1#![allow(unused_imports)] #[cfg(test)]
6mod tests;
7
8use core::slice::memchr;
9
10use libc::{c_char, c_int, c_void};
11
12use crate::error::Error as StdError;
13use crate::ffi::{CStr, CString, OsStr, OsString};
14use crate::os::unix::prelude::*;
15use crate::path::{self, PathBuf};
16use crate::sync::{PoisonError, RwLock};
17use crate::sys::common::small_c_string::{run_path_with_cstr, run_with_cstr};
18#[cfg(all(target_env = "gnu", not(target_os = "vxworks")))]
19use crate::sys::weak::weak;
20use crate::sys::{cvt, fd};
21use crate::{fmt, io, iter, mem, ptr, slice, str, vec};
22
23const TMPBUF_SZ: usize = 128;
24
25cfg_if::cfg_if! {
26 if #[cfg(target_os = "redox")] {
27 const PATH_SEPARATOR: u8 = b';';
28 } else {
29 const PATH_SEPARATOR: u8 = b':';
30 }
31}
32
33unsafe extern "C" {
34 #[cfg(not(any(target_os = "dragonfly", target_os = "vxworks", target_os = "rtems")))]
35 #[cfg_attr(
36 any(
37 target_os = "linux",
38 target_os = "emscripten",
39 target_os = "fuchsia",
40 target_os = "l4re",
41 target_os = "hurd",
42 ),
43 link_name = "__errno_location"
44 )]
45 #[cfg_attr(
46 any(
47 target_os = "netbsd",
48 target_os = "openbsd",
49 target_os = "android",
50 target_os = "redox",
51 target_os = "nuttx",
52 target_env = "newlib"
53 ),
54 link_name = "__errno"
55 )]
56 #[cfg_attr(any(target_os = "solaris", target_os = "illumos"), link_name = "___errno")]
57 #[cfg_attr(target_os = "nto", link_name = "__get_errno_ptr")]
58 #[cfg_attr(any(target_os = "freebsd", target_vendor = "apple"), link_name = "__error")]
59 #[cfg_attr(target_os = "haiku", link_name = "_errnop")]
60 #[cfg_attr(target_os = "aix", link_name = "_Errno")]
61 fn errno_location() -> *mut c_int;
62}
63
64#[cfg(not(any(target_os = "dragonfly", target_os = "vxworks", target_os = "rtems")))]
66pub fn errno() -> i32 {
67 unsafe { (*errno_location()) as i32 }
68}
69
70#[cfg(all(not(target_os = "dragonfly"), not(target_os = "vxworks"), not(target_os = "rtems")))]
73#[allow(dead_code)] pub fn set_errno(e: i32) {
75 unsafe { *errno_location() = e as c_int }
76}
77
78#[cfg(target_os = "vxworks")]
79pub fn errno() -> i32 {
80 unsafe { libc::errnoGet() }
81}
82
83#[cfg(target_os = "rtems")]
84pub fn errno() -> i32 {
85 unsafe extern "C" {
86 #[thread_local]
87 static _tls_errno: c_int;
88 }
89
90 unsafe { _tls_errno as i32 }
91}
92
93#[cfg(target_os = "dragonfly")]
94pub fn errno() -> i32 {
95 unsafe extern "C" {
96 #[thread_local]
97 static errno: c_int;
98 }
99
100 unsafe { errno as i32 }
101}
102
103#[cfg(target_os = "dragonfly")]
104#[allow(dead_code)]
105pub fn set_errno(e: i32) {
106 unsafe extern "C" {
107 #[thread_local]
108 static mut errno: c_int;
109 }
110
111 unsafe {
112 errno = e;
113 }
114}
115
116pub fn error_string(errno: i32) -> String {
118 unsafe extern "C" {
119 #[cfg_attr(
120 all(
121 any(target_os = "linux", target_os = "hurd", target_env = "newlib"),
122 not(target_env = "ohos")
123 ),
124 link_name = "__xpg_strerror_r"
125 )]
126 fn strerror_r(errnum: c_int, buf: *mut c_char, buflen: libc::size_t) -> c_int;
127 }
