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authorUlrich Drepper <drepper@gmail.com>2011-06-09 07:06:21 -0400
committerUlrich Drepper <drepper@gmail.com>2011-06-09 07:06:21 -0400
commit11988f8f9656042c3dfd9002ac85dff33173b9bd (patch)
tree2ff270ab6198e49a658120831832f08e4c2e34bf /elf/pldd.c
parent8621fc3b996a7bf5d60a0fb86cb15a078dcbf542 (diff)
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Add pldd program
Diffstat (limited to 'elf/pldd.c')
-rw-r--r--elf/pldd.c234
1 files changed, 234 insertions, 0 deletions
diff --git a/elf/pldd.c b/elf/pldd.c
new file mode 100644
index 0000000000..9fac19ebe4
--- /dev/null
+++ b/elf/pldd.c
@@ -0,0 +1,234 @@
+/* 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);
+}