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Justine Tunney 2020-06-15 07:18:57 -07:00
commit c91b3c5006
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libc/calls/hefty/spawnlp.c Normal file
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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/calls/calls.h"
#include "libc/calls/hefty/mkvarargv.h"
#include "libc/calls/hefty/spawn.h"
#include "libc/mem/mem.h"
#include "libc/runtime/runtime.h"
/**
* Launches program, with PATH search and current environment.
*
* @param stdiofds may optionally be passed to customize standard i/o
* @param stdiofds[𝑖] may be -1 to receive a pipe() fd
* @param prog is program to launch (may be PATH searched)
* @param arg[0] is the name of the program to run
* @param arg[1,n-2] optionally specify program arguments
* @param arg[n-1] is NULL
* @return pid of child, or -1 w/ errno
*/
nodiscard int spawnlp(unsigned flags, int stdiofds[3], const char *prog,
const char *arg, ... /*, NULL*/) {
int pid;
char *exe;
va_list va;
void *argv;
pid = -1;
if ((exe = commandv(prog))) {
va_start(va, arg);
if ((argv = mkvarargv(arg, va))) {
pid = spawnve(flags, stdiofds, exe, argv, environ);
free(argv);
}
va_end(va);
}
return pid;
}