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394d998315
At least in neovim, `│vi:` is not recognized as a modeline because it has no preceding whitespace. After fixing this, opening a file yields an error because `net` is not an option. (`noet`, however, is.)
83 lines
3.7 KiB
C
83 lines
3.7 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set noet 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/dce.h"
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#include "libc/intrin/asan.internal.h"
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#include "libc/limits.h"
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#include "libc/mem/alloca.h"
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#include "libc/mem/mem.h"
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#include "libc/runtime/runtime.h"
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#include "libc/runtime/stack.h"
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#include "libc/str/str.h"
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#include "libc/sysv/errfuns.h"
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/**
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* Executes program, with path environment search.
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*
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* This function is a wrapper of the execve() system call that does path
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* resolution. The `PATH` environment variable is taken from your global
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* `environ` rather than the `envp` argument.
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*
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* @param prog is the program to launch
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* @param argv is [file,argv₁..argvₙ₋₁,NULL]
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* @param envp is ["key=val",...,NULL]
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* @return doesn't return on success, otherwise -1 w/ errno
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* @asyncsignalsafe
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* @vforksafe
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*/
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int execvpe(const char *prog, char *const argv[], char *const *envp) {
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size_t i;
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char *exe, **argv2;
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char pathbuf[PATH_MAX];
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// validate memory
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if (IsAsan() &&
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(!__asan_is_valid_str(prog) || !__asan_is_valid_strlist(argv))) {
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return efault();
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}
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if (strchr(prog, '/')) {
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return execve(prog, argv, envp);
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}
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// resolve path of executable
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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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// change argv[0] to resolved path if it's ambiguous
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// otherwise the program won't have much luck finding itself
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if (argv[0] && *prog != '/' && *exe == '/' && !strcmp(prog, argv[0])) {
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for (i = 0; argv[i++];) (void)0;
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#pragma GCC push_options
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#pragma GCC diagnostic ignored "-Walloca-larger-than="
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int nbytes = i * sizeof(*argv);
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if (__get_safe_size(nbytes, 4096) < nbytes) return enomem();
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argv2 = alloca(nbytes);
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CheckLargeStackAllocation(argv2, nbytes);
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#pragma GCC pop_options
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memcpy(argv2, argv, nbytes);
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argv2[0] = exe;
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argv = argv2;
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}
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// execute program
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// tail call shouldn't be possible
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return execve(exe, argv, envp);
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}
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