db33973e0a
This is done without using Microsoft's internal APIs. MAP_PRIVATE mappings are copied to the subprocess via a pipe, since Microsoft doesn't want us to have proper COW pages. MAP_SHARED mappings are remapped without needing to do any copying. Global variables need copying along with the stack and the whole heap of anonymous mem. This actually improves the reliability of the redbean http server although one shouldn't expect 10k+ connections on a home computer that isn't running software built to serve like Linux or FreeBSD.
125 lines
5.0 KiB
C
125 lines
5.0 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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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/bits/progn.h"
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#include "libc/bits/safemacros.h"
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#include "libc/calls/calls.h"
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#include "libc/conv/conv.h"
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#include "libc/dce.h"
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#include "libc/errno.h"
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#include "libc/nt/ntdll.h"
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#include "libc/runtime/missioncritical.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/consts/ok.h"
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#include "libc/sysv/errfuns.h"
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static int accessexe(char pathname[hasatleast PATH_MAX], size_t len,
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const char *ext) {
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len = stpcpy(&pathname[len], ext) - &pathname[0];
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if (isexecutable(pathname)) {
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return len;
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} else {
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return -1;
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}
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}
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static int accesscmd(char pathname[hasatleast PATH_MAX], const char *path,
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const char *name, size_t namelen) { /* cf. %PATHEXT% */
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int rc;
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char *p;
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bool hasdot;
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size_t pathlen, len;
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pathlen = strlen(path);
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if (pathlen + 1 + namelen + 1 + 4 + 1 > PATH_MAX) return -1;
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p = mempcpy(pathname, path, pathlen);
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if (pathlen && pathname[pathlen - 1] != '/') *p++ = '/';
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p = mempcpy(p, name, namelen);
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len = p - &pathname[0];
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hasdot = !!memchr(basename(name), '.', namelen);
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if ((hasdot && (rc = accessexe(pathname, len, "")) != -1) ||
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(!hasdot &&
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((rc = accessexe(pathname, len, ".com")) != -1 ||
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(IsWindows() && (rc = accessexe(pathname, len, ".exe")) != -1) ||
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(!IsWindows() && (rc = accessexe(pathname, len, "")) != -1)))) {
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return rc;
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} else {
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return -1;
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}
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}
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static int searchcmdpath(char pathname[hasatleast PATH_MAX], const char *name,
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size_t namelen) {
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int rc;
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char *path, *pathtok, ep[PATH_MAX];
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rc = -1;
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if (!memccpy(ep,
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firstnonnull(emptytonull(getenv("PATH")),
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"/bin:/usr/local/bin:/usr/bin"),
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'\0', sizeof(ep))) {
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return enomem();
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}
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pathtok = ep;
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while ((path = strsep(&pathtok, IsWindows() ? ";" : ":"))) {
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if (strchr(path, '=')) continue;
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if ((rc = accesscmd(pathname, path, name, namelen)) != -1) {
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break;
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}
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}
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return rc;
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}
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static char *mkcmdquery(const char *name, size_t namelen,
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char scratch[hasatleast PATH_MAX]) {
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char *p;
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if (namelen + 1 + 1 > PATH_MAX) return NULL;
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p = mempcpy(scratch, name, namelen);
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*p++ = '=';
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*p++ = '\0';
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if (IsWindows() || IsXnu()) strntolower(scratch, namelen);
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return &scratch[0];
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}
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/**
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* Resolves full pathname of executable.
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*
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* @return execve()'able path, or NULL w/ errno
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* @errno ENOENT, EACCES, ENOMEM
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* @see free(), execvpe()
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*/
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char *commandv(const char *name, char pathbuf[hasatleast PATH_MAX]) {
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char *p;
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size_t len;
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int rc, olderr;
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olderr = errno;
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if (!(len = strlen(name))) return PROGN(enoent(), NULL);
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if (memchr(name, '=', len)) return PROGN(einval(), NULL);
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if ((IsWindows() &&
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((rc = accesscmd(pathbuf, kNtSystemDirectory, name, len)) != -1 ||
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(rc = accesscmd(pathbuf, kNtWindowsDirectory, name, len)) != -1)) ||
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(rc = accesscmd(pathbuf, "", name, len)) != -1 ||
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(!strpbrk(name, "/\\") &&
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(rc = searchcmdpath(pathbuf, name, len)) != -1)) {
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errno = olderr;
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return pathbuf;
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} else {
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return NULL;
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}
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}
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