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/* List dynamic shared objects linked into given process.
Copyright (C) 2011 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@gmail.com>, 2011.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <alloca.h>
#include <argp.h>
#include <elf.h>
#include <errno.h>
#include <error.h>
#include <fcntl.h>
#include <libintl.h>
#include <link.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/ptrace.h>
#include <sys/stat.h>
#include <ldsodefs.h>
#include <version.h>
/* Global variables. */
extern char *program_invocation_short_name;
#define PACKAGE _libc_intl_domainname
/* External functions. */
extern void *xmalloc (size_t n);
extern void *xrealloc (void *p, size_t n);
/* Name and version of program. */
static void print_version (FILE *stream, struct argp_state *state);
void (*argp_program_version_hook) (FILE *, struct argp_state *) = print_version;
/* Bug report address. */
const char *argp_program_bug_address = N_("\
For bug reporting instructions, please see:\n\
<http://www.gnu.org/software/libc/bugs.html>.\n");
/* Definitions of arguments for argp functions. */
static const struct argp_option options[] =
{
{ NULL, 0, NULL, 0, NULL }
};
/* Short description of program. */
static const char doc[] = N_("\
List dynamic shared objects loaded into process.");
/* Strings for arguments in help texts. */
static const char args_doc[] = N_("PID");
/* Prototype for option handler. */
static error_t parse_opt (int key, char *arg, struct argp_state *state);
/* Data structure to communicate with argp functions. */
static struct argp argp =
{
options, parse_opt, args_doc, doc, NULL, NULL, NULL
};
// File descriptor of /proc/*/mem file.
static int memfd;
/* Name of the executable */
static char *exe;
/* Local functions. */
static int get_process_info (pid_t pid);
int
main (int argc, char *argv[])
{
/* Parse and process arguments. */
int remaining;
argp_parse (&argp, argc, argv, 0, &remaining, NULL);
if (remaining != argc - 1)
{
fprintf (stderr,
gettext ("Exactly one parameter with process ID required.\n"));
argp_help (&argp, stderr, ARGP_HELP_SEE, program_invocation_short_name);
return 1;
}
char *endp;
errno = 0;
pid_t pid = strtoul (argv[remaining], &endp, 10);
if ((pid == ULONG_MAX && errno == ERANGE) || *endp != '\0')
error (EXIT_FAILURE, 0, gettext ("invalid process ID '%s'"),
argv[remaining]);
/* Determine the program name. */
char buf[11 + 3 * sizeof (pid)];
snprintf (buf, sizeof (buf), "/proc/%lu/exe", (unsigned long int) pid);
size_t exesize = 1024;
exe = alloca (exesize);
ssize_t nexe;
while ((nexe = readlink (buf, exe, exesize)) == exesize)
extend_alloca (exe, exesize, 2 * exesize);
if (nexe == -1)
exe = (char *) "<program name undetermined>";
else
exe[nexe] = '\0';
if (ptrace (PTRACE_ATTACH, pid, NULL, NULL) != 0)
error (EXIT_FAILURE, errno, gettext ("cannot attach to process %lu"),
(unsigned long int) pid);
int status = get_process_info (pid);
ptrace (PTRACE_DETACH, pid, NULL, NULL);
return status;
}
/* Handle program arguments. */
static error_t
parse_opt (int key, char *arg, struct argp_state *state)
{
switch (key)
{
default:
return ARGP_ERR_UNKNOWN;
}
return 0;
}
/* Print the version information. */
static void
print_version (FILE *stream, struct argp_state *state)
{
fprintf (stream, "pldd (GNU %s) %s\n", PACKAGE, VERSION);
fprintf (stream, gettext ("\
Copyright (C) %s Free Software Foundation, Inc.\n\
This is free software; see the source for copying conditions. There is NO\n\
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n\
"), "2011");
fprintf (stream, gettext ("Written by %s.\n"), "Ulrich Drepper");
}
#define CLASS 32
#include "pldd-xx.c"
#define CLASS 64
#include "pldd-xx.c"
static int
get_process_info (pid_t pid)
{
char buf[12 + 3 * sizeof (pid)];
snprintf (buf, sizeof (buf), "/proc/%lu/mem", (unsigned long int) pid);
memfd = open (buf, O_RDONLY);
if (memfd == -1)
goto no_info;
snprintf (buf, sizeof (buf), "/proc/%lu/exe", (unsigned long int) pid);
int fd = open (buf, O_RDONLY);
if (fd == -1)
{
no_info:
error (0, errno, gettext ("cannot get information about process %lu"),
(unsigned long int) pid);
return EXIT_FAILURE;
}
union
{
Elf32_Ehdr ehdr32;
Elf64_Ehdr ehdr64;
} uehdr;
if (read (fd, &uehdr, sizeof (uehdr)) != sizeof (uehdr))
goto no_info;
close (fd);
if (memcmp (uehdr.ehdr32.e_ident, ELFMAG, SELFMAG) != 0)
{
error (0, 0, gettext ("process %lu is no ELF program"),
(unsigned long int) pid);
return EXIT_FAILURE;
}
snprintf (buf, sizeof (buf), "/proc/%lu/auxv", (unsigned long int) pid);
fd = open (buf, O_RDONLY);
if (fd == -1)
goto no_info;
size_t auxv_size = 0;
void *auxv = NULL;
while (1)
{
auxv_size += 512;
auxv = xrealloc (auxv, auxv_size);
ssize_t n = read (fd, auxv, auxv_size);
if (n < 0)
goto no_info;
if (n < auxv_size)
{
auxv_size = n;
break;
}
}
close (fd);
if (uehdr.ehdr32.e_ident[EI_CLASS] == ELFCLASS32)
return find_maps32 (pid, &uehdr.ehdr32, auxv, auxv_size);
else
return find_maps64 (pid, &uehdr.ehdr64, auxv, auxv_size);
}
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