cosmopolitan/libc/calls/execve-sysv.c
Justine Tunney e96aceae41 Bump support up to FreeBSD 13 and NetBSD 9.2
These releases are really exciting since they contained the patches we
worked to get upstreamed. It means that their /bin/sh interpreters all
work fine with Actually Portable Executable now.
2022-06-11 10:36:17 -07:00

93 lines
3.7 KiB
C

/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2021 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/bits/bits.h"
#include "libc/bits/safemacros.internal.h"
#include "libc/calls/calls.h"
#include "libc/calls/syscall-sysv.internal.h"
#include "libc/dce.h"
#include "libc/errno.h"
#include "libc/intrin/kprintf.h"
#include "libc/mem/alloca.h"
#include "libc/paths.h"
#include "libc/runtime/runtime.h"
#include "libc/str/str.h"
#include "libc/sysv/consts/at.h"
#include "libc/sysv/consts/o.h"
#include "libc/sysv/consts/ok.h"
#include "libc/sysv/errfuns.h"
static bool CanExecute(const char *path) {
return !sys_faccessat(AT_FDCWD, path, X_OK, 0);
}
static bool IsApeBinary(const char *path) {
int fd;
char buf[8];
bool res = false;
if ((fd = sys_open(path, O_RDONLY, 0)) != -1) {
if (sys_read(fd, buf, 8) == 8 && READ64LE(buf) == READ64LE("MZqFpD='")) {
res = true;
}
sys_close(fd);
}
return res;
}
static const char *Join(const char *a, const char *b, char buf[PATH_MAX]) {
size_t n, m;
n = strlen(a);
m = strlen(b);
if (n + 1 + m + 1 < PATH_MAX) {
stpcpy(stpcpy(stpcpy(buf, a), "/"), b);
return buf;
} else {
return "";
}
}
int sys_execve(const char *prog, char *const argv[], char *const envp[]) {
int e;
size_t i;
char *buf;
char **shargs;
const char *ape;
e = errno;
__sys_execve(prog, argv, envp);
if (errno != ENOEXEC) return -1;
for (i = 0; argv[i];) ++i;
buf = alloca(PATH_MAX);
shargs = alloca((i + 4) * sizeof(char *));
if (IsApeBinary(prog) &&
(CanExecute((ape = "/usr/bin/ape")) ||
CanExecute(
(ape = Join(firstnonnull(getenv("TMPDIR"), "/tmp"), "ape", buf))))) {
shargs[0] = ape;
shargs[1] = "-";
shargs[2] = prog;
memcpy(shargs + 3, argv, (i + 1) * sizeof(char *));
} else if (CanExecute(prog)) {
shargs[0] = _PATH_BSHELL;
shargs[1] = prog;
memcpy(shargs + 2, argv + 1, i * sizeof(char *));
} else {
return enoexec();
}
errno = e;
return __sys_execve(shargs[0], shargs, envp);
}