/* Copyright (c) 2002 Andrew Isaacson <adi@hexapodia.org>
* All rights reserved.
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* pmap.c: implementation of something like Solaris' /usr/proc/bin/pmap
* for linux
*
* Author: Andy Isaacson <adi@acm.org>
* Fri Jun 18 1999
*
* Updated Mon Oct 25 1999
* - calculate total size of shared mappings
* - change output format to read "writable/private" rather than "writable"
*
* Updated Sun Jul 8 2001
* - enlarge fixed-size buffers to handle long filenames
* - update spacing constants
* Thanks to Thomas Dorner <dorner@claranet.de> for the bug report
*
* Updated Mon Jul 29 2002
* - fclose() after processing is complete, to avoid problems when
* operating on many processes.
* Thanks to Diego Calleja <diegocg@teleline.es> for the bug report
*
* Updated Sun Sep 29 2002
* - add a BSD-style license and disclaimer of warranty
*
* Justification: the formatting available in /proc/<pid>/maps is less
* than optimal. It's hard to figure out the size of a mapping from
* that information (unless you can do 8-digit hex arithmetic in your
* head) and it's just generally not friendly. Hence this utility.
*
* Compile with something along the lines of
* gcc -O pmap.c -o pmap
*/
#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>
#include <limits.h>
#include <unistd.h>
#include <sys/types.h>
#include <errno.h>
void
die(char *fmt, ...)
{
va_list a;
va_start(a, fmt);
vfprintf(stderr, fmt, a);
va_end(a);
exit(1);
}
void print_name_pid(pid_t pid)
{
char name[PATH_MAX];
int c, i = 0;
FILE *f;
sprintf(name, "/proc/%ld/cmdline", (long) pid);
f = fopen(name, "r");
if(!f) die("%s: %s\n", name, strerror(errno));
while((c = getc(f)) != EOF && c != 0)
name[i++] = c;
name[i] = '\0';
printf("%s(%ld)\n", name, (long)pid);
fclose(f);
}
void print_maps(pid_t pid)
{
char fname[PATH_MAX];
unsigned long writable = 0, total = 0, shared = 0;
FILE *f;
sprintf(fname, "/proc/%ld/maps", (long)pid);
f = fopen(fname, "r");
if(!f)
die("%s: %s\n", fname, strerror(errno));
while(!feof(f)) {
char buf[PATH_MAX+100], perm[5], dev[6], mapname[PATH_MAX];
unsigned long begin, end, size, inode, foo;
int n;
if(fgets(buf, sizeof(buf), f) == 0)
break;
mapname[0] = '\0';
sscanf(buf, "%lx-%lx %4s %lx %5s %ld %s", &begin, &end, perm,
&foo, dev, &inode, mapname);
size = end - begin;
total += size;
/* the permission string looks like "rwxp", where each character can
* be either the letter, or a hyphen. The final character is either
* p for private or s for shared. We want to add up private writable
* mappings, to get a feel for how much private memory this process
* is taking.
*
* Also, we add up the shared mappings, to see how much this process
* is sharing with others.
*/
if(perm[3] == 'p') {
if(perm[1] == 'w')
writable += size;
} else if(perm[3] == 's')
shared += size;
else
die("unable to parse permission string: '%s'\n", perm);
n = printf("%08lx (%ld KB)", begin, (end - begin)/1024);
n += printf("%*s %s (%s %ld) ", 22-n, "", perm, dev, inode);
printf("%*s %s\n", 44-n, "", mapname);
}
printf("mapped: %ld KB writable/private: %ld KB shared: %ld KB\n",
total/1024, writable/1024, shared/1024);
fclose(f);
}
pid_t parse_pid(char *p)
{
while(!isdigit(*p) && *p)
p++;
return strtol(p, 0, 0);
}
int main(int argc, char **argv)
{
int i;
if(argc < 2)
die("usage: %s [pid|/proc/pid] ...\n", argv[0]);
for(i=1; argv[i]; i++) {
char *ppid;
pid_t pid;
ppid = argv[i];
pid = parse_pid(ppid);
print_name_pid(pid);
print_maps(pid);
}
return 0;
}