128
129 let mut buf = [0 as c_char; TMPBUF_SZ];
130
131 let p = buf.as_mut_ptr();
132 unsafe {
133 if strerror_r(errno as c_int, p, buf.len()) < 0 {
134 panic!("strerror_r failure");
135 }
136
137 let p = p as *const _;
138 String::from_utf8_lossy(CStr::from_ptr(p).to_bytes()).into()
141 }
142}
143
144#[cfg(target_os = "espidf")]
145pub fn getcwd() -> io::Result<PathBuf> {
146 Ok(PathBuf::from("/"))
147}
148
149#[cfg(not(target_os = "espidf"))]
150pub fn getcwd() -> io::Result<PathBuf> {
151 let mut buf = Vec::with_capacity(512);
152 loop {
153 unsafe {
154 let ptr = buf.as_mut_ptr() as *mut libc::c_char;
155 if !libc::getcwd(ptr, buf.capacity()).is_null() {
156 let len = CStr::from_ptr(buf.as_ptr() as *const libc::c_char).to_bytes().len();
157 buf.set_len(len);
158 buf.shrink_to_fit();
159 return Ok(PathBuf::from(OsString::from_vec(buf)));
160 } else {
161 let error = io::Error::last_os_error();
162 if error.raw_os_error() != Some(libc::ERANGE) {
163 return Err(error);
164 }
165 }
166
167 let cap = buf.capacity();
170 buf.set_len(cap);
171 buf.reserve(1);
172 }
173 }
174}
175
176#[cfg(target_os = "espidf")]
177pub fn chdir(_p: &path::Path) -> io::Result<()> {
178 super::unsupported::unsupported()
179}
180
181#[cfg(not(target_os = "espidf"))]
182pub fn chdir(p: &path::Path) -> io::Result<()> {
183 let result = run_path_with_cstr(p, &|p| unsafe { Ok(libc::chdir(p.as_ptr())) })?;
184 if result == 0 { Ok(()) } else { Err(io::Error::last_os_error()) }
185}
186
187pub struct SplitPaths<'a> {
188 iter: iter::Map<slice::Split<'a, u8, fn(&u8) -> bool>, fn(&'a [u8]) -> PathBuf>,
189}
190
191pub fn split_paths(unparsed: &OsStr) -> SplitPaths<'_> {
192 fn bytes_to_path(b: &[u8]) -> PathBuf {
193 PathBuf::from(<OsStr as OsStrExt>::from_bytes(b))
194 }
195 fn is_separator(b: &u8) -> bool {
196 *b == PATH_SEPARATOR
197 }
198 let unparsed = unparsed.as_bytes();
199 SplitPaths {
200 iter: unparsed
201 .split(is_separator as fn(&u8) -> bool)
202 .map(bytes_to_path as fn(&[u8]) -> PathBuf),
203 }
204}
205
206impl<'a> Iterator for SplitPaths<'a> {
207 type Item = PathBuf;
208 fn next(&mut self) -> Option<PathBuf> {
209 self.iter.next()
210 }
211 fn size_hint(&self) -> (usize, Option<usize>) {
212 self.iter.size_hint()
213 }
214}
215
216#[derive(Debug)]
217pub struct JoinPathsError;
218
219pub fn join_paths<I, T>(paths: I) -> Result<OsString, JoinPathsError>
220where
221 I: Iterator<Item = T>,
222 T: AsRef<OsStr>,
223{
224 let mut joined = Vec::new();
225
226 for (i, path) in paths.enumerate() {
227 let path = path.as_ref().as_bytes();
228 if i > 0 {
229 joined.push(PATH_SEPARATOR)
230 }
231 if path.contains(&PATH_SEPARATOR) {
232 return Err(JoinPathsError);
233 }
234 joined.extend_from_slice(path);
235 }
236 Ok(OsStringExt::from_vec(joined))
237}
238
239impl fmt::Display for JoinPathsError {
240 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
241 write!(f, "path segment contains separator `{}`", char::from(PATH_SEPARATOR))
242 }
243}
244
245impl StdError for JoinPathsError {
246 #[allow(deprecated)]
