forked from OSchip/llvm-project
605 lines
18 KiB
C
605 lines
18 KiB
C
/* -*- coding: utf-8 -*-
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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*/
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/**
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* This file implements a shared library. This library can be pre-loaded by
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* the dynamic linker of the Operating System (OS). It implements a few function
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* related to process creation. By pre-load this library the executed process
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* uses these functions instead of those from the standard library.
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*
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* The idea here is to inject a logic before call the real methods. The logic is
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* to dump the call into a file. To call the real method this library is doing
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* the job of the dynamic linker.
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*
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* The only input for the log writing is about the destination directory.
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* This is passed as environment variable.
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*/
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#include "config.h"
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#include <stddef.h>
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#include <stdarg.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <dlfcn.h>
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#include <pthread.h>
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#if defined HAVE_POSIX_SPAWN || defined HAVE_POSIX_SPAWNP
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#include <spawn.h>
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#endif
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#if defined HAVE_NSGETENVIRON
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# include <crt_externs.h>
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#else
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extern char **environ;
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#endif
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#define ENV_OUTPUT "INTERCEPT_BUILD_TARGET_DIR"
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#ifdef APPLE
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# define ENV_FLAT "DYLD_FORCE_FLAT_NAMESPACE"
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# define ENV_PRELOAD "DYLD_INSERT_LIBRARIES"
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# define ENV_SIZE 3
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#else
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# define ENV_PRELOAD "LD_PRELOAD"
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# define ENV_SIZE 2
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#endif
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#define DLSYM(TYPE_, VAR_, SYMBOL_) \
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union { \
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void *from; \
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TYPE_ to; \
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} cast; \
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if (0 == (cast.from = dlsym(RTLD_NEXT, SYMBOL_))) { \
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perror("bear: dlsym"); \
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exit(EXIT_FAILURE); \
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} \
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TYPE_ const VAR_ = cast.to;
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typedef char const * bear_env_t[ENV_SIZE];
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static int bear_capture_env_t(bear_env_t *env);
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static int bear_reset_env_t(bear_env_t *env);
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static void bear_release_env_t(bear_env_t *env);
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static char const **bear_update_environment(char *const envp[], bear_env_t *env);
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static char const **bear_update_environ(char const **in, char const *key, char const *value);
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static char **bear_get_environment();
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static void bear_report_call(char const *fun, char const *const argv[]);
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static char const **bear_strings_build(char const *arg, va_list *ap);
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static char const **bear_strings_copy(char const **const in);
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static char const **bear_strings_append(char const **in, char const *e);
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static size_t bear_strings_length(char const *const *in);
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static void bear_strings_release(char const **);
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static bear_env_t env_names =
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{ ENV_OUTPUT
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, ENV_PRELOAD
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#ifdef ENV_FLAT
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, ENV_FLAT
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#endif
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};
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static bear_env_t initial_env =
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{ 0
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, 0
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#ifdef ENV_FLAT
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, 0
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#endif
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};
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static int initialized = 0;
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static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
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static void on_load(void) __attribute__((constructor));
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static void on_unload(void) __attribute__((destructor));
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#ifdef HAVE_EXECVE
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static int call_execve(const char *path, char *const argv[],
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char *const envp[]);
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#endif
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#ifdef HAVE_EXECVP
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static int call_execvp(const char *file, char *const argv[]);
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#endif
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#ifdef HAVE_EXECVPE
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static int call_execvpe(const char *file, char *const argv[],
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char *const envp[]);
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#endif
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#ifdef HAVE_EXECVP2
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static int call_execvP(const char *file, const char *search_path,
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char *const argv[]);
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#endif
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#ifdef HAVE_EXECT
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static int call_exect(const char *path, char *const argv[],
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char *const envp[]);
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#endif
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#ifdef HAVE_POSIX_SPAWN
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static int call_posix_spawn(pid_t *restrict pid, const char *restrict path,
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const posix_spawn_file_actions_t *file_actions,
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const posix_spawnattr_t *restrict attrp,
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char *const argv[restrict],
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char *const envp[restrict]);
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#endif
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#ifdef HAVE_POSIX_SPAWNP
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static int call_posix_spawnp(pid_t *restrict pid, const char *restrict file,
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const posix_spawn_file_actions_t *file_actions,
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const posix_spawnattr_t *restrict attrp,
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char *const argv[restrict],
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char *const envp[restrict]);
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#endif
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/* Initialization method to Captures the relevant environment variables.
