mirror of
https://github.com/jart/cosmopolitan.git
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7e0a09feec
This change ports APE Loader to Linux AARCH64, so that Raspberry Pi users can run programs like redbean, without the executable needing to modify itself. Progress has also slipped into this change on the issue of making progress better conforming to user expectations and industry standards regarding which symbols we're allowed to declare
99 lines
4.2 KiB
C
99 lines
4.2 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2021 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/assert.h"
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#include "libc/calls/calls.h"
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#include "libc/errno.h"
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#include "libc/intrin/weaken.h"
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#include "libc/paths.h"
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#include "libc/runtime/runtime.h"
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#include "libc/stdio/internal.h"
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#include "libc/stdio/stdio.h"
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#include "libc/sysv/consts/f.h"
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#include "libc/sysv/consts/fd.h"
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#include "libc/sysv/consts/o.h"
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#include "libc/sysv/errfuns.h"
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#include "libc/thread/thread.h"
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/**
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* Spawns subprocess and returns pipe stream.
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*
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* The returned resource needs to be passed to pclose().
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*
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* This embeds the Cosmopolitan Command Interpreter which provides
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* Bourne-like syntax on all platforms including Windows.
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*
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* @param cmdline is a unix shell script
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* @param mode can be:
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* - `"r"` for reading from subprocess standard output
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* - `"w"` for writing to subprocess standard input
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* @raise EINVAL if `mode` is invalid or specifies read+write
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* @raise EMFILE if process `RLIMIT_NOFILE` has been reached
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* @raise ENFILE if system-wide file limit has been reached
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* @raise ECANCELED if thread was cancelled in masked mode
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* @raise ENOMEM if we require more vespene gas
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* @raise EAGAIN if `RLIMIT_NPROC` was exceeded
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* @raise EINTR if signal was delivered
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* @cancellationpoint
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* @threadsafe
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*/
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FILE *popen(const char *cmdline, const char *mode) {
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FILE *f;
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int e, rc, pid, dir, flags, pipefds[2];
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flags = fopenflags(mode);
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if ((flags & O_ACCMODE) == O_RDONLY) {
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dir = 0;
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} else if ((flags & O_ACCMODE) == O_WRONLY) {
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dir = 1;
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} else {
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einval();
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return NULL;
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}
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if (_weaken(pthread_testcancel_np) &&
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(rc = _weaken(pthread_testcancel_np)())) {
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errno = rc;
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return 0;
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}
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if (pipe2(pipefds, O_CLOEXEC) == -1) return NULL;
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if ((f = fdopen(pipefds[dir], mode))) {
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switch ((pid = fork())) {
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case 0:
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unassert(dup2(pipefds[!dir], !dir) == !dir);
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// we can't rely on cloexec because cocmd builtins don't execve
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if (pipefds[0] != !dir) unassert(!close(pipefds[0]));
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if (pipefds[1] != !dir) unassert(!close(pipefds[1]));
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_Exit(_cocmd(3, (char *[]){"popen", "-c", cmdline, 0}, environ));
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default:
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f->pid = pid;
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unassert(!close(pipefds[!dir]));
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return f;
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case -1:
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e = errno;
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unassert(!fclose(f));
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unassert(!close(pipefds[!dir]));
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errno = e;
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return NULL;
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}
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} else {
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e = errno;
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unassert(!close(pipefds[0]));
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unassert(!close(pipefds[1]));
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errno = e;
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return NULL;
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}
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}
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