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#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#include <algorithm>
#include <functional>
#include "io.h"
#include "utility.h"
#include "actual_function.h"
#include "change_tracker.h"
static std::unique_ptr<io::FileDescriptorGuard> fd_guard;
static std::unique_ptr<utility::Logger> logger;
static std::unique_ptr<utility::ChangeTracker> tracker;
void init() __attribute__ ((constructor));
void init() {
if ( getenv("CHANGE_LOG_TARGET") != NULL ) {
fd_guard = std::make_unique<io::FileDescriptorGuard>(
getenv("CHANGE_LOG_TARGET")
);
logger = std::make_unique<utility::Logger>(*fd_guard);
} else {
logger = std::make_unique<utility::Logger>(STDERR_FILENO);
}
tracker = std::make_unique<utility::ChangeTracker>(logger.get());
}
void exit(int status) {
__attribute__((__noreturn__)) void(*actual_exit)(int) = nullptr;
const void* symbol_address = dlsym(RTLD_NEXT, "exit");
std::memcpy(&actual_exit, &symbol_address, sizeof(symbol_address));
logger->append("exit");
actual_exit(status);
}
ssize_t write(int fd, const void* buffer, size_t count) {
if ( io::is_regular_file(fd) ) {
const std::string file_name{ io::get_file_name(fd) };
if ( !tracker->is_tracked(file_name) ) {
tracker->track(file_name);
}
}
return actual::write(fd, buffer, count);
}
int rename(const char* old_path, const char* new_path) {
if ( !tracker->is_tracked(old_path) ) {
tracker->track(old_path);
}
logger->append("renamed '" + std::string(old_path) + "' to '" + std::string(new_path) + "'");
return actual::rename(old_path, new_path);
}
int rmdir(const char* path) {
logger->append("removed directory '" + std::string(path) + "'");
return actual::rmdir(path);
}
int unlink(const char* path) {
if ( io::is_regular_file(path) ) {
logger->append("rm '" + std::string(path) + "'");
}
return actual::unlink(path);
}
int unlinkat(int dirfd, const char* path, int flags) {
if ( dirfd == AT_FDCWD ) {
logger->append("removed '" + std::string(path) + "'");
} else {
logger->append("removed '" + io::get_file_name(dirfd) + path + "'");
}
return actual::unlinkat(dirfd, path, flags);
}
void* mmap(void* addr, size_t length, int prot, int flags, int fd, off_t offset) {
if ( ( prot & PROT_WRITE ) && io::is_regular_file(fd) ) {
const std::string file_name{ io::get_file_name(fd) };
if ( !tracker->is_tracked(file_name) ) {
tracker->track(file_name);
}
}
return actual::mmap(addr, length, prot, flags, fd, offset);
}
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