247 fn description(&self) -> &str {
248 "failed to join paths"
249 }
250}
251
252#[cfg(target_os = "aix")]
253pub fn current_exe() -> io::Result<PathBuf> {
254 #[cfg(test)]
255 use realstd::env;
256
257 #[cfg(not(test))]
258 use crate::env;
259 use crate::io::ErrorKind;
260
261 let exe_path = env::args().next().ok_or(io::const_error!(
262 ErrorKind::NotFound,
263 "an executable path was not found because no arguments were provided through argv",
264 ))?;
265 let path = PathBuf::from(exe_path);
266 if path.is_absolute() {
267 return path.canonicalize();
268 }
269 if let Some(pstr) = path.to_str()
271 && pstr.contains("/")
272 {
273 return getcwd().map(|cwd| cwd.join(path))?.canonicalize();
274 }
275 if let Some(p) = getenv(OsStr::from_bytes("PATH".as_bytes())) {
277 for search_path in split_paths(&p) {
278 let pb = search_path.join(&path);
279 if pb.is_file()
280 && let Ok(metadata) = crate::fs::metadata(&pb)
281 && metadata.permissions().mode() & 0o111 != 0
282 {
283 return pb.canonicalize();
284 }
285 }
286 }
287 Err(io::const_error!(ErrorKind::NotFound, "an executable path was not found"))
288}
289
290#[cfg(any(target_os = "freebsd", target_os = "dragonfly"))]
291pub fn current_exe() -> io::Result<PathBuf> {
292 unsafe {
293 let mut mib = [
294 libc::CTL_KERN as c_int,
295 libc::KERN_PROC as c_int,
296 libc::KERN_PROC_PATHNAME as c_int,
297 -1 as c_int,
298 ];
299 let mut sz = 0;
300 cvt(libc::sysctl(
301 mib.as_mut_ptr(),
302 mib.len() as libc::c_uint,
303 ptr::null_mut(),
304 &mut sz,
305 ptr::null_mut(),
306 0,
307 ))?;
308 if sz == 0 {
309 return Err(io::Error::last_os_error());
310 }
311 let mut v: Vec<u8> = Vec::with_capacity(sz);
312 cvt(libc::sysctl(
313 mib.as_mut_ptr(),
314 mib.len() as libc::c_uint,
315 v.as_mut_ptr() as *mut libc::c_void,
316 &mut sz,
317 ptr::null_mut(),
318 0,
319 ))?;
320 if sz == 0 {
321 return Err(io::Error::last_os_error());
322 }
323 v.set_len(sz - 1); Ok(PathBuf::from(OsString::from_vec(v)))
325 }
326}
327
328#[cfg(target_os = "netbsd")]
329pub fn current_exe() -> io::Result<PathBuf> {
330 fn sysctl() -> io::Result<PathBuf> {
331 unsafe {
332 let mib = [libc::CTL_KERN, libc::KERN_PROC_ARGS, -1, libc::KERN_PROC_PATHNAME];
333 let mut path_len: usize = 0;
334 cvt(libc::sysctl(
335 mib.as_ptr(),
336 mib.len() as libc::c_uint,
337 ptr::null_mut(),
338 &mut path_len,
339 ptr::null(),
340 0,
341 ))?;
342 if path_len <= 1 {
343 return Err(io::const_error!(
344 io::ErrorKind::Uncategorized,
345 "KERN_PROC_PATHNAME sysctl returned zero-length string",
346 ));
347 }
348 let mut path: Vec<u8> = Vec::with_capacity(path_len);
349 cvt(libc::sysctl(
350 mib.as_ptr(),
351 mib.len() as libc::c_uint,
352 path.as_ptr() as *mut libc::c_void,
353 &mut path_len,
354 ptr::null(),
355 0,
356 ))?;
357 path.set_len(path_len - 1); Ok(PathBuf::from(OsString::from_vec(path)))
359 }
360 }
361 fn procfs() -> io::Result<PathBuf> {
362 let curproc_exe = path::Path::new("/proc/curproc/exe");
363 if curproc_exe.is_file() {
364 return crate::fs::read_link(curproc_exe);
365 }
366 Err(io::const_error!(
