Date: Fri, 10 Apr 1998 22:18:22 +0000 (GMT) From: Terry Lambert <tlambert@primenet.com> To: scrappy@hub.org (The Hermit Hacker) Cc: freebsd-hackers@FreeBSD.ORG Subject: Re: filename from open file descriptor... Message-ID: <199804102218.PAA01789@usr07.primenet.com> In-Reply-To: <Pine.BSF.3.96.980410164633.290G-100000@thelab.hub.org> from "The Hermit Hacker" at Apr 10, 98 04:47:48 pm
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> I'm trying to debug some code, and have an open file descriptor
> that I want to find the file name that its associated with...
>
> is this possible? my first thought was fstat(), but that appears
> to return everything but the name :(
You remember the name when you open the file.
Untested:
----------------------------------------------------------------------------
/*
* This code is relased under BSD licensce in the name of Terrence
* Lambert. Please place appropriate license text into any released
* version of this software.
*/
static char **saved_open_names;
/*
* Overrides weak "open" symbol from libc
*/
int
open( const char *path, int flags, mode_t mode)
{
int rv;
if( saved_open_names == NULL) {
int count;
count = getdtablesize();
saved_open_names = (char **)calloc( count, sizeof(char *));
}
if( saved_open_names == NULL) {
rv = -1;
errno = ENOMEM;
} else {
char *p;
if( ( p = strdup( path)) == NULL) {
rv = -1;
errno = ENOMEM;
} else {
if( ( rv = syscall( SYS_open, path, flags, mode)) == -1) {
free( p);
} else {
if( saved_open_names[ rv] != NULL) {
/* could implement 'close' instead...*/
free( saved_open_names[ rv]);
}
saved_open_names[ rv] = p;
}
}
}
return( rv);
}
/*
* New call...
*/
char *
fdname( int fd)
{
char *rv = NULL;
if( saved_open_names != NULL) {
if( fd >= 0 && fd < getdtablesize()) {
rv = saved_open_names[ fd];
}
}
return( rv);
}
----------------------------------------------------------------------------
Terry Lambert
terry@lambert.org
---
Any opinions in this posting are my own and not those of my present
or previous employers.
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