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*/
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static void on_load(void) {
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pthread_mutex_lock(&mutex);
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if (!initialized)
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initialized = bear_capture_env_t(&initial_env);
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pthread_mutex_unlock(&mutex);
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}
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static void on_unload(void) {
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pthread_mutex_lock(&mutex);
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bear_release_env_t(&initial_env);
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initialized = 0;
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pthread_mutex_unlock(&mutex);
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}
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/* These are the methods we are try to hijack.
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*/
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#ifdef HAVE_EXECVE
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int execve(const char *path, char *const argv[], char *const envp[]) {
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bear_report_call(__func__, (char const *const *)argv);
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return call_execve(path, argv, envp);
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}
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#endif
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#ifdef HAVE_EXECV
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#ifndef HAVE_EXECVE
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#error can not implement execv without execve
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#endif
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int execv(const char *path, char *const argv[]) {
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bear_report_call(__func__, (char const *const *)argv);
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char * const * envp = bear_get_environment();
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return call_execve(path, argv, envp);
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}
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#endif
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#ifdef HAVE_EXECVPE
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int execvpe(const char *file, char *const argv[], char *const envp[]) {
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bear_report_call(__func__, (char const *const *)argv);
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return call_execvpe(file, argv, envp);
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}
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#endif
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#ifdef HAVE_EXECVP
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int execvp(const char *file, char *const argv[]) {
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bear_report_call(__func__, (char const *const *)argv);
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return call_execvp(file, argv);
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}
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#endif
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#ifdef HAVE_EXECVP2
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int execvP(const char *file, const char *search_path, char *const argv[]) {
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bear_report_call(__func__, (char const *const *)argv);
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return call_execvP(file, search_path, argv);
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}
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#endif
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#ifdef HAVE_EXECT
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int exect(const char *path, char *const argv[], char *const envp[]) {
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bear_report_call(__func__, (char const *const *)argv);
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return call_exect(path, argv, envp);
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}
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#endif
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#ifdef HAVE_EXECL
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# ifndef HAVE_EXECVE
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# error can not implement execl without execve
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# endif
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int execl(const char *path, const char *arg, ...) {
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va_list args;
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va_start(args, arg);
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char const **argv = bear_strings_build(arg, &args);
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va_end(args);
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bear_report_call(__func__, (char const *const *)argv);
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char * const * envp = bear_get_environment();
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int const result = call_execve(path, (char *const *)argv, envp);
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bear_strings_release(argv);
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return result;
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}
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#endif
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#ifdef HAVE_EXECLP
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# ifndef HAVE_EXECVP
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# error can not implement execlp without execvp
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# endif
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int execlp(const char *file, const char *arg, ...) {
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va_list args;
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va_start(args, arg);
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char const **argv = bear_strings_build(arg, &args);
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va_end(args);
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bear_report_call(__func__, (char const *const *)argv);
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int const result = call_execvp(file, (char *const *)argv);
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bear_strings_release(argv);
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return result;
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}
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#endif
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#ifdef HAVE_EXECLE
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# ifndef HAVE_EXECVE
