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/*--------------------------------------------------------------------*/
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/*--- Launching valgrind m_launcher.c ---*/
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/*--------------------------------------------------------------------*/
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This file is part of Valgrind, a dynamic binary instrumentation
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Copyright (C) 2000-2006 Julian Seward
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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The GNU General Public License is contained in the file COPYING.
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/* Note: this is a "normal" program and not part of Valgrind proper,
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and so it doesn't have to conform to Valgrind's arcane rules on
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no-glibc-usage etc. */
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#include "pub_core_debuglog.h"
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#include "pub_core_libcproc.h" // For VALGRIND_LIB, VALGRIND_LAUNCHER
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#include "pub_core_ume.h"
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#define PATH_MAX 4096 /* POSIX refers to this a lot but I dunno
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where it is defined */
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#define EM_X86_64 62 // elf.h doesn't define this on some older systems
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/* Report fatal errors */
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__attribute__((noreturn))
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static void barf ( const char *format, ... )
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va_start(vargs, format);
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fprintf(stderr, "valgrind: Cannot continue: ");
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vfprintf(stderr, format, vargs);
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fprintf(stderr, "\n");
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/* Search the path for the client program */
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static const char *find_client(const char *clientname)
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static char fullname[PATH_MAX];
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const char *path = getenv("PATH");
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if ((colon = strchr(path, ':')) == NULL)
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strcpy(fullname, path);
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memcpy(fullname, path, colon - path);
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fullname[colon - path] = '\0';
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strcat(fullname, "/");
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strcat(fullname, clientname);
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if (access(fullname, R_OK|X_OK) == 0)
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/* Examine the client and work out which platform it is for */
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static const char *select_platform(const char *clientname)
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unsigned char *header;
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const char *platform = NULL;
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long pagesize = sysconf(_SC_PAGESIZE);
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if (strchr(clientname, '/') == NULL)
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clientname = find_client(clientname);
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if ((fd = open(clientname, O_RDONLY)) < 0)
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// barf("open(%s): %s", clientname, strerror(errno));
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if ((header = mmap(NULL, pagesize, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0)) == MAP_FAILED)
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// barf("mmap(%s): %s", clientname, strerror(errno));
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if (header[0] == '#' && header[1] == '!') {
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char *interp = (char *)header + 2;
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while (*interp == ' ' || *interp == '\t')
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for (interpend = interp; !isspace(*interpend); interpend++)
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platform = select_platform(interp);
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} else if (memcmp(header, ELFMAG, SELFMAG) == 0) {
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if (header[EI_CLASS] == ELFCLASS32) {
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const Elf32_Ehdr *ehdr = (Elf32_Ehdr *)header;
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if (header[EI_DATA] == ELFDATA2LSB) {
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if (ehdr->e_machine == EM_386 &&
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ehdr->e_ident[EI_OSABI] == ELFOSABI_SYSV) {
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platform = "x86-linux";
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else if (header[EI_DATA] == ELFDATA2MSB) {
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if (ehdr->e_machine == EM_PPC &&
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ehdr->e_ident[EI_OSABI] == ELFOSABI_SYSV) {
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platform = "ppc32-linux";
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} else if (header[EI_CLASS] == ELFCLASS64) {
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const Elf64_Ehdr *ehdr = (Elf64_Ehdr *)header;
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if (header[EI_DATA] == ELFDATA2LSB) {
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if (ehdr->e_machine == EM_X86_64 &&
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ehdr->e_ident[EI_OSABI] == ELFOSABI_SYSV) {
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platform = "amd64-linux";
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} else if (header[EI_DATA] == ELFDATA2MSB) {
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if (ehdr->e_machine == EM_PPC64 &&
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ehdr->e_ident[EI_OSABI] == ELFOSABI_SYSV) {
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platform = "ppc64-linux";
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munmap(header, pagesize);
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/* Where we expect to find all our aux files */
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static const char *valgrind_lib = VG_LIBDIR;
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int main(int argc, char** argv, char** envp)
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int i, j, loglevel, r;
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const char *toolname = NULL;
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const char *clientname = NULL;
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const char *platform;
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const char *default_platform;
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char launcher_name[PATH_MAX+1];
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/* Start the debugging-log system ASAP. First find out how many
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"-d"s were specified. This is a pre-scan of the command line.
