This is a maintenance fork
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/*-*- 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 2020 Justine Alexandra Roberts Tunney │
│ │
│ This program is free software; you can redistribute it and/or modify │
│ it under the terms of the GNU General Public License as published by │
│ the Free Software Foundation; version 2 of the License. │
│ │
│ This program is distributed in the hope that it will be useful, but │
│ WITHOUT ANY WARRANTY; without even the implied warranty of │
│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
│ General Public License for more details. │
│ │
│ You should have received a copy of the GNU General Public License │
│ along with this program; if not, write to the Free Software │
│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
│ 02110-1301 USA │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/assert.h"
#include "libc/calls/calls.h"
#include "libc/calls/hefty/internal.h"
#include "libc/calls/hefty/spawn.h"
#include "libc/calls/internal.h"
#include "libc/conv/conv.h"
#include "libc/dce.h"
#include "libc/mem/mem.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/fileno.h"
#include "libc/sysv/consts/o.h"
int spawnve$sysv(unsigned flags, int stdiofds[3], const char *program,
char *const argv[], char *const envp[]) {
int rc, pid, fd;
size_t i, j, len;
int32_t tubes[3][2];
char **argv2, MZqFpD[8];
void *argv3;
pid = 0;
argv2 = NULL;
argv3 = argv;
/*
* αcτµαlly pδrταblε εxεcµταblε w/ thompson shell script
* morphology needs to be launched via command interpreter.
*/
if (endswith(program, ".com") || endswith(program, ".exe")) {
memset(MZqFpD, 0, sizeof(MZqFpD));
fd = openat$sysv(AT_FDCWD, program, O_RDONLY, 0);
read$sysv(fd, MZqFpD, sizeof(MZqFpD));
close$sysv(fd);
if (memcmp(MZqFpD, "MZqFpD", 6) == 0) {
/*
* If we got this:
*
* spawn(/bin/echo, [echo, hi, there])
*
* It will become this:
*
* spawn(/bin/sh, [sh, /bin/echo, hi, there])
*/
len = 1;
while (argv[len]) len++;
if ((argv2 = malloc((2 + len + 1) * sizeof(char *)))) {
i = 0, j = 1;
argv2[i++] = "sh";
argv2[i++] = program;
while (j < len) argv2[i++] = argv[j++];
argv2[i] = NULL;
argv3 = argv2;
program = "/bin/sh";
}
}
}
for (i = 0; i < 3; ++i) {
if (stdiofds[i] == -1) {
pid |= pipe$sysv(tubes[i]);
}
}
if (pid != -1) {
if ((pid = vfork()) == 0) {
if (flags & SPAWN_DETACH) {
if (setsid() == -1) abort();
if ((rc = fork$sysv()) == -1) abort();
if (rc > 0) _exit(0);
}
for (i = 0; i < 3; ++i) {
if (stdiofds[i] == -1) {
close$sysv(tubes[i][kIoMotion[i]]);
fd = tubes[i][!kIoMotion[i]];
} else {
fd = stdiofds[i];
}
dup2$sysv(fd, i);
}
execve$sysv(program, argv3, envp);
abort();
}
}
for (i = 0; i < 3; ++i) {
if (stdiofds[i] == -1) {
close$sysv(tubes[i][!kIoMotion[i]]);
fd = tubes[i][kIoMotion[i]];
if (pid != -1) {
stdiofds[i] = fd;
} else {
close$sysv(fd);
}
}
}
if (argv2) free(argv2);
return pid;
}