367 io::ErrorKind::Uncategorized,
368 "/proc/curproc/exe doesn't point to regular file.",
369 ))
370 }
371 sysctl().or_else(|_| procfs())
372}
373
374#[cfg(target_os = "openbsd")]
375pub fn current_exe() -> io::Result<PathBuf> {
376 unsafe {
377 let mut mib = [libc::CTL_KERN, libc::KERN_PROC_ARGS, libc::getpid(), libc::KERN_PROC_ARGV];
378 let mib = mib.as_mut_ptr();
379 let mut argv_len = 0;
380 cvt(libc::sysctl(mib, 4, ptr::null_mut(), &mut argv_len, ptr::null_mut(), 0))?;
381 let mut argv = Vec::<*const libc::c_char>::with_capacity(argv_len as usize);
382 cvt(libc::sysctl(mib, 4, argv.as_mut_ptr() as *mut _, &mut argv_len, ptr::null_mut(), 0))?;
383 argv.set_len(argv_len as usize);
384 if argv[0].is_null() {
385 return Err(io::const_error!(io::ErrorKind::Uncategorized, "no current exe available"));
386 }
387 let argv0 = CStr::from_ptr(argv[0]).to_bytes();
388 if argv0[0] == b'.' || argv0.iter().any(|b| *b == b'/') {
389 crate::fs::canonicalize(OsStr::from_bytes(argv0))
390 } else {
391 Ok(PathBuf::from(OsStr::from_bytes(argv0)))
392 }
393 }
394}
395
396#[cfg(any(
397 target_os = "linux",
398 target_os = "hurd",
399 target_os = "android",
400 target_os = "nuttx",
401 target_os = "emscripten"
402))]
403pub fn current_exe() -> io::Result<PathBuf> {
404 match crate::fs::read_link("/proc/self/exe") {
405 Err(ref e) if e.kind() == io::ErrorKind::NotFound => Err(io::const_error!(
406 io::ErrorKind::Uncategorized,
407 "no /proc/self/exe available. Is /proc mounted?",
408 )),
409 other => other,
410 }
411}
412
413#[cfg(target_os = "nto")]
414pub fn current_exe() -> io::Result<PathBuf> {
415 let mut e = crate::fs::read("/proc/self/exefile")?;
416 if let Some(0) = e.last() {
419 e.pop();
420 }
421 Ok(PathBuf::from(OsString::from_vec(e)))
422}
423
424#[cfg(target_vendor = "apple")]
425pub fn current_exe() -> io::Result<PathBuf> {
426 unsafe {
427 let mut sz: u32 = 0;
428 #[expect(deprecated)]
429 libc::_NSGetExecutablePath(ptr::null_mut(), &mut sz);
430 if sz == 0 {
431 return Err(io::Error::last_os_error());
432 }
433 let mut v: Vec<u8> = Vec::with_capacity(sz as usize);
434 #[expect(deprecated)]
435 let err = libc::_NSGetExecutablePath(v.as_mut_ptr() as *mut i8, &mut sz);
436 if err != 0 {
437 return Err(io::Error::last_os_error());
438 }
439 v.set_len(sz as usize - 1); Ok(PathBuf::from(OsString::from_vec(v)))
441 }
442}
443
444#[cfg(any(target_os = "solaris", target_os = "illumos"))]
445pub fn current_exe() -> io::Result<PathBuf> {
446 if let Ok(path) = crate::fs::read_link("/proc/self/path/a.out") {
447 Ok(path)
448 } else {
449 unsafe {
450 let path = libc::getexecname();
451 if path.is_null() {
452 Err(io::Error::last_os_error())
453 } else {
454 let filename = CStr::from_ptr(path).to_bytes();
455 let path = PathBuf::from(<OsStr as OsStrExt>::from_bytes(filename));
456
457 if filename[0] == b'/' { Ok(path) } else { getcwd().map(|cwd| cwd.join(path)) }
460 }
461 }
462 }
463}
464
465#[cfg(target_os = "haiku")]
466pub fn current_exe() -> io::Result<PathBuf> {
