| |
| /*--------------------------------------------------------------------*/ |
| /*--- Launching valgrind m_launcher.c ---*/ |
| /*--------------------------------------------------------------------*/ |
| |
| /* |
| This file is part of Valgrind, a dynamic binary instrumentation |
| framework. |
| |
| Copyright (C) 2000-2005 Julian Seward |
| jseward@acm.org |
| |
| This program 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. |
| |
| This program 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 this program; if not, write to the Free Software |
| Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307, USA. |
| |
| The GNU General Public License is contained in the file COPYING. |
| */ |
| |
| /* Note: this is a "normal" program and not part of Valgrind proper, |
| and so it doesn't have to conform to Valgrind's arcane rules on |
| no-glibc-usage etc. */ |
| |
| #include <errno.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <unistd.h> |
| #include <assert.h> |
| |
| #include "pub_core_debuglog.h" |
| #include "pub_core_libcproc.h" // For VALGRIND_LIB, VALGRIND_LAUNCHER |
| |
| |
| |
| #define PATH_MAX 4096 /* POSIX refers to this a lot but I dunno |
| where it is defined */ |
| |
| static void barf ( char* str ) |
| { |
| fprintf(stderr, "valgrind: Cannot continue: %s\n", str ); |
| exit(1); |
| } |
| |
| /* Where we expect to find all our aux files */ |
| static const char *valgrind_lib = VG_LIBDIR; |
| |
| int main(int argc, char** argv, char** envp) |
| { |
| int i, j, loglevel, r; |
| const char *toolname = NULL; |
| const char *cp; |
| char *toolfile; |
| char launcher_name[PATH_MAX+1]; |
| char* new_line; |
| char** new_env; |
| |
| /* Start the debugging-log system ASAP. First find out how many |
| "-d"s were specified. This is a pre-scan of the command line. |
| At the same time, look for the tool name. */ |
| loglevel = 0; |
| for (i = 1; i < argc; i++) { |
| if (argv[i][0] != '-') |
| break; |
| if (0 == strcmp(argv[i], "--")) |
| break; |
| if (0 == strcmp(argv[i], "-d")) |
| loglevel++; |
| if (0 == strncmp(argv[i], "--tool=", 7)) |
| toolname = argv[i] + 7; |
| } |
| |
| /* ... and start the debug logger. Now we can safely emit logging |
| messages all through startup. */ |
| VG_(debugLog_startup)(loglevel, "Stage 1"); |
| |
| /* Make sure we know which tool we're using */ |
| if (toolname) { |
| VG_(debugLog)(1, "launcher", "tool '%s' requested\n", toolname); |
| } else { |
| VG_(debugLog)(1, "launcher", |
| "no tool requested, defaulting to 'memcheck'\n"); |
| toolname = "memcheck"; |
| } |
| |
| /* Figure out the name of this executable (viz, the launcher), so |
| we can tell stage2. stage2 will use the name for recursive |
| invokations of valgrind on child processes. */ |
| memset(launcher_name, 0, PATH_MAX+1); |
| r = readlink("/proc/self/exe", launcher_name, PATH_MAX); |
| if (r == -1) { |
| /* If /proc/self/exe can't be followed, don't give up. Instead |
| continue with an empty string for VALGRIND_LAUNCHER. In the |
| sys_execve wrapper, this is tested, and if found to be empty, |
| fail the execve. */ |
| fprintf(stderr, "valgrind: warning (non-fatal): " |
| "readlink(\"/proc/self/exe\") failed.\n"); |
| fprintf(stderr, "valgrind: continuing, however --trace-children=yes " |
| "will not work.\n"); |
| } |
| |
| /* tediously augment the env: VALGRIND_LAUNCHER=launcher_name */ |
| new_line = malloc(strlen(VALGRIND_LAUNCHER) + 1 |
| + strlen(launcher_name) + 1); |
| if (new_line == NULL) |
| barf("malloc of new_line failed."); |
| strcpy(new_line, VALGRIND_LAUNCHER); |
| strcat(new_line, "="); |
| strcat(new_line, launcher_name); |
| |
| for (j = 0; envp[j]; j++) |
| ; |
| new_env = malloc((j+2) * sizeof(char*)); |
| if (new_env == NULL) |
| barf("malloc of new_env failed."); |
| for (i = 0; i < j; i++) |
| new_env[i] = envp[i]; |
| new_env[i++] = new_line; |
| new_env[i++] = NULL; |
| assert(i == j+2); |
| |
| /* Establish the correct VALGRIND_LIB. */ |
| cp = getenv(VALGRIND_LIB); |
| |
| if (cp != NULL) |
| valgrind_lib = cp; |
| |
| /* Build the stage2 invokation, and execve it. Bye! */ |
| toolfile = malloc(strlen(valgrind_lib) + strlen(toolname) + 2); |
| if (toolfile == NULL) |
| barf("malloc of toolfile failed."); |
| sprintf(toolfile, "%s/%s", valgrind_lib, toolname); |
| |
| VG_(debugLog)(1, "launcher", "launching %s\n", toolfile); |
| |
| execve(toolfile, argv, new_env); |
| |
| fprintf(stderr, "valgrind: failed to start tool '%s': %s\n", |
| toolname, strerror(errno)); |
| |
| exit(1); |
| } |