mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 11:37:35 +00:00
94 lines
4.4 KiB
C
94 lines
4.4 KiB
C
/*-*- 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/calls.h"
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#include "libc/calls/pledge.h"
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#include "libc/calls/pledge.internal.h"
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#include "libc/calls/syscall-nt.internal.h"
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#include "libc/calls/syscall-sysv.internal.h"
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#include "libc/dce.h"
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#include "libc/intrin/describeflags.h"
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#include "libc/intrin/likely.h"
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#include "libc/intrin/promises.h"
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#include "libc/intrin/strace.h"
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#include "libc/intrin/weaken.h"
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#include "libc/log/libfatal.internal.h"
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#include "libc/runtime/runtime.h"
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#include "libc/runtime/zipos.internal.h"
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#include "libc/sysv/consts/o.h"
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#include "libc/sysv/errfuns.h"
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/**
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* Replaces current process with program.
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*
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* On Windows, `argv` and `envp` can't contain binary strings. They need
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* to be valid UTF-8 in order to round-trip the WIN32 API, without being
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* corrupted.
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*
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* On Windows, only file descriptors 0, 1 and 2 can be passed to a child
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* process in such a way that allows them to be automatically discovered
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* when the child process initializes. Cosmpolitan currently treats your
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* other file descriptors as implicitly O_CLOEXEC.
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*
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* @param program will not be PATH searched, see commandv()
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* @param argv[0] is the name of the program to run
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* @param argv[1,n-2] optionally specify program arguments
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* @param argv[n-1] is NULL
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* @param envp[0,n-2] specifies "foo=bar" environment variables
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* @param envp[n-1] is NULL
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* @return doesn't return, or -1 w/ errno
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* @raise ETXTBSY if another process has `prog` open in write mode
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* @raise ENOEXEC if file is executable but not a valid format
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* @raise ENOMEM if remaining stack memory is insufficient
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* @raise EACCES if execute permission was denied
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* @asyncsignalsafe
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* @vforksafe
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*/
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int execve(const char *prog, char *const argv[], char *const envp[]) {
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int rc;
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struct ZiposUri uri;
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if (!prog || !argv || !envp) {
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rc = efault();
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} else {
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STRACE("execve(%#s, %s, %s)", prog, DescribeStringList(argv),
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DescribeStringList(envp));
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rc = 0;
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if (IsLinux() && __execpromises && _weaken(sys_pledge_linux)) {
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rc = _weaken(sys_pledge_linux)(__execpromises, __pledge_mode);
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}
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if (!rc) {
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if (0 && _weaken(__zipos_parseuri) &&
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(_weaken(__zipos_parseuri)(prog, &uri) != -1)) {
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rc = _weaken(__zipos_open)(&uri, O_RDONLY | O_CLOEXEC);
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if (rc != -1) {
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const int zipFD = rc;
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strace_enabled(-1);
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rc = fexecve(zipFD, argv, envp);
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close(zipFD);
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strace_enabled(+1);
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}
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} else if (!IsWindows()) {
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rc = sys_execve(prog, argv, envp);
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} else {
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rc = sys_execve_nt(prog, argv, envp);
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}
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}
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}
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STRACE("execve(%#s) failed %d% m", prog, rc);
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return rc;
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}
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