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# error can not implement execle without execve
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# endif
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// int execle(const char *path, const char *arg, ..., char * const envp[]);
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int execle(const char *path, const char *arg, ...) {
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va_list args;
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va_start(args, arg);
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char const **argv = bear_strings_build(arg, &args);
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char const **envp = va_arg(args, char const **);
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va_end(args);
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bear_report_call(__func__, (char const *const *)argv);
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int const result =
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call_execve(path, (char *const *)argv, (char *const *)envp);
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bear_strings_release(argv);
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return result;
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}
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#endif
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#ifdef HAVE_POSIX_SPAWN
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int posix_spawn(pid_t *restrict pid, const char *restrict path,
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const posix_spawn_file_actions_t *file_actions,
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const posix_spawnattr_t *restrict attrp,
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char *const argv[restrict], char *const envp[restrict]) {
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bear_report_call(__func__, (char const *const *)argv);
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return call_posix_spawn(pid, path, file_actions, attrp, argv, envp);
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}
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#endif
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#ifdef HAVE_POSIX_SPAWNP
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int posix_spawnp(pid_t *restrict pid, const char *restrict file,
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const posix_spawn_file_actions_t *file_actions,
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const posix_spawnattr_t *restrict attrp,
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char *const argv[restrict], char *const envp[restrict]) {
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bear_report_call(__func__, (char const *const *)argv);
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return call_posix_spawnp(pid, file, file_actions, attrp, argv, envp);
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}
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#endif
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/* These are the methods which forward the call to the standard implementation.
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*/
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#ifdef HAVE_EXECVE
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static int call_execve(const char *path, char *const argv[],
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char *const envp[]) {
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typedef int (*func)(const char *, char *const *, char *const *);
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DLSYM(func, fp, "execve");
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char const **const menvp = bear_update_environment(envp, &initial_env);
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int const result = (*fp)(path, argv, (char *const *)menvp);
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bear_strings_release(menvp);
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return result;
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}
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#endif
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#ifdef HAVE_EXECVPE
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static int call_execvpe(const char *file, char *const argv[],
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char *const envp[]) {
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typedef int (*func)(const char *, char *const *, char *const *);
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DLSYM(func, fp, "execvpe");
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char const **const menvp = bear_update_environment(envp, &initial_env);
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int const result = (*fp)(file, argv, (char *const *)menvp);
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bear_strings_release(menvp);
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return result;
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}
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#endif
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#ifdef HAVE_EXECVP
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static int call_execvp(const char *file, char *const argv[]) {
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typedef int (*func)(const char *file, char *const argv[]);
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DLSYM(func, fp, "execvp");
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bear_env_t current_env;
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bear_capture_env_t(¤t_env);
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bear_reset_env_t(&initial_env);
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int const result = (*fp)(file, argv);
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bear_reset_env_t(¤t_env);
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bear_release_env_t(¤t_env);
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return result;
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}
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#endif
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#ifdef HAVE_EXECVP2
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static int call_execvP(const char *file, const char *search_path,
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char *const argv[]) {
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typedef int (*func)(const char *, const char *, char *const *);
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DLSYM(func, fp, "execvP");
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bear_env_t current_env;
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bear_capture_env_t(¤t_env);
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bear_reset_env_t(&initial_env);
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int const result = (*fp)(file, search_path, argv);
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bear_reset_env_t(¤t_env);
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bear_release_env_t(¤t_env);