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At the same time, look for the tool name. */
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for (i = 1; i < argc; i++) {
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if (argv[i][0] != '-') {
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clientname = argv[i];
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if (0 == strcmp(argv[i], "--")) {
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clientname = argv[i+1];
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if (0 == strcmp(argv[i], "-d"))
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if (0 == strncmp(argv[i], "--tool=", 7))
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toolname = argv[i] + 7;
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/* ... and start the debug logger. Now we can safely emit logging
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messages all through startup. */
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VG_(debugLog_startup)(loglevel, "Stage 1");
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/* Make sure we know which tool we're using */
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VG_(debugLog)(1, "launcher", "tool '%s' requested\n", toolname);
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VG_(debugLog)(1, "launcher",
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"no tool requested, defaulting to 'memcheck'\n");
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toolname = "memcheck";
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/* Select a platform to use if we can't decide that by looking at
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the executable (eg because it's a shell script). Note that the
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default_platform is not necessarily either the primary or
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secondary build target. Instead it's chosen to maximise the
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chances that /bin/sh will work on it. Hence for a primary
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target of ppc64-linux we still choose ppc32-linux as the default
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target, because on most ppc64-linux setups, the basic /bin,
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/usr/bin, etc, stuff is built in 32-bit mode, not 64-bit
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if (0==strcmp(VG_PLATFORM,"x86-linux"))
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default_platform = "x86-linux";
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else if (0==strcmp(VG_PLATFORM,"amd64-linux"))
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default_platform = "amd64-linux";
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else if (0==strcmp(VG_PLATFORM,"ppc32-linux"))
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default_platform = "ppc32-linux";
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else if (0==strcmp(VG_PLATFORM,"ppc64-linux"))
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default_platform = "ppc32-linux";
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barf("Unknown VG_PLATFORM '%s'", VG_PLATFORM);
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/* Work out what platform to use, or use the default platform if
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if (clientname == NULL) {
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VG_(debugLog)(1, "launcher",
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"no client specified, defaulting platform to '%s'\n",
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platform = default_platform;
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} else if ((platform = select_platform(clientname)) != NULL) {
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VG_(debugLog)(1, "launcher", "selected platform '%s'\n", platform);
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VG_(debugLog)(1, "launcher",
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"no platform detected, defaulting platform to '%s'\n",
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platform = default_platform;
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/* Figure out the name of this executable (viz, the launcher), so
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we can tell stage2. stage2 will use the name for recursive
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invokations of valgrind on child processes. */
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memset(launcher_name, 0, PATH_MAX+1);
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r = readlink("/proc/self/exe", launcher_name, PATH_MAX);
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/* If /proc/self/exe can't be followed, don't give up. Instead
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continue with an empty string for VALGRIND_LAUNCHER. In the
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sys_execve wrapper, this is tested, and if found to be empty,
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fprintf(stderr, "valgrind: warning (non-fatal): "
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"readlink(\"/proc/self/exe\") failed.\n");
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fprintf(stderr, "valgrind: continuing, however --trace-children=yes "
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/* tediously augment the env: VALGRIND_LAUNCHER=launcher_name */
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new_line = malloc(strlen(VALGRIND_LAUNCHER) + 1
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+ strlen(launcher_name) + 1);
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if (new_line == NULL)
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barf("malloc of new_line failed.");
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strcpy(new_line, VALGRIND_LAUNCHER);
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strcat(new_line, "=");
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strcat(new_line, launcher_name);
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for (j = 0; envp[j]; j++)
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new_env = malloc((j+2) * sizeof(char*));
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barf("malloc of new_env failed.");
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for (i = 0; i < j; i++)
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new_env[i] = envp[i];
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new_env[i++] = new_line;
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/* Establish the correct VALGRIND_LIB. */
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cp = getenv(VALGRIND_LIB);
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/* Build the stage2 invokation, and execve it. Bye! */
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toolfile = malloc(strlen(valgrind_lib) + strlen(toolname) + strlen(platform) + 3);
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if (toolfile == NULL)
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barf("malloc of toolfile failed.");
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sprintf(toolfile, "%s/%s/%s", valgrind_lib, platform, toolname);
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VG_(debugLog)(1, "launcher", "launching %s\n", toolfile);
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execve(toolfile, argv, new_env);
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fprintf(stderr, "valgrind: failed to start tool '%s' for platform '%s': %s\n",
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toolname, platform, strerror(errno));
added
removed
coregrind/launcher.c
