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Richard M. Stallman 1991-07-25 05:31:52 +00:00
parent 9b7828a5ad
commit 06000e3c72
1 changed files with 22 additions and 1 deletions
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23
lib-src/movemail.c
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@ -144,6 +144,27 @@ main (argc, argv)
#ifndef MAIL_USE_FLOCK
/* Use a lock file named /usr/spool/mail/$USER.lock:
If it exists, the mail file is locked. */
/* Note: this locking mechanism is *required* by the mailer
(on systems which use it) to prevent loss of mail.
On systems that use a lock file, extracting the mail without locking
WILL occasionally cause loss of mail due to timing errors!
So, if creation of the lock file fails
due to access permission on /usr/spool/mail,
you simply MUST change the permission
and/or make movemail a setgid program
so it can create lock files properly.
You might also wish to verify that your system is one
which uses lock files for this purpose. Some systems use other methods.
If your system uses the `flock' system call for mail locking,
define MAIL_USE_FLOCK in config.h or the s-*.h file
and recompile movemail. If the s- file for your system
should define MAIL_USE_FLOCK but does not, send a bug report
to bug-gnu-emacs@prep.ai.mit.edu so we can fix it. */
lockname = concat (inname, ".lock", "");
strcpy (tempname, inname);
p = tempname + strlen (tempname);
@ -160,7 +181,7 @@ main (argc, argv)
/* Give up if cannot do that. */
desc = open (tempname, O_WRONLY | O_CREAT, 0666);
if (desc < 0)
pfatal_with_name (concat ("temporary file \"", tempname, "\""));
pfatal_with_name ("lock file--see source file etc/movemail.c");
close (desc);
tem = link (tempname, lockname);