Reading the symbol table of the currently running executable

[Diomidis Spinellis]

In article <1989Sep14.134546.2497 at newcastle.ac.uk> mccue at 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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