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/* 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;
xrun(prog_args);
}
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;
}
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