Date: Sat, 24 Nov 2001 12:00:02 -0800 (PST) From: Maxim Konovalov <maxim@macomnet.ru> To: freebsd-bugs@FreeBSD.org Subject: Re: bin/24955:/usr/bin/tail -F in 4.1+ doesn't work if file inode changes (works in 4.0) Message-ID: <200111242000.fAOK02P75776@freefall.freebsd.org>
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The following reply was made to PR bin/24955; it has been noted by GNATS.
From: Maxim Konovalov <maxim@macomnet.ru>
To: Ian Dowse <iedowse@maths.tcd.ie>
Cc: freebsd-gnats-submit@FreeBSD.org
Subject: Re: bin/24955:/usr/bin/tail -F in 4.1+ doesn't work if file inode
changes (works in 4.0)
Date: Sat, 24 Nov 2001 22:43:09 +0300 (MSK)
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--0-1268137247-1006630989=:87876
Content-Type: TEXT/PLAIN; charset=US-ASCII
Hello Ian,
Here is the final patch. I attached a cumulative patch which includes
the changes below and changes for WARNS?=2.
Index: forward.c
===================================================================
RCS file: /home/ncvs/src/usr.bin/tail/forward.c,v
retrieving revision 1.27
diff -u -r1.27 forward.c
--- forward.c 1 Sep 2001 22:22:44 -0000 1.27
+++ forward.c 24 Nov 2001 19:06:28 -0000
@@ -94,10 +94,11 @@
off_t off;
struct stat *sbp;
{
- int ch, kq = -1;
+ int ch, n, kq = -1;
int action = USE_SLEEP;
struct kevent ev[2];
struct stat sb2;
+ struct timespec ts;
switch(style) {
case FBYTES:
@@ -193,9 +194,10 @@
clearerr(fp);
switch (action) {
- case ADD_EVENTS: {
- int n = 0;
- struct timespec ts = { 0, 0 };
+ case ADD_EVENTS:
+ n = 0;
+ ts.tv_sec = 0;
+ ts.tv_nsec = 0;
if (Fflag && fileno(fp) != STDIN_FILENO) {
EV_SET(&ev[n], fileno(fp), EVFILT_VNODE,
@@ -208,24 +210,27 @@
n++;
if (kevent(kq, ev, n, NULL, 0, &ts) < 0) {
- close(kq);
- kq = -1;
action = USE_SLEEP;
} else {
action = USE_KQUEUE;
}
break;
- }
case USE_KQUEUE:
- if (kevent(kq, NULL, 0, ev, 1, NULL) < 0)
+ ts.tv_sec = 1;
+ ts.tv_nsec = 0;
+ /*
+ * In the -F case we set a timeout to ensure that
+ * we re-stat the file at least once every second.
+ */
+ n = kevent(kq, NULL, 0, ev, 1, Fflag ? &ts : NULL);
+ if (n < 0)
err(1, "kevent");
-
- if (ev->filter == EVFILT_VNODE) {
- /* file was rotated, wait until it reappears */
- action = USE_SLEEP;
- } else if (ev->data < 0) {
- /* file shrank, reposition to end */
+ if (n == 0) {
+ /* timeout */
+ break;
+ } else if (ev->filter == EVFILT_READ && ev->data < 0) {
+ /* file shrank, reposition to end */
if (fseeko(fp, (off_t)0, SEEK_END) == -1) {
ierr();
return;
@@ -236,26 +241,25 @@
case USE_SLEEP:
(void) usleep(250000);
clearerr(fp);
+ break;
+ }
- if (Fflag && fileno(fp) != STDIN_FILENO &&
- stat(fname, &sb2) != -1) {
- if (sb2.st_ino != sbp->st_ino ||
- sb2.st_dev != sbp->st_dev ||
- sb2.st_rdev != sbp->st_rdev ||
- sb2.st_nlink == 0) {
- fp = freopen(fname, "r", fp);
- if (fp == NULL) {
- ierr();
- break;
- }
+ if (Fflag && fileno(fp) != STDIN_FILENO) {
+ while (stat(fname, &sb2) != 0)
+ /* file was rotated, wait until it reappears */
+ (void)sleep(1);
+ if (sb2.st_ino != sbp->st_ino ||
+ sb2.st_dev != sbp->st_dev ||
+ sb2.st_rdev != sbp->st_rdev ||
+ sb2.st_nlink == 0) {
+ fp = freopen(fname, "r", fp);
+ if (fp == NULL) {
+ ierr();
+ } else {
*sbp = sb2;
- if (kq != -1)
- action = ADD_EVENTS;
- } else if (kq != -1) {
- action = USE_KQUEUE;
+ action = ADD_EVENTS;
}
}
- break;
}
}
}
- -maxim
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