Author: jilles
Date: Tue Jan 25 23:02:25 2011
New Revision: 217863
URL: http://svn.freebsd.org/changeset/base/217863
Log:
MFC r217133: sed: Try hard links to make -i target available continually.
When creating a backup file, sed renamed the original before renaming the
changed copy into place, leading to a short time when no file with the
original name was present (usually only visible on SMP systems). Try
creating the backup file using a hard link instead, avoiding this problem.
If creating the hard link fails for any reason, fall back to the old rename
method.
When not creating a backup file, sed already renamed the changed copy onto
the original. This remains unchanged.
PR: bin/153261
Submitted by: Pedro F. Giffuni
Reviewed by: dds (older version)
Obtained from: Illumos
Modified:
stable/8/usr.bin/sed/main.c
Directory Properties:
stable/8/usr.bin/sed/ (props changed)
Modified: stable/8/usr.bin/sed/main.c
==============================================================================
--- stable/8/usr.bin/sed/main.c Tue Jan 25 22:55:50 2011 (r217862)
+++ stable/8/usr.bin/sed/main.c Tue Jan 25 23:02:25 2011 (r217863)
@@ -338,18 +338,35 @@ mf_fgets(SPACE *sp, enum e_spflag spflag
if (infile != NULL) {
fclose(infile);
if (*oldfname != '\0') {
- if (rename(fname, oldfname) != 0) {
+ /* if there was a backup file, remove it */
+ unlink(oldfname);
+ /*
+ * Backup the original. Note that hard links
+ * are not supported on all filesystems.
+ */
+ if ((link(fname, oldfname) != 0) &&
+ (rename(fname, oldfname) != 0)) {
warn("rename()");
- unlink(tmpfname);
+ if (*tmpfname)
+ unlink(tmpfname);
exit(1);
}
*oldfname = '\0';
}
if (*tmpfname != '\0') {
if (outfile != NULL && outfile != stdout)
- fclose(outfile);
+ if (fclose(outfile) != 0) {
+ warn("fclose()");
+ unlink(tmpfname);
+ exit(1);
+ }
outfile = NULL;
- rename(tmpfname, fname);
+ if (rename(tmpfname, fname) != 0) {
+ /* this should not happen really! */
+ warn("rename()");
+ unlink(tmpfname);
+ exit(1);
+ }
*tmpfname = '\0';
}
outfname = NULL;
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