Promote inotifyd to other.

1 files changed, 126 insertions, 0 deletions

diff --git a/toys/other/inotifyd.c b/toys/other/inotifyd.c
new file mode 100644
index 00000000..59c9a50c
--- /dev/null
+++ b/toys/other/inotifyd.c
@@ -0,0 +1,126 @@
+/* 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 y
+  help
+    usage: inotifyd PROG FILE[:MASK] ...
+
+    When a filesystem event matching MASK occurs to a FILE, run PROG as:
+
+      PROG EVENTS FILE [DIRFILE]
+
+    If PROG is "-" events are sent to stdout.
+
+    This file is:
+      a  accessed    c  modified    e  metadata change  w  closed (writable)
+      r  opened      D  deleted     M  moved            0  closed (unwritable)
+      u  unmounted   o  overflow    x  unwatchable
+
+    A file in this directory is:
+      m  moved in    y  moved out   n  created          d  deleted
+
+    When x event happens for all FILEs, inotifyd exits (after waiting for PROG).
+*/
+
+#define FOR_inotifyd
+#include "toys.h"
+#include <sys/inotify.h>
+
+void inotifyd_main(void)
+{
+  struct pollfd fds;
+  char *prog_args[5], **ss = toys.optargs;
+  char *masklist ="acew0rmyndDM uox";
+
+  fds.events = POLLIN;
+
+  *prog_args = *toys.optargs;
+  prog_args[4] = 0;
+  if ((fds.fd = inotify_init()) == -1) perror_exit(0);
+
+  // Track number of watched files. First one was program to run.
+  toys.optc--;
+
+  while (*++ss) {
+    char *path = *ss, *masks = strchr(*ss, ':');
+    int i, mask = 0;
+
+    if (!masks) mask = 0xfff; // default to all
+    else{
+      *masks++ = 0;
+      for (*masks++ = 0; *masks; masks++) {
+        i = stridx(masklist, *masks);;
+        if (i == -1) error_exit("bad mask '%c'", *masks);
+        mask |= 1<<i;
+      }
+    }
+
+    // This returns increasing numbers starting from 1, which coincidentally
+    // is the toys.optargs position of the file. (0 is program to run.)
+    if (inotify_add_watch(fds.fd, path, mask) < 0) perror_exit("%s", path);
+  }
+
+  for (;;) {
+    int ret = 0, len;
+    void *buf = 0;
+    struct inotify_event *event;
+
+    // Read next event(s)
+    ret = poll(&fds, 1, -1);
+    if (ret < 0 && errno == EINTR) continue;
+    if (ret <= 0) break;
+    xioctl(fds.fd, FIONREAD, &len);
+    event = buf = xmalloc(len);
+    len = readall(fds.fd, buf, len);
+
+    // Loop through set of events.
+    for (;;) {
+      int left = len - (((char *)event)-(char *)buf),
+          size = sizeof(struct inotify_event);
+
+      // Don't dereference event if ->len is off end of bufer
+      if (left >= size) size += event->len;
+      if (left < size) break;
+
+      if (event->mask) {
+        char *s = toybuf, *m;
+
+        for (m = masklist; *m; m++)
+          if (event->mask & (1<<(m-masklist))) *s++ = *m;
+        *s = 0;
+
+        if (**prog_args == '-' && !prog_args[0][1]) {
+          xprintf("%s\t%s\t%s\n" + 3*!event->len, toybuf,
+              toys.optargs[event->wd], event->name);
+        } else {
+          prog_args[1] = toybuf;
+          prog_args[2] = toys.optargs[event->wd];
+          prog_args[3] = event->len ? event->name : 0;
+          xpclose(xpopen(prog_args, 0), 0);
+        }
+
+        if (event->mask & IN_IGNORED) {
+          if (--toys.optc <= 0) {
+            free(buf);
+
+            goto done;
+          }
+          inotify_rm_watch(fds.fd, event->wd);
+        }
+      }
+      event = (void*)(size + (char*)event);
+    }
+    free(buf);
+  }
+
+done:
+  toys.exitval = !!toys.signal;
+}