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Create an fd.c entry point that is just like plain open(2) except that

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it will close VFDs if necessary to surmount ENFILE or EMFILE failures.
Make use of this in md.c, xlog.c, and user.c routines that were
formerly vulnerable to these failures.  In particular, this should
handle failures of mdblindwrt() that have been observed under heavy
load conditions.  (By golly, every other process on the system may
crash after Postgres eats up all the kernel FDs, but Postgres will
keep going!)
This commit is contained in:
Tom Lane
2000-06-02 03:58:34 +00:00
parent 60b941f9a4
commit b659ab07a2
5 changed files with 72 additions and 99 deletions
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10
src/backend/commands/user.c
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@ -6,7 +6,7 @@
* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Header: /cvsroot/pgsql/src/backend/commands/user.c,v 1.56 2000/05/30 00:49:44 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/commands/user.c,v 1.57 2000/06/02 03:58:33 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -146,13 +146,13 @@ write_password_file(Relation rel)
/*
* Create a flag file the postmaster will detect the next time it
* tries to authenticate a user. The postmaster will know to reload
* the pg_pwd file contents. Note: we used to elog(ERROR) if the
* creat() call failed, but it's a little silly to abort the transaction
* the pg_pwd file contents. Note: we used to elog(ERROR) if the file
* creation failed, but it's a little silly to abort the transaction
* at this point, so let's just make it a NOTICE.
*/
filename = crypt_getpwdreloadfilename();
flagfd = creat(filename, S_IRUSR | S_IWUSR);
if (flagfd == -1)
flagfd = BasicOpenFile(filename, O_WRONLY | O_CREAT, 0600);
if (flagfd < 0)
elog(NOTICE, "%s: %m", filename);
else
close(flagfd);