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return result;
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}
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#endif
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#ifdef HAVE_EXECT
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static int call_exect(const char *path, char *const argv[],
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char *const envp[]) {
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typedef int (*func)(const char *, char *const *, char *const *);
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DLSYM(func, fp, "exect");
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char const **const menvp = bear_update_environment(envp, &initial_env);
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int const result = (*fp)(path, argv, (char *const *)menvp);
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bear_strings_release(menvp);
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return result;
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}
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#endif
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#ifdef HAVE_POSIX_SPAWN
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static int call_posix_spawn(pid_t *restrict pid, const char *restrict path,
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const posix_spawn_file_actions_t *file_actions,
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const posix_spawnattr_t *restrict attrp,
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char *const argv[restrict],
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char *const envp[restrict]) {
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typedef int (*func)(pid_t *restrict, const char *restrict,
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const posix_spawn_file_actions_t *,
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const posix_spawnattr_t *restrict,
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char *const *restrict, char *const *restrict);
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DLSYM(func, fp, "posix_spawn");
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char const **const menvp = bear_update_environment(envp, &initial_env);
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int const result =
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(*fp)(pid, path, file_actions, attrp, argv, (char *const *restrict)menvp);
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bear_strings_release(menvp);
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return result;
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}
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#endif
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#ifdef HAVE_POSIX_SPAWNP
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static int call_posix_spawnp(pid_t *restrict pid, const char *restrict file,
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const posix_spawn_file_actions_t *file_actions,
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const posix_spawnattr_t *restrict attrp,
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char *const argv[restrict],
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char *const envp[restrict]) {
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typedef int (*func)(pid_t *restrict, const char *restrict,
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const posix_spawn_file_actions_t *,
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const posix_spawnattr_t *restrict,
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char *const *restrict, char *const *restrict);
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DLSYM(func, fp, "posix_spawnp");
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char const **const menvp = bear_update_environment(envp, &initial_env);
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int const result =
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(*fp)(pid, file, file_actions, attrp, argv, (char *const *restrict)menvp);
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bear_strings_release(menvp);
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return result;
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}
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#endif
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/* this method is to write log about the process creation. */
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static void bear_report_call(char const *fun, char const *const argv[]) {
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static int const GS = 0x1d;
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static int const RS = 0x1e;
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static int const US = 0x1f;
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if (!initialized)
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return;
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pthread_mutex_lock(&mutex);
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const char *cwd = getcwd(NULL, 0);
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if (0 == cwd) {
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perror("bear: getcwd");
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exit(EXIT_FAILURE);
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}
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char const * const out_dir = initial_env[0];
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size_t const path_max_length = strlen(out_dir) + 32;
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char filename[path_max_length];
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if (-1 == snprintf(filename, path_max_length, "%s/%d.cmd", out_dir, getpid())) {
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perror("bear: snprintf");
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exit(EXIT_FAILURE);
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}
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FILE * fd = fopen(filename, "a+");
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if (0 == fd) {
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perror("bear: fopen");
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exit(EXIT_FAILURE);
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}
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fprintf(fd, "%d%c", getpid(), RS);
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fprintf(fd, "%d%c", getppid(), RS);
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fprintf(fd, "%s%c", fun, RS);
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fprintf(fd, "%s%c", cwd, RS);
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size_t const argc = bear_strings_length(argv);
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for (size_t it = 0; it < argc; ++it) {
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fprintf(fd, "%s%c", argv[it], US);
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}