467 let mut name = vec![0; libc::PATH_MAX as usize];
468 unsafe {
469 let result = libc::find_path(
470 crate::ptr::null_mut(),
471 libc::path_base_directory::B_FIND_PATH_IMAGE_PATH,
472 crate::ptr::null_mut(),
473 name.as_mut_ptr(),
474 name.len(),
475 );
476 if result != libc::B_OK {
477 use crate::io::ErrorKind;
478 Err(io::const_error!(ErrorKind::Uncategorized, "Error getting executable path"))
479 } else {
480 let name = CStr::from_ptr(name.as_ptr()).to_bytes();
482 Ok(PathBuf::from(OsStr::from_bytes(name)))
483 }
484 }
485}
486
487#[cfg(any(target_os = "redox", target_os = "rtems"))]
488pub fn current_exe() -> io::Result<PathBuf> {
489 crate::fs::read_to_string("sys:exe").map(PathBuf::from)
490}
491
492#[cfg(target_os = "l4re")]
493pub fn current_exe() -> io::Result<PathBuf> {
494 use crate::io::ErrorKind;
495 Err(io::const_error!(ErrorKind::Unsupported, "Not yet implemented!"))
496}
497
498#[cfg(target_os = "vxworks")]
499pub fn current_exe() -> io::Result<PathBuf> {
500 #[cfg(test)]
501 use realstd::env;
502
503 #[cfg(not(test))]
504 use crate::env;
505
506 let exe_path = env::args().next().unwrap();
507 let path = path::Path::new(&exe_path);
508 path.canonicalize()
509}
510
511#[cfg(any(target_os = "espidf", target_os = "horizon", target_os = "vita"))]
512pub fn current_exe() -> io::Result<PathBuf> {
513 super::unsupported::unsupported()
514}
515
516#[cfg(target_os = "fuchsia")]
517pub fn current_exe() -> io::Result<PathBuf> {
518 #[cfg(test)]
519 use realstd::env;
520
521 #[cfg(not(test))]
522 use crate::env;
523 use crate::io::ErrorKind;
524
525 let exe_path = env::args().next().ok_or(io::const_error!(
526 ErrorKind::Uncategorized,
527 "an executable path was not found because no arguments were provided through argv",
528 ))?;
529 let path = PathBuf::from(exe_path);
530
531 if !path.is_absolute() { getcwd().map(|cwd| cwd.join(path)) } else { Ok(path) }
533}
534
535pub struct Env {
536 iter: vec::IntoIter<(OsString, OsString)>,
537}
538
539pub struct EnvStrDebug<'a> {
541 slice: &'a [(OsString, OsString)],
542}
543
544impl fmt::Debug for EnvStrDebug<'_> {
545 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
546 let Self { slice } = self;
547 f.debug_list()
548 .entries(slice.iter().map(|(a, b)| (a.to_str().unwrap(), b.to_str().unwrap())))
549 .finish()
550 }
551}
552
553impl Env {
554 pub fn str_debug(&self) -> impl fmt::Debug + '_ {
555 let Self { iter } = self;
556 EnvStrDebug { slice: iter.as_slice() }
557 }
558}
559
560impl fmt::Debug for Env {
561 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
562 let Self { iter } = self;
563 f.debug_list().entries(iter.as_slice()).finish()
564 }
565}
566
567impl !Send for Env {}
568impl !Sync for Env {}
569
570impl Iterator for Env {
571 type Item = (OsString, OsString);
572 fn next(&mut self) -> Option<(OsString, OsString)> {
573 self.iter.next()
574 }
575 fn size_hint(&self) -> (usize, Option<usize>) {
576 self.iter.size_hint()
577 }
578}
579
580#[cfg(target_vendor = "apple")]
604pub unsafe fn environ() -> *mut *const *const c_char {
