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platform_posix.cc
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platform_posix.cc
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#if defined(__unix__) || defined(__APPLE__)
#include "platform.h"
#include "utils.h"
#include "loguru.hpp"
#include <pthread.h>
#if defined(__FreeBSD__)
#include <pthread_np.h>
#include <sys/thr.h>
#elif defined(__OpenBSD__)
#include <pthread_np.h>
#endif
#include <assert.h>
#include <errno.h>
#include <limits.h>
#include <semaphore.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <dirent.h>
#include <sys/stat.h>
#include <sys/types.h> // required for stat.h
#include <errno.h>
#include <fcntl.h>
#include <semaphore.h>
#include <sys/mman.h>
#if defined(__FreeBSD__)
#include <sys/param.h> // MAXPATHLEN
#include <sys/sysctl.h> // sysctl
#elif defined(__linux__)
#include <malloc.h>
#endif
#include <iostream>
#include <string>
namespace {
// Returns the canonicalized absolute pathname, without expanding symbolic
// links. This is a variant of realpath(2), C++ rewrite of
// https://github.com/freebsd/freebsd/blob/master/lib/libc/stdlib/realpath.c
optional<std::string> RealPathNotExpandSymlink(std::string path) {
if (path.empty()) {
errno = EINVAL;
return nullopt;
}
if (path[0] == '\0') {
errno = ENOENT;
return nullopt;
}
// Do not use PATH_MAX because it is tricky on Linux.
// See https://eklitzke.org/path-max-is-tricky
char tmp[1024];
std::string resolved;
size_t i = 0;
struct stat sb;
if (path[0] == '/') {
resolved = "/";
i = 1;
} else {
if (!getcwd(tmp, sizeof tmp))
return nullopt;
resolved = tmp;
}
while (i < path.size()) {
auto j = path.find('/', i);
if (j == std::string::npos)
j = path.size();
auto next_token = path.substr(i, j - i);
i = j + 1;
if (resolved.back() != '/')
resolved += '/';
if (next_token.empty() || next_token == ".") {
// Handle consequential slashes and "."
continue;
} else if (next_token == "..") {
// Strip the last path component except when it is single "/"
if (resolved.size() > 1)
resolved.resize(resolved.rfind('/', resolved.size() - 2) + 1);
continue;
}
// Append the next path component.
// Here we differ from realpath(3), we use stat(2) instead of
// lstat(2) because we do not want to resolve symlinks.
resolved += next_token;
if (stat(resolved.c_str(), &sb) != 0)
return nullopt;
if (!S_ISDIR(sb.st_mode) && j < path.size()) {
errno = ENOTDIR;
return nullopt;
}
}
// Remove trailing slash except when a single "/".
if (resolved.size() > 1 && resolved.back() == '/')
resolved.pop_back();
return resolved;
}
} // namespace
void PlatformInit() {}
#ifdef __APPLE__
extern "C" int _NSGetExecutablePath(char* buf, uint32_t* bufsize);
#endif
// See
// https://stackoverflow.com/questions/143174/how-do-i-get-the-directory-that-a-program-is-running-from
std::string GetExecutablePath() {
#ifdef __APPLE__
uint32_t size = 0;
_NSGetExecutablePath(nullptr, &size);
char* buffer = new char[size];
_NSGetExecutablePath(buffer, &size);
char* resolved = realpath(buffer, nullptr);
std::string result(resolved);
delete[] buffer;
free(resolved);
return result;
#elif defined(__FreeBSD__)
static const int name[] = {
CTL_KERN,
KERN_PROC,
KERN_PROC_PATHNAME,
-1,
};
char path[MAXPATHLEN];
size_t len = sizeof(path);
path[0] = '\0';
(void)sysctl(name, 4, path, &len, NULL, 0);
return std::string(path);
#else
char buffer[PATH_MAX] = {0};
if (-1 == readlink("/proc/self/exe", buffer, PATH_MAX))
return "";
return buffer;
#endif
}
std::string GetWorkingDirectory() {
char result[FILENAME_MAX];
if (!getcwd(result, sizeof(result)))
return "";
std::string working_dir = std::string(result, strlen(result));
EnsureEndsInSlash(working_dir);
return working_dir;
}
std::string NormalizePath(const std::string& path) {
optional<std::string> resolved = RealPathNotExpandSymlink(path);
return resolved ? *resolved : path;
}
bool TryMakeDirectory(const std::string& absolute_path) {
const mode_t kMode = 0777; // UNIX style permissions
if (mkdir(absolute_path.c_str(), kMode) == -1) {
// Success if the directory exists.
return errno == EEXIST;
}
return true;
}
void SetCurrentThreadName(const std::string& thread_name) {
loguru::set_thread_name(thread_name.c_str());
#if defined(__APPLE__)
pthread_setname_np(thread_name.c_str());
#elif defined(__FreeBSD__) || defined(__OpenBSD__)
pthread_set_name_np(pthread_self(), thread_name.c_str());
#elif defined(__linux__)
pthread_setname_np(pthread_self(), thread_name.c_str());
#endif
}
optional<int64_t> GetLastModificationTime(const std::string& absolute_path) {
struct stat buf;
if (stat(absolute_path.c_str(), &buf) != 0) {
switch (errno) {
case ENOENT:
// std::cerr << "GetLastModificationTime: unable to find file " <<
// absolute_path << std::endl;
return nullopt;
case EINVAL:
// std::cerr << "GetLastModificationTime: invalid param to _stat for
// file file " << absolute_path << std::endl;
return nullopt;
default:
// std::cerr << "GetLastModificationTime: unhandled for " <<
// absolute_path << std::endl; exit(1);
return nullopt;
}
}
return buf.st_mtime;
}
void MoveFileTo(const std::string& dest, const std::string& source) {
// TODO/FIXME - do a real move.
CopyFileTo(dest, source);
}
// See http://stackoverflow.com/q/13198627
void CopyFileTo(const std::string& dest, const std::string& source) {
int fd_from = open(source.c_str(), O_RDONLY);
if (fd_from < 0)
return;
int fd_to = open(dest.c_str(), O_WRONLY | O_CREAT, 0666);
if (fd_to < 0)
goto out_error;
char buf[4096];
ssize_t nread;
while (nread = read(fd_from, buf, sizeof buf), nread > 0) {
char* out_ptr = buf;
ssize_t nwritten;
do {
nwritten = write(fd_to, out_ptr, nread);
if (nwritten >= 0) {
nread -= nwritten;
out_ptr += nwritten;
} else if (errno != EINTR)
goto out_error;
} while (nread > 0);
}
if (nread == 0) {
if (close(fd_to) < 0) {
fd_to = -1;
goto out_error;
}
close(fd_from);
return;
}
out_error:
close(fd_from);
if (fd_to >= 0)
close(fd_to);
}
bool IsSymLink(const std::string& path) {
struct stat buf;
return lstat(path.c_str(), &buf) == 0 && S_ISLNK(buf.st_mode);
}
std::vector<std::string> GetPlatformClangArguments() {
return {};
}
void FreeUnusedMemory() {
#if defined(__GLIBC__)
malloc_trim(0);
#endif
}
bool RunObjectiveCIndexTests() {
#if defined(__APPLE__)
return true;
#else
return false;
#endif
}
void TraceMe() {
// If the environment variable is defined, wait for a debugger.
// In gdb, you need to invoke `signal SIGCONT` if you want cquery to continue
// after detaching.
if (getenv("CQUERY_TRACEME"))
raise(SIGTSTP);
}
#endif