is deleted" \
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"\n" \
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"\ninotifyd waits for PROG to exit." \
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"\nWhen x event happens for all FILEs, inotifyd exits" \
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#define insmod_trivial_usage \
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USE_FEATURE_2_4_MODULES("[OPTION]... ") "MODULE [symbol=value]..."
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@ -44,6 +44,7 @@ static const char mask_names[] ALIGN1 =
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"D" // 0x00000400 Self was deleted
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"M" // 0x00000800 Self was moved
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"\0" // 0x00001000 (unused)
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// Kernel events, always reported:
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"u" // 0x00002000 Backing fs was unmounted
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"o" // 0x00004000 Event queued overflowed
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"x" // 0x00008000 File is no longer watched (usually deleted)
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@ -56,27 +57,38 @@ extern int inotify_init(void);
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extern int inotify_add_watch(int fd, const char *path, uint32_t mask);
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int inotifyd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int inotifyd_main(int argc UNUSED_PARAM, char **argv)
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int inotifyd_main(int argc, char **argv)
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{
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int n;
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unsigned mask = IN_ALL_EVENTS; // assume we want all events
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unsigned mask;
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struct pollfd pfd;
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char **watched = ++argv; // watched name list
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const char *args[] = { *argv, NULL, NULL, NULL, NULL };
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char **watches; // names of files being watched
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const char *args[5];
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// sanity check: agent and at least one watch must be given
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if (!argv[0] || !argv[1])
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if (!argv[1] || !argv[2])
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bb_show_usage();
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argv++;
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// inotify_add_watch will number watched files
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// starting from 1, thus watches[0] is unimportant,
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// and 1st file name is watches[1].
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watches = argv;
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args[0] = *argv;
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args[4] = NULL;
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argc -= 2; // number of files we watch
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// open inotify
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pfd.fd = inotify_init();
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if (pfd.fd < 0)
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bb_perror_msg_and_die("no kernel support");
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// setup watched
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// setup watches
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while (*++argv) {
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char *path = *argv;
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char *masks = strchr(path, ':');
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mask = 0x0fff; // assuming we want all non-kernel events
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// if mask is specified ->
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if (masks) {
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*masks = '\0'; // split path and mask
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@ -102,10 +114,9 @@ int inotifyd_main(int argc UNUSED_PARAM, char **argv)
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// do watch
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pfd.events = POLLIN;
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while (1) {
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ssize_t len;
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int len;
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void *buf;
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struct inotify_event *ie;
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again:
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if (bb_got_signal)
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break;
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@ -124,6 +135,7 @@ int inotifyd_main(int argc UNUSED_PARAM, char **argv)
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break;
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// read out all pending events
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// (NB: len must be int, not ssize_t or long!)
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xioctl(pfd.fd, FIONREAD, &len);
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#define eventbuf bb_common_bufsiz1
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ie = buf = (len <= sizeof(eventbuf)) ? eventbuf : xmalloc(len);
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@ -142,11 +154,15 @@ int inotifyd_main(int argc UNUSED_PARAM, char **argv)
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}
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*s = '\0';
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// bb_error_msg("exec %s %08X\t%s\t%s\t%s", args[0],
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// ie->mask, events, watched[ie->wd], ie->len ? ie->name : "");
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// ie->mask, events, watches[ie->wd], ie->len ? ie->name : "");
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args[1] = events;
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args[2] = watched[ie->wd];
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args[2] = watches[ie->wd];
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args[3] = ie->len ? ie->name : NULL;
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wait4pid(xspawn((char **)args));
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// we are done if all files got final x event
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if (ie->mask & 0x8000)
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if (--argc <= 0)
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goto done;
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}
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// next event
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i = sizeof(struct inotify_event) + ie->len;
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@ -155,7 +171,7 @@ int inotifyd_main(int argc UNUSED_PARAM, char **argv)
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}
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if (eventbuf != buf)
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free(buf);
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}
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return EXIT_SUCCESS;
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} // while (1)
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done:
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return bb_got_signal;
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}
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