tMake wendy export environment variables - wendy - watch files/directories and run commands on any event
HTML git clone git://z3bra.org/wendy
DIR Log
DIR Files
DIR Refs
DIR README
DIR LICENSE
---
DIR commit f9a2ff5a697cc95c4ef10d2235b4bb5ed3f25353
DIR parent 9a2882780b14d4b6118b2a34c2deaca37e3ee6a9
HTML Author: z3bra <willyatmailoodotorg>
Date: Sun, 31 Jan 2016 16:21:08 +0100
Make wendy export environment variables
When an event is triggered, and a command is specified, wendy will
export two variables in the environments: WENDY_INODE and WENDY_EVENT.
These two variables will inherit the name ofr the node that triggered
tthe event, and the numeric value of this event.
Diffstat:
M wendy.c | 45 +++++++++++++++++++++++--------
1 file changed, 34 insertions(+), 11 deletions(-)
---
DIR diff --git a/wendy.c b/wendy.c
t@@ -10,10 +10,22 @@
/* definitions, defaults, bla bla blah */
#define EVENT_SIZE (sizeof(struct inotify_event))
+
/* maximum number of event * queuing at the same time */
#define BUF_LEN (512 * (EVENT_SIZE+16))
-#define DEFAULT_CHECK 1 /* defaults to 1 second */
+/* macro used to retrieve the path of the node triggering the event */
+#define EVENT_PATH(e) (e->len ? e->name : wd_path(e->wd))
+
+/* environment variable names set by wendy to pass to the command */
+#define ENV_PATH "WENDY_INODE"
+#define ENV_MASK "WENDY_EVENT"
+
+/* default value for the mask when -m is not specified */
+#define DEFAULT_MASK (IN_CLOSE_WRITE|IN_MODIFY)
+
+/* timeout value used by default to queue the events */
+#define DEFAULT_TIMEOUT 1
struct node_t {
int wd;
t@@ -120,7 +132,7 @@ add_node(int wd, const char *path)
}
const char *
-wd_name(int wd)
+wd_path(int wd)
{
struct node_t *n = head;
t@@ -155,8 +167,8 @@ watch_node(int fd, const char *path, uint32_t mask)
main (int argc, char **argv)
{
int fd, len, i = 0, timeout = 0;
- uint32_t mask = IN_CLOSE_WRITE;
- char buf[BUF_LEN];
+ uint32_t mask = DEFAULT_MASK;
+ char buf[BUF_LEN], strmask[8];
char *fn = NULL, *argv0 = NULL;
char **cmd = NULL;
struct inotify_event *ev;
t@@ -192,7 +204,7 @@ main (int argc, char **argv)
cmd = argv;
/* test given arguments */
- if (!timeout) { timeout = DEFAULT_CHECK; }
+ if (!timeout) { timeout = DEFAULT_TIMEOUT; }
if (!nb) {
while ((fn = read_filename(0)) != NULL)
t@@ -218,14 +230,19 @@ main (int argc, char **argv)
ev = (struct inotify_event *) &buf[i];
if (verbose) {
+ /*
+ * IN_IGNORED is triggered when a file watched
+ * doesn't exists anymore. In this case we
+ * decrement the number of files watched so
+ * that if there is none remaining, wendy will
+ * terminate.
+ */
if (ev->mask & IN_IGNORED) {
- printf("!!\t%s/%s\n", wd_name(ev->wd),
- ev->len? ev->name: "");
+ fprintf(stderr, "%s: removing watch\n", EVENT_PATH(ev));
nb--;
+ } else {
+ printf("%u\t%s\n", ev->mask, EVENT_PATH(ev));
}
-
- printf("%u\t%s/%s\n", ev->mask, wd_name(ev->wd),
- ev->len? ev->name: "");
fflush(stdout);
}
t@@ -241,8 +258,13 @@ main (int argc, char **argv)
if (cmd) {
/*
* OMG a new event! raise an alert!
+ * We first add two variables to the environment
+ * and then run the command.
* Also, double-forking.
*/
+ snprintf(strmask, 8, "%d", ev->mask);
+ setenv(ENV_MASK, strmask, 1);
+ setenv(ENV_PATH, EVENT_PATH(ev), 1);
if (!fork())
if (!fork()) execvpe(cmd[0], cmd, environ);
else exit(0);
t@@ -253,7 +275,8 @@ main (int argc, char **argv)
i += EVENT_SIZE + ev->len;
}
/* wait before queuing events */
- sleep(timeout);
+ if (nb > 0)
+ sleep(timeout);
}
return EXIT_SUCCESS;