Path: utzoo!attcan!utgpu!watmath!att!dptg!rutgers!cs.utexas.edu!uunet!mcsun!unido!ecrcvax!diomidis
From: diomidis@ecrcvax.UUCP (Diomidis Spinellis)
Newsgroups: comp.unix.wizards
Subject: Re: Reading the symbol table of the currently running executable
Summary: A method int eh 8th research eidtion of unix exists
Message-ID: <777@ecrcvax.UUCP>
Date: 21 Sep 89 10:09:36 GMT
References: <9104@june.cs.washington.edu> <6131@lynx.UUCP> <LIMES.89Sep7153103@ouroborous.wseng.sun.com> <920@aoa.UUCP> <1989Sep14.134546.2497@newcastle.ac.uk>
Reply-To: diomidis@ecrcvax.UUCP (Diomidis Spinellis)
Organization: ECRC, Munich 81, West Germany
Lines: 38

In article <1989Sep14.134546.2497@newcastle.ac.uk> mccue@turing.newcastle.ac.uk (Dan McCue) writes:
[...]
>    Are there other systems that provide a "system service" for finding
>    the (path)name/load map of the running executable(s)?

The 8th Research Unix Edition provides a method of obtaining a file descriptor
to the text file of a running executable.  The idea is to open the image of
the process in the process file system /proc and send the appropriate ioctl.

#include <sys/proc.h>
#include <sys/pioctl.h>

/*
 * Return a read only file descriptor to the text file of an executable
 * given its process id.  Returns -1 on failure.  (Not tested).
 */
int
pid2fd(pid)
	int pid;
{
	static char fname[1024];
	long result;
	int fd;

	sprintf(fname, "/proc/%d", pid);
	if ((fd = open(fname, 0)) == -1)
		return -1;
	if (ioctl(fd, PIOCOPENT, &result) == -1)
		return -1;
	return (int)result;
}

Diomidis
-- 
Diomidis Spinellis          European Computer-Industry Research Centre (ECRC)
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