mirror of
https://github.com/jart/cosmopolitan.git
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40eb3b9d5d
This change (1) upgrades to OpenBSD's newer kernel ABIs, and (2)
modifies APE to have a read-only data segment. Doing this required
creating APE Loader v1.1, which is backwards and forwards compatible
with the previous version.
If you've run the following commands in the past to install your APE
Loader systemwide, then you need to run them again. Ad-hoc installations
shouldn't be impacted. It's also recommended that APE binaries be remade
after upgrading, since they embed old versions of the APE Loader.
ape/apeuninstall.sh
ape/apeinstall.sh
This change does more than just fix OpenBSD. The new loader is smarter
and more reliable. We're now able create much tinier ELF and Mach-O data
structures than we could before. Both APE Loader and execvpe() will now
normalize ambiguous argv[0] resolution the same way as the UNIX shell.
Badness with TLS linkage has been solved.
Fixes #826
72 lines
3.2 KiB
C
72 lines
3.2 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 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/mem/alloca.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/errfuns.h"
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/**
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* Executes program, with PATH search and current environment.
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*
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* The current process is replaced with the executed one.
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*
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* @param prog is program to launch (may be PATH searched)
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* @param arg[0] is the name of the program to run
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* @param arg[1,n-2] optionally specify program arguments
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* @param arg[n-1] is 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 execlp(const char *prog, const char *arg, ... /*, NULL*/) {
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int i;
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char *exe;
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char **argv;
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va_list va, vb;
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char pathbuf[PATH_MAX];
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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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// turn varargs into array
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va_copy(vb, va);
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va_start(va, arg);
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for (i = 0; va_arg(va, const char *); ++i) (void)0;
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va_end(va);
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argv = alloca((i + 2) * sizeof(char *));
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va_start(vb, arg);
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argv[0] = arg;
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for (i = 1;; ++i) {
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if (!(argv[i] = va_arg(vb, const char *))) break;
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}
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va_end(vb);
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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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argv[0] = exe;
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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 execv(exe, argv);
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}
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