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authorAshwini Sharma <ak.ashwini1981@gmail.com>2014-05-23 08:58:08 -0500
committerAshwini Sharma <ak.ashwini1981@gmail.com>2014-05-23 08:58:08 -0500
commit6958429d84cff06fefdc898d837a71c239f1e214 (patch)
tree932ddbb913299fcceee2535db6cb0826d42f37cf
parenta76175cbdaf4878491deadd68860b07c8d4846ff (diff)
downloadtoybox-6958429d84cff06fefdc898d837a71c239f1e214.tar.gz
inotifyd - watch for filesystem events.
-rw-r--r--toys/pending/inotifyd.c176
1 files changed, 176 insertions, 0 deletions
diff --git a/toys/pending/inotifyd.c b/toys/pending/inotifyd.c
new file mode 100644
index 00000000..98de2546
--- /dev/null
+++ b/toys/pending/inotifyd.c
@@ -0,0 +1,176 @@
+/* inotifyd.c - inotify daemon.
+ *
+ * Copyright 2013 Ashwini Kumar <ak.ashwini1981@gmail.com>
+ * Copyright 2013 Kyungwan Han <asura321@gmail.com>
+ *
+ * No Standard.
+
+USE_INOTIFYD(NEWTOY(inotifyd, "<2", TOYFLAG_USR|TOYFLAG_BIN))
+
+config INOTIFYD
+ bool "inotifyd"
+ default n
+ help
+ usage: inotifyd PROG FILE[:mask] ...
+
+ Run PROG on filesystem changes.
+ When a filesystem event matching MASK occurs on FILEn,
+ PROG ACTUAL_EVENTS FILEn [SUBFILE] is run.
+ If PROG is -, events are sent to stdout.
+
+ Events:
+ a File is accessed
+ c File is modified
+ e Metadata changed
+ w Writable file is closed
+ 0 Unwritable file is closed
+ r File is opened
+ D File is deleted
+ M File is moved
+ u Backing fs is unmounted
+ o Event queue overflowed
+ x File can't be watched anymore
+ If watching a directory:
+ m Subfile is moved into dir
+ y Subfile is moved out of dir
+ n Subfile is created
+ d Subfile is deleted
+
+ inotifyd waits for PROG to exit.
+ When x event happens for all FILEs, inotifyd exits.
+*/
+#define FOR_inotifyd
+#include "toys.h"
+#include <sys/inotify.h>
+
+GLOBALS(
+ int gotsignal;
+)
+
+static void sig_handler(int sig)
+{
+ TT.gotsignal = sig;
+}
+
+static int exec_wait(char **args)
+{
+ int status = 0;
+ pid_t pid = fork();
+
+ if (!pid) xexec(args);
+ else if (pid > 0) waitpid(pid, &status, 0);
+ else perror_exit("fork");
+ return WEXITSTATUS(status);
+}
+
+void inotifyd_main(void)
+{
+ struct pollfd fds;
+ char *prog_args[5], **files, **restore;
+ struct mask_nameval {
+ char name;
+ unsigned long val;
+ } mask_nv[] = {
+ { 'a', IN_ACCESS },
+ { 'c', IN_MODIFY },
+ { 'e', IN_ATTRIB },
+ { 'w', IN_CLOSE_WRITE },
+ { '0', IN_CLOSE_NOWRITE },
+ { 'r', IN_OPEN },
+ { 'm', IN_MOVED_FROM },
+ { 'y', IN_MOVED_TO },
+ { 'n', IN_CREATE },
+ { 'd', IN_DELETE },
+ { 'D', IN_DELETE_SELF },
+ { 'M', IN_MOVE_SELF },
+ { 'u', IN_UNMOUNT },
+ { 'o', IN_Q_OVERFLOW },
+ { 'x', IN_IGNORED }
+ };
+ int mask, masks_len = ARRAY_LEN(mask_nv);
+
+ prog_args[0] = toys.optargs[0];
+ prog_args[4] = NULL;
+ toys.optc--; // 1st one is program, rest are files to be watched
+ //wd ZERO is not used, hence toys.optargs is assigned to files.
+ restore = files = toys.optargs;
+ if ((fds.fd = inotify_init()) == -1) perror_exit("initialization failed");
+
+ while (*++toys.optargs) {
+ char *path = *toys.optargs;
+ char *masks = strchr(path, ':');
+
+ mask = 0x0fff; //assuming all non-kernel events to be notified.
+ if (masks) {
+ *masks++ = '\0';
+ mask = 0;
+ while (*masks) {
+ int i = 0;
+
+ for (i = 0; i < masks_len; i++) {
+ if (*masks == mask_nv[i].name) {
+ mask |= mask_nv[i].val;
+ break;
+ }
+ }
+ if (i == masks_len) error_exit("wrong mask '%c'", *masks);
+ masks++;
+ }
+ }
+ if (inotify_add_watch(fds.fd, path, mask) < 0)
+ perror_exit("add watch '%s' failed", path);
+ }
+ toys.optargs = restore;
+ sigatexit(sig_handler);
+ fds.events = POLLIN;
+
+ while (1) {
+ int ret = 0, queue_len;
+ void *buf = NULL;
+ struct inotify_event *event;
+
+retry:
+ if (TT.gotsignal) break;
+ ret = poll(&fds, 1, -1);
+ if (ret < 0 && errno == EINTR) goto retry;
+ if (ret <= 0) break;
+ xioctl(fds.fd, FIONREAD, &queue_len);
+ event = buf = xmalloc(queue_len);
+ queue_len = readall(fds.fd, buf, queue_len);
+ while (queue_len > 0) {
+ uint32_t m = event->mask;
+
+ if (m) {
+ char evts[masks_len+1], *s = evts;
+ int i;
+
+ for (i = 0; i < masks_len; i++)
+ if (m & mask_nv[i].val) *s++ = mask_nv[i].name;
+ *s = '\0';
+
+ if (prog_args[0][0] == '-' && !prog_args[0][1]) { //stdout
+ printf(event->len ? "%s\t%s\t%s\n" : "%s\t%s\n", evts,
+ files[event->wd], event->name);
+ fflush(stdout);
+ } else {
+ prog_args[1] = evts;
+ prog_args[2] = files[event->wd];
+ prog_args[3] = event->len ? event->name : NULL;
+ exec_wait(prog_args); //exec and wait...
+ }
+ if (event->mask & IN_IGNORED) {
+ if (--toys.optc <= 0) {
+ free(buf);
+ goto done;
+ }
+ inotify_rm_watch(fds.fd, event->wd);
+ }
+ }
+ queue_len -= sizeof(struct inotify_event) + event->len;
+ event = (void*)((char*)event + sizeof(struct inotify_event) + event->len); //next event
+ }
+ free(buf);
+ }
+done:
+ toys.exitval = TT.gotsignal;
+}