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Avoid generating a corrupt history file if multiple ksh exit together. 

Fixes PR/28912
This commit is contained in:
dsl 2009-10-31 21:54:01 +00:00
parent 3b8f95158f
commit b392d5450b
1 changed files with 11 additions and 4 deletions
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15
bin/ksh/history.c
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@ -1,4 +1,4 @@
/* $NetBSD: history.c,v 1.9 2005/06/26 19:09:00 christos Exp $ */
/* $NetBSD: history.c,v 1.10 2009/10/31 21:54:01 dsl Exp $ */
/*
* command history
@ -19,7 +19,7 @@
#include <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: history.c,v 1.9 2005/06/26 19:09:00 christos Exp $");
__RCSID("$NetBSD: history.c,v 1.10 2009/10/31 21:54:01 dsl Exp $");
#endif
@ -740,20 +740,27 @@ void
hist_finish()
{
static int once;
int fd;
FILE *fh;
register int i;
register char **hp;
if (once++)
return;
if (hname == NULL || hname[0] == 0)
return;
/* check how many we have */
i = histptr - histlist;
if (i >= histsize)
hp = &histptr[-histsize];
else
hp = histlist;
if (hname && (fh = fopen(hname, "w")))
{
fd = open(hname, O_WRONLY | O_CREAT | O_TRUNC | O_EXLOCK, 0777);
/* Remove anything written before we got the lock */
ftruncate(fd, 0);
if (fd >= 0 && (fh = fdopen(fd, "w"))) {
for (i = 0; hp + i <= histptr && hp[i]; i++)
fprintf(fh, "%s%c", hp[i], '\0');
fclose(fh);