Date: Tue, 10 Feb 1998 10:20:14 -0700 (MST) From: BSDI Customer Support <support@bsdi.com> To: cjs@netbsd.org, freebsd-hackers@FreeBSD.ORG Subject: tail -F patches [BSDI-Support-Request #47019] Message-ID: <199802101720.KAA01927@support.BSDI.COM>
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Your message regarding:
tail -F patches
was received by BSDI Support on Tuesday, 10-Feb-1998 10:20:13.
and was assigned request number 47019.
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X-Authentication-Warning: cynic.portal.ca: cjs owned process doing -bs
Date: Tue, 10 Feb 1998 09:17:37 -0800 (PST)
From: Curt Sampson <cjs@netbsd.org>
X-Sender: cjs@cynic.portal.ca
Reply-To: cjs@netbsd.org, freebsd-hackers@freebsd.org
To: freebsd-hackers@freebsd.org, support@bsdi.com
Subject: tail -F patches [BSDI-Support-Request #47019]
Message-Id: <Pine.NEB.3.96.980210090527.5139A-100000@cynic.portal.ca>
Mime-Version: 1.0
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Cc: support@bsdi.com
This was really popular with the NetBSD crowd, so I thought I'd
forward it on to you folks.
The following patches to tail(1) add a -F option which will make
it continue to follow data appended to a file even if the file is
rotated by newsyslog(8) or something similar, or truncated.
cjs
Curt Sampson cjs@portal.ca Info at http://www.portal.ca/
Internet Portal Services, Inc. Through infinite mist, software reverberates
Vancouver, BC (604) 257-9400 In code possess'd of invisible folly.
Index: forward.c
===================================================================
RCS file: /cvsroot/src/usr.bin/tail/forward.c,v
retrieving revision 1.8
diff -u -r1.8 forward.c
--- forward.c 1997/10/19 23:45:08 1.8
+++ forward.c 1998/02/09 19:21:43
@@ -91,6 +91,15 @@
{
int ch;
struct timeval second;
+ int dostat = 0;
+ struct stat statbuf;
+ off_t lastsize = 0;
+ dev_t lastdev;
+ ino_t lastino;
+
+ /* Keep track of file's previous incarnation. */
+ lastdev = sbp->st_dev;
+ lastino = sbp->st_ino;
switch(style) {
case FBYTES:
@@ -166,9 +175,11 @@
}
for (;;) {
- while ((ch = getc(fp)) != EOF)
+ while ((ch = getc(fp)) != EOF) {
+ lastsize++; /* track size changes between stats */
if (putchar(ch) == EOF)
oerr();
+ }
if (ferror(fp)) {
ierr();
return;
@@ -186,6 +197,39 @@
if (select(0, NULL, NULL, NULL, &second) == -1)
err(1, "select: %s", strerror(errno));
clearerr(fp);
+
+ if (fflag == 1)
+ continue;
+ /*
+ * We restat the original filename every five seconds. If
+ * the size is ever smaller than the last time we read it,
+ * the file has probably been truncated; if the inode or
+ * or device number are different, it has been rotated.
+ * This causes us to close it, reopen it, and continue
+ * the tail -f. If stat returns an error (say, because
+ * the file has been removed), just continue with what
+ * we've got open now.
+ */
+ if (dostat > 0) {
+ dostat -= 1;
+ } else {
+ dostat = 5;
+ if (stat(fname, &statbuf) == 0) {
+ if (statbuf.st_dev != lastdev ||
+ statbuf.st_ino != lastino ||
+ statbuf.st_size < lastsize) {
+ lastdev = statbuf.st_dev;
+ lastino = statbuf.st_ino;
+ lastsize = 0;
+ fclose(fp);
+ if ((fp = fopen(fname, "r")) == NULL)
+ err(1, "can't reopen %s: %s",
+ fname, strerror(errno));
+ } else {
+ lastsize = statbuf.st_size;
+ }
+ }
+ }
}
}
Index: tail.1
===================================================================
RCS file: /cvsroot/src/usr.bin/tail/tail.1,v
retrieving revision 1.5
diff -u -r1.5 tail.1
--- tail.1 1997/10/19 23:45:11 1.5
+++ tail.1 1998/02/09 19:21:44
@@ -44,7 +44,11 @@
.Nd display the last part of a file
.Sh SYNOPSIS
.Nm
-.Op Fl f Li | Fl r
+.Oo
+.Fl f |
+.Fl F |
+.Fl r
+.Oc
.Oo
.Fl b Ar number |
.Fl c Ar number |
@@ -93,6 +97,21 @@
The
.Fl f
option is ignored if the standard input is a pipe, but not if it is a FIFO.
+.It Fl F
+The
+.Fl F
+option is the same as the
+.Fl f
+option, except that every five seconds
+.Nm
+will check to see if the file named on the command line has been
+shortened or moved (it is considered moved if the inode or device
+number changes) and, if so, it will close
+the current file, open the filename given, print out the entire
+contents, and continue to wait for more data to be appended.
+This option is used to follow log files though rotation by
+.Xr newsyslog 8
+or similar programs.
.It Fl n Ar number
The location is
.Ar number
Index: tail.c
===================================================================
RCS file: /cvsroot/src/usr.bin/tail/tail.c,v
retrieving revision 1.5
diff -u -r1.5 tail.c
--- tail.c 1997/10/19 23:45:11 1.5
+++ tail.c 1998/02/09 19:21:44
@@ -111,8 +111,11 @@
obsolete(argv);
style = NOTSET;
- while ((ch = getopt(argc, argv, "b:c:fn:r")) != -1)
+ while ((ch = getopt(argc, argv, "Fb:c:fn:r")) != -1)
switch(ch) {
+ case 'F':
+ fflag = 2;
+ break;
case 'b':
ARG(512, FBYTES, RBYTES);
break;
@@ -136,7 +139,7 @@
argv += optind;
if (fflag && argc > 1)
- err(1, "-f option only appropriate for a single file");
+ err(1, "-f and -F options only appropriate for a single file");
/*
* If displaying in reverse, don't permit follow option, and convert
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