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Check against errors when reading trace device. CID 4561.

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This commit is contained in:
pooka 2007-09-08 15:34:23 +00:00
parent 70a37300e4
commit 584065ec56
1 changed files with 9 additions and 2 deletions
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11
usr.sbin/isdn/isdntrace/trace.c
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@ -35,7 +35,7 @@
* trace.c - print traces of D (B) channel activity for isdn4bsd * trace.c - print traces of D (B) channel activity for isdn4bsd
* ------------------------------------------------------------- * -------------------------------------------------------------
* *
* $Id: trace.c,v 1.8 2004/03/28 20:49:22 pooka Exp $ * $Id: trace.c,v 1.9 2007/09/08 15:34:23 pooka Exp $
* *
* $FreeBSD$ * $FreeBSD$
* *
@ -393,13 +393,20 @@ main(int argc, char *argv[])
{ {
if (Popt == 0) if (Popt == 0)
{ {
char buffer[80];
n = read(f, buf, BSIZE); n = read(f, buf, BSIZE);
if (n == -1)
{
snprintf(buffer, sizeof(buffer),
"Error reading trace device");
perror(buffer);
exit(1);
}
if (Bopt) if (Bopt)
{ {
if ((fwrite(buf, 1, n, BP)) != n) if ((fwrite(buf, 1, n, BP)) != n)
{ {
char buffer[80];
snprintf(buffer, sizeof(buffer), snprintf(buffer, sizeof(buffer),
"Error writing file [%s]", "Error writing file [%s]",
rBPfilename); rBPfilename);