/*
* Wait for file to become accessible and register a kevent to watch it
*/
void
watch_file(int kq, WatchFile *file) {
struct kevent evSet;
int i;
struct timespec delay = { 0, 100 * 1000000 };
/* wait up to 1 second for file to become available */
for (i=0; i < 10; i++) {
#ifdef O_EVTONLY
file->fd = xopen(file->fn, O_RDONLY|O_EVTONLY);
#else
file->fd = xopen(file->fn, O_RDONLY);
#endif
if (file->fd == -1) nanosleep(&delay, NULL);
else break;
}
if (file->fd == -1)
err(1, "cannot open '%s'", file->fn);
EV_SET(&evSet, file->fd, EVFILT_VNODE, EV_ADD | EV_CLEAR, NOTE_ALL, 0,
file);
if (xkevent(kq, &evSet, 1, NULL, 0, NULL) == -1) {
if (errno == ENOSPC)
errx(1, "Unable to allocate memory for kernel queue."
" Please consult"
" http://entrproject.org/limits.html");
else
err(1, "failed to register VNODE event");
}
}
/*
* Wait for file to become accessible and register a kevent to watch it
*/
void
watch_file(int kq, WatchFile *file) {
struct kevent evSet;
int i;
struct timespec delay = { 0, 100 * 1000000 };
/* wait up to 1 second for file to become available */
for (i=0; i < 10; i++) {
#ifdef O_EVTONLY
file->fd = xopen(file->fn, O_RDONLY|O_EVTONLY);
#else
file->fd = xopen(file->fn, O_RDONLY);
#endif
if (file->fd == -1) nanosleep(&delay, NULL);
else break;
}
if (file->fd == -1)
err(1, "cannot open `%s'", file->fn);
EV_SET(&evSet, file->fd, EVFILT_VNODE, EV_ADD | EV_CLEAR, NOTE_ALL, 0,
file);
if (xkevent(kq, &evSet, 1, NULL, 0, NULL) == -1)
err(1, "failed to register VNODE event");
}
/*
* Wait for events to and execute a command. Four major concerns are in play:
* leading_edge: Global reference to the first file to have changed
* reopen_only : Unlink or rename events which require us to spin while
* waiting for the file to reappear. These must always be
* processed
* collate_only: Changes that indicate that more events are likely to occur.
* Watch for more events using a short timeout
* do_exec : Delay execution until all events have been processed. Allow
* the user to edit files while the utility is running without
* any visible side-effects
* dir_modified: The number of files changed for a directory under watch
*/
void
watch_loop(int kq, char *argv[]) {
struct kevent evSet;
struct kevent evList[32];
int nev;
WatchFile *file;
int i;
struct timespec evTimeout = { 0, 1000000 };
int reopen_only = 0;
int collate_only = 0;
int do_exec = 0;
int dir_modified = 0;
int leading_edge_set = 0;
struct stat sb;
leading_edge = files[0]; /* default */
if (postpone_opt == 0)
run_utility(argv);
main:
if ((reopen_only == 1) || (collate_only == 1))
nev = xkevent(kq, NULL, 0, evList, 32, &evTimeout);
else {
nev = xkevent(kq, NULL, 0, evList, 32, NULL);
dir_modified = 0;
}
/* escape for test runner */
if ((nev == -2) && (collate_only == 0))
return;
for (i=0; i<nev; i++) {
if (evList[i].filter != EVFILT_VNODE)
continue;
file = (WatchFile *)evList[i].udata;
if (file->is_dir == 1)
dir_modified += compare_dir_contents(file);
else if (leading_edge_set == 0)
if ((reopen_only == 0) && (collate_only == 0)) {
leading_edge = file;
leading_edge_set = 1;
}
}
collate_only = 0;
for (i=0; i<nev; i++) {
file = (WatchFile *)evList[i].udata;
if (evList[i].fflags & NOTE_DELETE ||
evList[i].fflags & NOTE_RENAME) {
EV_SET(&evSet, file->fd, EVFILT_VNODE, EV_DELETE,
NOTE_ALL, 0, file);
if (xkevent(kq, &evSet, 1, NULL, 0, NULL) == -1)
err(1, "failed to remove VNODE event");
if ((file->fd != -1) && (close(file->fd) == -1))
err(1, "unable to close file");
watch_file(kq, file);
collate_only = 1;
}
}
if (reopen_only == 1) {
reopen_only = 0;
goto main;
}
for (i=0; i<nev && reopen_only == 0; i++) {
file = (WatchFile *)evList[i].udata;
if ((file->is_dir == 1) && (dir_modified == 0))
continue;
if (evList[i].fflags & NOTE_DELETE ||
evList[i].fflags & NOTE_WRITE ||
evList[i].fflags & NOTE_RENAME ||
evList[i].fflags & NOTE_TRUNCATE) {
if ((dir_modified > 0) && (restart_opt == 1))
continue;
do_exec = 1;
}
if (evList[i].fflags & NOTE_ATTRIB &&
S_ISREG(file->mode) != 0 &&
xstat(file->fn, &sb) == 0 &&
file->mode != sb.st_mode) {
do_exec = 1;
file->mode = sb.st_mode;
}
}
if (collate_only == 1)
goto main;
if (do_exec == 1) {
do_exec = 0;
run_utility(argv);
reopen_only = 1;
leading_edge_set = 0;
}
if (dir_modified > 0) {
terminate_utility();
xerrx(2, "directory altered");
}
goto main;
}
/*
* Wait for events to and execute a command or write filename to a FIFO.