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fprintf(fd, "%c", GS);
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if (fclose(fd)) {
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perror("bear: fclose");
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exit(EXIT_FAILURE);
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}
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free((void *)cwd);
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pthread_mutex_unlock(&mutex);
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}
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/* update environment assure that chilren processes will copy the desired
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* behaviour */
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static int bear_capture_env_t(bear_env_t *env) {
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int status = 1;
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for (size_t it = 0; it < ENV_SIZE; ++it) {
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char const * const env_value = getenv(env_names[it]);
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char const * const env_copy = (env_value) ? strdup(env_value) : env_value;
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(*env)[it] = env_copy;
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status &= (env_copy) ? 1 : 0;
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}
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return status;
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}
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static int bear_reset_env_t(bear_env_t *env) {
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int status = 1;
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for (size_t it = 0; it < ENV_SIZE; ++it) {
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if ((*env)[it]) {
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setenv(env_names[it], (*env)[it], 1);
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} else {
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unsetenv(env_names[it]);
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}
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}
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return status;
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}
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static void bear_release_env_t(bear_env_t *env) {
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for (size_t it = 0; it < ENV_SIZE; ++it) {
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free((void *)(*env)[it]);
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(*env)[it] = 0;
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}
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}
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static char const **bear_update_environment(char *const envp[], bear_env_t *env) {
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char const **result = bear_strings_copy((char const **)envp);
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for (size_t it = 0; it < ENV_SIZE && (*env)[it]; ++it)
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result = bear_update_environ(result, env_names[it], (*env)[it]);
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return result;
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}
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static char const **bear_update_environ(char const *envs[], char const *key, char const * const value) {
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// find the key if it's there
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size_t const key_length = strlen(key);
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char const **it = envs;
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for (; (it) && (*it); ++it) {
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if ((0 == strncmp(*it, key, key_length)) &&
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(strlen(*it) > key_length) && ('=' == (*it)[key_length]))
|
|
break;
|
|
}
|
|
// allocate a environment entry
|
|
size_t const value_length = strlen(value);
|
|
size_t const env_length = key_length + value_length + 2;
|
|
char *env = malloc(env_length);
|
|
if (0 == env) {
|
|
perror("bear: malloc [in env_update]");
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
if (-1 == snprintf(env, env_length, "%s=%s", key, value)) {
|
|
perror("bear: snprintf");
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
// replace or append the environment entry
|
|
if (it && *it) {
|
|
free((void *)*it);
|
|
*it = env;
|
|
return envs;
|
|
}
|
|
return bear_strings_append(envs, env);
|
|
}
|
|
|
|
static char **bear_get_environment() {
|
|
#if defined HAVE_NSGETENVIRON
|
|
return *_NSGetEnviron();
|
|
#else
|
|
return environ;
|
|
#endif
|
|
}
|
|
|
|
/* util methods to deal with string arrays. environment and process arguments
|
|
* are both represented as string arrays. */
|
|
|
|
static char const **bear_strings_build(char const *const arg, va_list *args) {
|
|
char const **result = 0;
|
|
size_t size = 0;
|
|
for (char const *it = arg; it; it = va_arg(*args, char const *)) {
|
|
result = realloc(result, (size + 1) * sizeof(char const *));
|
|
if (0 == result) {
|
|
perror("bear: realloc");
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
char const *copy = strdup(it);
|
|
if (0 == copy) {
|
|
perror("bear: strdup");
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
result[size++] = copy;
|
|
}
|
|
result = realloc(result, (size + 1) * sizeof(char const *));
|
|
if (0 == result) {
|
|
perror("bear: realloc");
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
result[size++] = 0;
|
|
|
|
return result;
|
|
}
|
|
|
|
static char const **bear_strings_copy(char const **const in) {
|
|
size_t const size = bear_strings_length(in);
|
|
|
|
char const **const result = malloc((size + 1) * sizeof(char const *));
|
|
if (0 == result) {
|
|
perror("bear: malloc");
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
char const **out_it = result;
|
|
for (char const *const *in_it = in; (in_it) && (*in_it);
|
|
++in_it, ++out_it) {
|
|
*out_it = strdup(*in_it);
|
|
if (0 == *out_it) {
|
|
perror("bear: strdup");
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
}
|
|
*out_it = 0;
|
|
return result;
|
|
}
|
|
|
|
static char const **bear_strings_append(char const **const in,
|
|
char const *const e) {
|
|
size_t size = bear_strings_length(in);
|
|
char const **result = realloc(in, (size + 2) * sizeof(char const *));
|
|
if (0 == result) {
|
|
perror("bear: realloc");
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
result[size++] = e;
|
|
result[size++] = 0;
|
|
return result;
|
|
}
|
|
|
|
static size_t bear_strings_length(char const *const *const in) {
|
|
size_t result = 0;
|
|
for (char const *const *it = in; (it) && (*it); ++it)
|
|
++result;
|
|
return result;
|
|
}
|
|
|
|
static void bear_strings_release(char const **in) {
|
|
for (char const *const *it = in; (it) && (*it); ++it) {
|
|
free((void *)*it);
|
|
}
|
|
free((void *)in);
|
|
}
|