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annotate rust/chg/src/procutil.rs @ 52664:f5091286b10c

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packaging: modernize (compat PEP 517) with less distutils and setup.py calls - setup.py: less distutils imports and setuptools required distutils is deprecated and one should import commands from setuptools to support modern workflows depending on PEP 517 and 518. Moreover, for Python >=3.12, distutils comes from setuptools. It corresponds to old and unmaintain code that do not support PEP 517. The PEP 517 frontends (pip, build, pipx, PDM, UV, etc.) are responsible for creating a venv just for the build. The build dependencies (currently only setuptools) are specified in the pyproject.toml file. Therefore, there is no reason to support building without setuptools. Calling directly setup.py is deprecated and we have to use a PEP 517 frontend. For this commit we use pip with venv. - run-tests.py: install with pip instead of direct call of setup.py Mercurial is then built in an isolated environment. - Makefile: use venv+pip instead of setup.py
author paugier <pierre.augier@univ-grenoble-alpes.fr>
date Wed, 08 Jan 2025 05:07:00 +0100
parents 426294d06ddc
children
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1 // Copyright 2018 Yuya Nishihara <yuya@tcha.org>
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2 //
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3 // This software may be used and distributed according to the terms of the
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4 // GNU General Public License version 2 or any later version.
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5
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6 //! Low-level utility for signal and process handling.
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7
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8 use libc::{self, c_int, pid_t, size_t, ssize_t};
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9 use std::io;
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10 use std::os::unix::io::RawFd;
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11 use std::sync;
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12
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13 #[link(name = "procutil", kind = "static")]
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14 extern "C" {
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15 // sendfds.c
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16 fn sendfds(sockfd: c_int, fds: *const c_int, fdlen: size_t) -> ssize_t;
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17
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18 // sighandlers.c
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19 fn setupsignalhandler(pid: pid_t, pgid: pid_t) -> c_int;
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20 fn restoresignalhandler() -> c_int;
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21 }
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22
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23 /// Returns the effective uid of the current process.
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24 pub fn get_effective_uid() -> u32 {
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25 unsafe { libc::geteuid() }
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26 }
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27
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28 /// Returns the umask of the current process.
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29 ///
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30 /// # Safety
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31 ///
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32 /// This is unsafe because the umask value is temporarily changed, and
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33 /// the change can be observed from the other threads. Don't call this in
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34 /// multi-threaded context.
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35 pub unsafe fn get_umask() -> u32 {
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36 let mask = libc::umask(0);
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37 libc::umask(mask);
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38 mask
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39 }
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40
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41 /// Changes the given fd to blocking mode.
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42 pub fn set_blocking_fd(fd: RawFd) -> io::Result<()> {
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43 let flags = unsafe { libc::fcntl(fd, libc::F_GETFL) };
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44 if flags < 0 {
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45 return Err(io::Error::last_os_error());
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46 }
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47 let r =
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48 unsafe { libc::fcntl(fd, libc::F_SETFL, flags & !libc::O_NONBLOCK) };
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49 if r < 0 {
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50 return Err(io::Error::last_os_error());
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51 }
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52 Ok(())
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53 }
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54
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55 /// Sends file descriptors via the given socket.
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56 pub fn send_raw_fds(sock_fd: RawFd, fds: &[RawFd]) -> io::Result<()> {
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57 let r = unsafe { sendfds(sock_fd, fds.as_ptr(), fds.len() as size_t) };
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58 if r < 0 {
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59 return Err(io::Error::last_os_error());
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60 }
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61 Ok(())
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62 }
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63
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64 static SETUP_SIGNAL_HANDLER: sync::Once = sync::Once::new();
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65 static RESTORE_SIGNAL_HANDLER: sync::Once = sync::Once::new();
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66
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67 /// Installs signal handlers to forward signals to the server.
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68 ///
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69 /// # Safety
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70 ///
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71 /// This touches global states, and thus synchronized as a one-time
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72 /// initialization function.
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73 pub fn setup_signal_handler_once(
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74 pid: u32,
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75 pgid: Option<u32>,
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76 ) -> io::Result<()> {
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77 let pid_signed = pid as i32;
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78 let pgid_signed = pgid.map(|n| n as i32).unwrap_or(0);
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79 let mut r = 0;
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80 SETUP_SIGNAL_HANDLER.call_once(|| {
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81 r = unsafe { setupsignalhandler(pid_signed, pgid_signed) };
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82 });
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83 if r < 0 {
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84 return Err(io::Error::last_os_error());
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85 }
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86 Ok(())
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87 }
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88
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89 /// Restores the original signal handlers.
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90 ///
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91 /// # Safety
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92 ///
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93 /// This touches global states, and thus synchronized as a one-time
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94 /// initialization function.
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95 pub fn restore_signal_handler_once() -> io::Result<()> {
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96 let mut r = 0;
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97 RESTORE_SIGNAL_HANDLER.call_once(|| {
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98 r = unsafe { restoresignalhandler() };
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99 });
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100 if r < 0 {
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101 return Err(io::Error::last_os_error());
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102 }
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103 Ok(())
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104 }