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https://github.com/jart/cosmopolitan.git
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Strongly link glob() into system() and popen()
This commit is contained in:
Justine Tunney
parent
4e9566cd33
commit
cafdb456ed
24 changed files with 216 additions and 59 deletions
1148
libc/proc/cocmd.c
1148
libc/proc/cocmd.c
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/calls/blockcancel.internal.h"
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#include "libc/calls/calls.h"
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#include "libc/calls/struct/rusage.h"
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#include "libc/calls/struct/sigaction.h"
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#include "libc/dce.h"
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#include "libc/errno.h"
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#include "libc/intrin/weaken.h"
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#include "libc/log/log.h"
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#include "libc/paths.h"
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#include "libc/runtime/runtime.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/ok.h"
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#include "libc/sysv/consts/sig.h"
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#include "libc/thread/thread.h"
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/**
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* Launches program with system command interpreter.
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*
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* This implementation embeds the Cosmopolitan Command Interpreter which
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* provides Bourne-like syntax on all platforms, including Windows. Many
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* builtin commands are included, e.g. exit, cd, rm, [, cat, wait, exec,
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* env, echo, read, true, test, kill, touch, rmdir, mkdir, false, mktemp
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* and usleep. It's also possible to __static_yoink() the symbols `_tr`,
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* `_sed`, `_awk`, and `_curl` for the tr, sed, awk and curl commands if
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* you're using the Cosmopolitan mono-repo.
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*
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* If you just have a program name and arguments, and you don't need the
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* full power of a UNIX-like shell, then consider using the Cosmopolitan
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* provided API systemvpe() instead. It provides a safer alternative for
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* variable arguments than shell script escaping. It lets you clean your
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* environment variables, for even more safety. Finally it's 10x faster.
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*
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* It's important to check the returned status code. For example, if you
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* press CTRL-C while running your program you'll expect it to terminate
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* however that won't be the case if the SIGINT gets raised while inside
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* the system() function. If the child process doesn't handle the signal
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* then this will return e.g. WIFSIGNALED(ws) && WTERMSIG(ws) == SIGINT.
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*
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* @param cmdline is a unix shell script
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* @return -1 if child process couldn't be created, otherwise a wait
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* status that can be accessed using macros like WEXITSTATUS(s),
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* WIFSIGNALED(s), WTERMSIG(s), etc.
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* @see systemve()
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* @threadsafe
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*/
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int system(const char *cmdline) {
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int pid, wstatus;
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sigset_t chldmask, savemask;
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if (!cmdline)
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return 1;
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sigemptyset(&chldmask);
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sigaddset(&chldmask, SIGINT);
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sigaddset(&chldmask, SIGQUIT);
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sigaddset(&chldmask, SIGCHLD);
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sigprocmask(SIG_BLOCK, &chldmask, &savemask);
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if (!(pid = fork())) {
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sigprocmask(SIG_SETMASK, &savemask, 0);
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_Exit(_cocmd(3, (char *[]){"system", "-c", (char *)cmdline, 0}, environ));
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} else if (pid == -1) {
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wstatus = -1;
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} else {
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struct sigaction ignore, saveint, savequit;
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ignore.sa_flags = 0;
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ignore.sa_handler = SIG_IGN;
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sigemptyset(&ignore.sa_mask);
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sigaction(SIGINT, &ignore, &saveint);
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sigaction(SIGQUIT, &ignore, &savequit);
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BLOCK_CANCELATION;
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while (wait4(pid, &wstatus, 0, 0) == -1) {
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if (errno != EINTR) {
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wstatus = -1;
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break;
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}
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}
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ALLOW_CANCELATION;
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sigaction(SIGQUIT, &savequit, 0);
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sigaction(SIGINT, &saveint, 0);
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}
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sigprocmask(SIG_SETMASK, &savemask, 0);
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return wstatus;
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}
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@ -1,89 +0,0 @@
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2023 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/calls/blockcancel.internal.h"
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#include "libc/calls/calls.h"
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#include "libc/calls/struct/rusage.h"
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#include "libc/calls/struct/sigaction.h"
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#include "libc/calls/struct/sigset.h"
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#include "libc/errno.h"
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#include "libc/limits.h"
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#include "libc/runtime/runtime.h"
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#include "libc/stdio/stdio.h"
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#include "libc/sysv/consts/sig.h"
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/**
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* Executes program and waits for it to complete, e.g.
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*
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* systemvpe("ls", (char *[]){"ls", dir, 0}, environ);
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*
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* This function is designed to do the same thing as system() except
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* rather than taking a shell script argument it accepts an array of
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* strings which are safely passed directly to execve().
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*
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* This function is 5x faster than system() and generally safer, for
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* most command running use cases that don't need to control the i/o
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* file descriptors.
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*
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* @param prog is path searched (if it doesn't contain a slash) from
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* the $PATH environment variable in `environ` (not your `envp`)
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* @return -1 if child process couldn't be created, otherwise a wait
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* status that can be accessed using macros like WEXITSTATUS(s),
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* WIFSIGNALED(s), WTERMSIG(s), etc.
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* @see system()
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*/
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int systemvpe(const char *prog, char *const argv[], char *const envp[]) {
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char *exe;
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int pid, wstatus;
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char pathbuf[PATH_MAX + 1];
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sigset_t chldmask, savemask;
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if (!(exe = commandv(prog, pathbuf, sizeof(pathbuf)))) {
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return -1;
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}
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sigemptyset(&chldmask);
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sigaddset(&chldmask, SIGINT);
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sigaddset(&chldmask, SIGQUIT);
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sigaddset(&chldmask, SIGCHLD);
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sigprocmask(SIG_BLOCK, &chldmask, &savemask);
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if (!(pid = vfork())) {
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sigprocmask(SIG_SETMASK, &savemask, 0);
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execve(prog, argv, envp);
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_Exit(127);
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} else if (pid == -1) {
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wstatus = -1;
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} else {
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struct sigaction ignore, saveint, savequit;
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ignore.sa_flags = 0;
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ignore.sa_handler = SIG_IGN;
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sigemptyset(&ignore.sa_mask);
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sigaction(SIGINT, &ignore, &saveint);
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sigaction(SIGQUIT, &ignore, &savequit);
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BLOCK_CANCELATION;
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while (wait4(pid, &wstatus, 0, 0) == -1) {
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if (errno != EINTR) {
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wstatus = -1;
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break;
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}
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}
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ALLOW_CANCELATION;
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sigaction(SIGQUIT, &savequit, 0);
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sigaction(SIGINT, &saveint, 0);
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}
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sigprocmask(SIG_SETMASK, &savemask, 0);
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return wstatus;
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}
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