procmap.c

来自「linux 操作系统下对系统资源监控程序的编写」· C语言 代码 · 共 138 行

/* $Id: procmap.c,v 1.14 2003/10/20 20:12:27 hadess Exp $ */

/* Copyright (C) 1998-99 Martin Baulig
   This file is part of LibGTop 1.0.

   Contributed by Martin Baulig <[e-mail]>, April 1998.

   LibGTop is free software; you can redistribute it and/or modify it
   under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License,
   or (at your option) any later version.

   LibGTop is distributed in the hope that it will be useful, but WITHOUT
   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
   for more details.

   You should have received a copy of the GNU General Public License
   along with LibGTop; see the file COPYING. If not, write to the
   Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.
*/

#include <glibtop.h>
#include <glibtop/error.h>
#include <glibtop/procmap.h>

static const unsigned long _glibtop_sysdeps_proc_map =
(1L << GLIBTOP_PROC_MAP_NUMBER) + (1L << GLIBTOP_PROC_MAP_TOTAL) +
(1L << GLIBTOP_PROC_MAP_SIZE);

static const unsigned long _glibtop_sysdeps_map_entry =
(1L << GLIBTOP_MAP_ENTRY_START) + (1L << GLIBTOP_MAP_ENTRY_END) +
(1L << GLIBTOP_MAP_ENTRY_OFFSET) + (1L << GLIBTOP_MAP_ENTRY_PERM) +
(1L << GLIBTOP_MAP_ENTRY_INODE) + (1L << GLIBTOP_MAP_ENTRY_DEVICE) +
(1L << GLIBTOP_MAP_ENTRY_FILENAME);

/* Init function. */

void
glibtop_init_proc_map_s (glibtop *server)
{
	server->sysdeps.proc_map = _glibtop_sysdeps_proc_map;
}

/* Provides detailed information about a process. */

glibtop_map_entry *
glibtop_get_proc_map_s (glibtop *server, glibtop_proc_map *buf,	pid_t pid)
{
	char fn [BUFSIZ];
	glibtop_map_entry *entry_list = NULL;
	int rv, n = 0;
	FILE *maps;

	glibtop_init_s (&server, GLIBTOP_SYSDEPS_PROC_MAP, 0);
	
	memset (buf, 0, sizeof (glibtop_proc_map));

	sprintf (fn, "/proc/%d/maps", pid);

	maps = fopen (fn, "r");
	if (!maps) return NULL;

	do {
		short dev_major, dev_minor;
		unsigned long start, end, offset, inode, perm;
		char flags [5], *format;
		size_t size;

		if (sizeof (void*) == 8)
			format = "%16lx-%16lx %4c\n %16lx %02hx:%02hx %ld";
		else
			format = "%08lx-%08lx %4c\n %08lx %02hx:%02hx %ld";

		rv = fscanf (maps, format,
			     &start, &end, flags, &offset,
			     &dev_major, &dev_minor, &inode);

		flags [4] = 0;

		/* Compute access permissions. */

		perm = 0;

		if (flags [0] == 'r')
			perm |= GLIBTOP_MAP_PERM_READ;
		if (flags [1] == 'w')
			perm |= GLIBTOP_MAP_PERM_WRITE;
		if (flags [2] == 'x')
			perm |= GLIBTOP_MAP_PERM_EXECUTE;
		if (flags [3] == 's')
			perm |= GLIBTOP_MAP_PERM_SHARED;
		if (flags [3] == 'p')
			perm |= GLIBTOP_MAP_PERM_PRIVATE;

		/* Read filename. */

		fn [0] = fgetc (maps);

		if (fn [0] != '\n' && fn [0] != EOF) {
			
			fscanf (maps, "%*[ ]%[^\n]\n", fn);
			
		} else fn [0] = 0;

		size = (n+1) * sizeof (glibtop_map_entry);

		entry_list = g_realloc (entry_list, size);

		memset (&(entry_list [n]), 0, sizeof (glibtop_map_entry));

		entry_list [n].flags = _glibtop_sysdeps_map_entry;

		entry_list [n].start = (guint64) start;
		entry_list [n].end = (guint64) end;
		entry_list [n].offset = (guint64) offset;
		entry_list [n].perm = (guint64) perm;
		entry_list [n].device = (guint64) (dev_major << 8) +
			(guint64) dev_minor;
		entry_list [n].inode = (guint64) inode;

		strncpy (entry_list [n].filename, fn, GLIBTOP_MAP_FILENAME_LEN);
		entry_list [n].filename [GLIBTOP_MAP_FILENAME_LEN] = 0;
		
		n++;

	} while (rv != EOF && rv && fn [0] != EOF);
	
	fclose (maps);

	buf->number = n;
	buf->size = sizeof (glibtop_map_entry);
	buf->total = n * sizeof (glibtop_map_entry);

	return entry_list;
}