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inotifyd: exit if x event happened for all files

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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
This commit is contained in:
Denis Vlasenko 2008-11-20 01:24:39 +00:00
parent 4ae1e13d3f
commit 9a4c0d59a7
2 changed files with 36 additions and 22 deletions
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16
include/usage.h
View File

@ -1838,16 +1838,11 @@
" ::shutdown:/sbin/swapoff -a\n"
#define inotifyd_trivial_usage \
"/user/space/agent dir/or/file/being/watched[:mask] ..."
"PROG FILE1[:MASK] ..."
#define inotifyd_full_usage "\n\n" \
"Run userspace agent on filesystem changes." \
"\nWhen a filesystem event matching the mask occurs" \
"\non specified file /user/space/agent is run" \
"\nwith the parameters:" \
"\n1. actual event(s)" \
"\n2. file name" \
"\n3. name of subfile (if any)" \
"\ninotifyd waits for agent to exit." \
"Run PROG on filesystem changes." \
"\nWhen a filesystem event matching MASK occurs on FILEn," \
"\nPROG <actual_event(s)> <FILEn> [<subfile_name>] is run." \
"\nEvents:" \
"\n a File is accessed" \
"\n c File is modified" \
@ -1865,6 +1860,9 @@
"\n y Subfile is moved out of dir" \
"\n n Subfile is created" \
"\n d Subfile is deleted" \
"\n" \
"\ninotifyd waits for PROG to exit." \
"\nWhen x event happens for all FILEs, inotifyd exits" \
#define insmod_trivial_usage \
USE_FEATURE_2_4_MODULES("[OPTION]... ") "MODULE [symbol=value]..."

42
miscutils/inotifyd.c
View File

@ -44,6 +44,7 @@ static const char mask_names[] ALIGN1 =
"D" // 0x00000400 Self was deleted
"M" // 0x00000800 Self was moved
"\0" // 0x00001000 (unused)
// Kernel events, always reported:
"u" // 0x00002000 Backing fs was unmounted
"o" // 0x00004000 Event queued overflowed
"x" // 0x00008000 File is no longer watched (usually deleted)
@ -56,27 +57,38 @@ extern int inotify_init(void);
extern int inotify_add_watch(int fd, const char *path, uint32_t mask);
int inotifyd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int inotifyd_main(int argc UNUSED_PARAM, char **argv)
int inotifyd_main(int argc, char **argv)
{
int n;
unsigned mask = IN_ALL_EVENTS; // assume we want all events
unsigned mask;
struct pollfd pfd;
char **watched = ++argv; // watched name list
const char *args[] = { *argv, NULL, NULL, NULL, NULL };
char **watches; // names of files being watched
const char *args[5];
// sanity check: agent and at least one watch must be given
if (!argv[0] || !argv[1])
if (!argv[1] || !argv[2])
bb_show_usage();
argv++;
// inotify_add_watch will number watched files
// starting from 1, thus watches[0] is unimportant,
// and 1st file name is watches[1].
watches = argv;
args[0] = *argv;
args[4] = NULL;
argc -= 2; // number of files we watch
// open inotify
pfd.fd = inotify_init();
if (pfd.fd < 0)
bb_perror_msg_and_die("no kernel support");
// setup watched
// setup watches
while (*++argv) {
char *path = *argv;
char *masks = strchr(path, ':');
mask = 0x0fff; // assuming we want all non-kernel events
// if mask is specified ->
if (masks) {
*masks = '\0'; // split path and mask
@ -102,10 +114,9 @@ int inotifyd_main(int argc UNUSED_PARAM, char **argv)
// do watch
pfd.events = POLLIN;
while (1) {
ssize_t len;
int len;
void *buf;
struct inotify_event *ie;
again:
if (bb_got_signal)
break;
@ -124,6 +135,7 @@ int inotifyd_main(int argc UNUSED_PARAM, char **argv)
break;
// read out all pending events
// (NB: len must be int, not ssize_t or long!)
xioctl(pfd.fd, FIONREAD, &len);
#define eventbuf bb_common_bufsiz1
ie = buf = (len <= sizeof(eventbuf)) ? eventbuf : xmalloc(len);
@ -142,11 +154,15 @@ int inotifyd_main(int argc UNUSED_PARAM, char **argv)
}
*s = '\0';
// bb_error_msg("exec %s %08X\t%s\t%s\t%s", args[0],
// ie->mask, events, watched[ie->wd], ie->len ? ie->name : "");
// ie->mask, events, watches[ie->wd], ie->len ? ie->name : "");
args[1] = events;
args[2] = watched[ie->wd];
args[2] = watches[ie->wd];
args[3] = ie->len ? ie->name : NULL;
wait4pid(xspawn((char **)args));
// we are done if all files got final x event
if (ie->mask & 0x8000)
if (--argc <= 0)
goto done;
}
// next event
i = sizeof(struct inotify_event) + ie->len;
@ -155,7 +171,7 @@ int inotifyd_main(int argc UNUSED_PARAM, char **argv)
}
if (eventbuf != buf)
free(buf);
}
return EXIT_SUCCESS;
} // while (1)
done:
return bb_got_signal;
}