605 libc::_NSGetEnviron() as *mut *const *const c_char
606}
607
608#[cfg(not(target_vendor = "apple"))]
610pub unsafe fn environ() -> *mut *const *const c_char {
611 unsafe extern "C" {
612 static mut environ: *const *const c_char;
613 }
614 &raw mut environ
615}
616
617static ENV_LOCK: RwLock<()> = RwLock::new(());
618
619pub fn env_read_lock() -> impl Drop {
620 ENV_LOCK.read().unwrap_or_else(PoisonError::into_inner)
621}
622
623pub fn env() -> Env {
626 unsafe {
627 let _guard = env_read_lock();
628 let mut environ = *environ();
629 let mut result = Vec::new();
630 if !environ.is_null() {
631 while !(*environ).is_null() {
632 if let Some(key_value) = parse(CStr::from_ptr(*environ).to_bytes()) {
633 result.push(key_value);
634 }
635 environ = environ.add(1);
636 }
637 }
638 return Env { iter: result.into_iter() };
639 }
640
641 fn parse(input: &[u8]) -> Option<(OsString, OsString)> {
642 if input.is_empty() {
647 return None;
648 }
649 let pos = memchr::memchr(b'=', &input[1..]).map(|p| p + 1);
650 pos.map(|p| {
651 (
652 OsStringExt::from_vec(input[..p].to_vec()),
653 OsStringExt::from_vec(input[p + 1..].to_vec()),
654 )
655 })
656 }
657}
658
659pub fn getenv(k: &OsStr) -> Option<OsString> {
660 run_with_cstr(k.as_bytes(), &|k| {
663 let _guard = env_read_lock();
664 let v = unsafe { libc::getenv(k.as_ptr()) } as *const libc::c_char;
665
666 if v.is_null() {
667 Ok(None)
668 } else {
669 let bytes = unsafe { CStr::from_ptr(v) }.to_bytes().to_vec();
671
672 Ok(Some(OsStringExt::from_vec(bytes)))
673 }
674 })
675 .ok()
676 .flatten()
677}
678
679pub unsafe fn setenv(k: &OsStr, v: &OsStr) -> io::Result<()> {
680 run_with_cstr(k.as_bytes(), &|k| {
681 run_with_cstr(v.as_bytes(), &|v| {
682 let _guard = ENV_LOCK.write();
683 cvt(libc::setenv(k.as_ptr(), v.as_ptr(), 1)).map(drop)
684 })
685 })
686}
687
688pub unsafe fn unsetenv(n: &OsStr) -> io::Result<()> {
689 run_with_cstr(n.as_bytes(), &|nbuf| {
690 let _guard = ENV_LOCK.write();
691 cvt(libc::unsetenv(nbuf.as_ptr())).map(drop)
692 })
693}
694
695#[cfg(not(target_os = "espidf"))]
696pub fn page_size() -> usize {
697 unsafe { libc::sysconf(libc::_SC_PAGESIZE) as usize }
698}
699
700#[cfg(all(target_vendor = "apple", not(miri)))]
709fn confstr(key: c_int, size_hint: Option<usize>) -> io::Result<OsString> {
710 let mut buf: Vec<u8> = Vec::with_capacity(0);
711 let mut bytes_needed_including_nul = size_hint
712 .unwrap_or_else(|| {
713 unsafe { libc::confstr(key, core::ptr::null_mut(), 0) }
718 })
719 .max(1);
720 while bytes_needed_including_nul > buf.capacity() {
725 buf.reserve(bytes_needed_including_nul);
731 bytes_needed_including_nul =
738 unsafe { libc::confstr(key, buf.as_mut_ptr().cast::<c_char>(), buf.capacity()) };
739 }
740 if bytes_needed_including_nul == 0 {
742 return Err(io::Error::last_os_error());
743 }
744 unsafe {
748 buf.set_len(bytes_needed_including_nul);
749 let last_byte = buf.pop();
751 assert_eq!(last_byte, Some(0), "`confstr` provided a string which wasn't nul-terminated");
753 };
754 Ok(OsString::from_vec(buf))
755}
756
