cosmopolitan/libc/calls/hefty/spawnve.c

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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/bits/pushpop.h"
#include "libc/calls/hefty/internal.h"
#include "libc/calls/hefty/spawn.h"
#include "libc/dce.h"
#include "libc/sysv/consts/fileno.h"
#include "libc/sysv/errfuns.h"
/**
* Launches program, e.g.
*
* char buf[2];
* int ws, pid, fds[3] = {-1, -1, STDERR_FILENO};
* CHECK_NE(-1, (pid = spawnve(0, fds, commandv("ssh"),
* (char *const[]){"ssh", hostname, "cat", NULL},
* environ)));
* CHECK_EQ(+2, write(fds[0], "hi", 2));
* CHECK_NE(-1, close(fds[0]));
* CHECK_EQ(+2, read(fds[1], buf, 2)));
* CHECK_NE(-1, close(fds[1]));
* CHECK_EQ(+0, memcmp(buf, "hi", 2)));
* CHECK_NE(-1, waitpid(pid, &ws, 0));
* CHECK_EQ(+0, WEXITSTATUS(ws));
*
* @param stdiofds may optionally be passed to customize standard i/o
* @param stdiofds[𝑖] may be -1 to receive a pipe() fd
* @param program will not be PATH searched, see commandv()
* @param argv[0] is the name of the program to run
* @param argv[1,n-2] optionally specify program arguments
* @param argv[n-1] is NULL
* @param envp[0,n-2] specifies "foo=bar" environment variables
* @param envp[n-1] is NULL
* @return pid of child, or -1 w/ errno
*/
int spawnve(unsigned flags, int stdiofds[3], const char *program,
char *const argv[], char *const envp[]) {
if (!argv[0]) return einval();
int defaultfds[3] = {pushpop(STDIN_FILENO), pushpop(STDOUT_FILENO),
pushpop(STDERR_FILENO)};
if (!IsWindows()) {
return spawnve$sysv(flags, stdiofds ?: defaultfds, program, argv, envp);
} else {
return spawnve$nt(flags, stdiofds ?: defaultfds, program, argv, envp);
}
}