* Four major concerns are in play here:
* leading_edge: Global reference to the first file to have changed
* reopen_only : Unlink or rename events which require us to spin while
* waiting for the file to reappear. These must always be
* processed
* collate_only: Changes that indicate that more events are likely to occur.
* Watch for more events using a short timeout
* do_exec : Delay execution until all events have been processed. Allow
* the user to edit files while the utility is running without
* any visible side-effects
* dir_modified: The number of files changed for a directory under watch
*/
void
watch_loop(int kq, char *argv[]) {
struct kevent evSet;
struct kevent evList[32];
int nev;
WatchFile *file;
int i;
struct timespec evTimeout = { 0, 1000000 };
int reopen_only = 0;
int collate_only = 0;
int do_exec = 0;
int dir_modified = 0;
leading_edge = files[0]; /* default */
if (restart_opt)
run_utility(argv);
main:
if ((reopen_only == 1) || (collate_only == 1))
nev = xkevent(kq, NULL, 0, evList, 32, &evTimeout);
else {
nev = xkevent(kq, NULL, 0, evList, 32, NULL);
dir_modified = 0;
}
/* escape for test runner */
if ((nev == -2) && (collate_only == 0))
return;
for (i=0; i<nev; i++) {
#ifdef DEBUG
fprintf(stderr, "event %d/%d: ident %d filter %d flags 0x%x "
"fflags 0x%x udata %d udata %p\n", i+1,
nev,
evList[i].ident,
evList[i].filter,
evList[i].flags,
evList[i].fflags,
evList[i].data,
evList[i].udata);
#endif
if (evList[i].filter != EVFILT_VNODE)
continue;
file = (WatchFile *)evList[i].udata;
if (file->is_dir == 1)
dir_modified += compare_dir_contents(file);
if ((i == 0) && (reopen_only == 0) && (collate_only == 0))
leading_edge = file;
}
collate_only = 0;
for (i=0; i<nev; i++) {
file = (WatchFile *)evList[i].udata;
if (evList[i].fflags & NOTE_DELETE ||
evList[i].fflags & NOTE_RENAME) {
EV_SET(&evSet, file->fd, EVFILT_VNODE, EV_DELETE,
NOTE_ALL, 0, file);
if (xkevent(kq, &evSet, 1, NULL, 0, NULL) == -1)
err(1, "failed to remove VNODE event");
if ((file->fd != -1) && (close(file->fd) == -1))
err(1, "unable to close file");
watch_file(kq, file);
collate_only = 1;
}
}
if (reopen_only == 1) {
reopen_only = 0;
goto main;
}
for (i=0; i<nev && reopen_only == 0; i++) {
file = (WatchFile *)evList[i].udata;
if ((file->is_dir == 1) && (dir_modified == 0))
continue;
if (evList[i].fflags & NOTE_DELETE ||
evList[i].fflags & NOTE_WRITE ||
evList[i].fflags & NOTE_RENAME ||
evList[i].fflags & NOTE_TRUNCATE) {
if (fifo.fd == 0) {
if ((dir_modified > 0) && (restart_opt == 1))
continue;
do_exec = 1;
}
else {
write(fifo.fd, file->fn, strlen(file->fn));
write(fifo.fd, "\n", 1);
fsync(fifo.fd);
reopen_only = 1;
}
}
}
if (collate_only == 1)
goto main;
if (do_exec == 1) {
do_exec = 0;
run_utility(argv);
reopen_only = 1;
}
if (dir_modified > 0)
xerrx(2, "directory altered");
goto main;
}