757#[cfg(all(target_vendor = "apple", not(miri)))]
758fn darwin_temp_dir() -> PathBuf {
759 confstr(libc::_CS_DARWIN_USER_TEMP_DIR, Some(64)).map(PathBuf::from).unwrap_or_else(|_| {
760 PathBuf::from("/tmp")
763 })
764}
765
766pub fn temp_dir() -> PathBuf {
767 crate::env::var_os("TMPDIR").map(PathBuf::from).unwrap_or_else(|| {
768 cfg_if::cfg_if! {
769 if #[cfg(all(target_vendor = "apple", not(miri)))] {
770 darwin_temp_dir()
771 } else if #[cfg(target_os = "android")] {
772 PathBuf::from("/data/local/tmp")
773 } else {
774 PathBuf::from("/tmp")
775 }
776 }
777 })
778}
779
780pub fn home_dir() -> Option<PathBuf> {
781 return crate::env::var_os("HOME").or_else(|| unsafe { fallback() }).map(PathBuf::from);
782
783 #[cfg(any(
784 target_os = "android",
785 target_os = "emscripten",
786 target_os = "redox",
787 target_os = "vxworks",
788 target_os = "espidf",
789 target_os = "horizon",
790 target_os = "vita",
791 target_os = "nuttx",
792 all(target_vendor = "apple", not(target_os = "macos")),
793 ))]
794 unsafe fn fallback() -> Option<OsString> {
795 None
796 }
797 #[cfg(not(any(
798 target_os = "android",
799 target_os = "emscripten",
800 target_os = "redox",
801 target_os = "vxworks",
802 target_os = "espidf",
803 target_os = "horizon",
804 target_os = "vita",
805 target_os = "nuttx",
806 all(target_vendor = "apple", not(target_os = "macos")),
807 )))]
808 unsafe fn fallback() -> Option<OsString> {
809 let amt = match libc::sysconf(libc::_SC_GETPW_R_SIZE_MAX) {
810 n if n < 0 => 512 as usize,
811 n => n as usize,
812 };
813 let mut buf = Vec::with_capacity(amt);
814 let mut p = mem::MaybeUninit::<libc::passwd>::uninit();
815 let mut result = ptr::null_mut();
816 match libc::getpwuid_r(
817 libc::getuid(),
818 p.as_mut_ptr(),
819 buf.as_mut_ptr(),
820 buf.capacity(),
821 &mut result,
822 ) {
823 0 if !result.is_null() => {
824 let ptr = (*result).pw_dir as *const _;
825 let bytes = CStr::from_ptr(ptr).to_bytes().to_vec();
826 Some(OsStringExt::from_vec(bytes))
827 }
828 _ => None,
829 }
830 }
831}
832
833pub fn exit(code: i32) -> ! {
834 crate::sys::exit_guard::unique_thread_exit();
835 unsafe { libc::exit(code as c_int) }
836}
837
838pub fn getpid() -> u32 {
839 unsafe { libc::getpid() as u32 }
840}
841
842pub fn getppid() -> u32 {
843 unsafe { libc::getppid() as u32 }
844}
845
846#[cfg(all(target_os = "linux", target_env = "gnu"))]
847pub fn glibc_version() -> Option<(usize, usize)> {
848 unsafe extern "C" {
849 fn gnu_get_libc_version() -> *const libc::c_char;
850 }
851 let version_cstr = unsafe { CStr::from_ptr(gnu_get_libc_version()) };
852 if let Ok(version_str) = version_cstr.to_str() {
853 parse_glibc_version(version_str)
854 } else {
855 None
856 }
857}
858
859#[cfg(all(target_os = "linux", target_env = "gnu"))]
862fn parse_glibc_version(version: &str) -> Option<(usize, usize)> {
863 let mut parsed_ints = version.split('.').map(str::parse::<usize>).fuse();
864 match (parsed_ints.next(), parsed_ints.next()) {
865 (Some(Ok(major)), Some(Ok(minor))) => Some((major, minor)),
866 _ => None,
867 }
868}