-// $Id: command-exec.c 1957 2005-03-22 15:25:54Z ensc $ --*- c -*--
-
-// Copyright (C) 2004 Enrico Scholz <enrico.scholz@informatik.tu-chemnitz.de>
-//
-// 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
-
-
-#ifdef HAVE_CONFIG_H
-# include <config.h>
-#endif
-
-#include "command.h"
-#include "util.h"
-
-#include <unistd.h>
-#include <fcntl.h>
-#include <errno.h>
-#include <assert.h>
-
-static inline bool
-initPipes(int p[2])
-{
- return (pipe(p)!=-1 &&
- fcntl(p[1], F_SETFD, FD_CLOEXEC)!=-1);
-}
-
-bool
-Command_exec(struct Command *cmd, bool do_fork)
-{
- int p[2];
-
- if (cmd->params_style_==parVEC)
- Vector_zeroEnd(&cmd->params.v);
-
- if (!do_fork)
- cmd->pid = 0;
- else if (!initPipes(p) ||
- (cmd->pid = fork())==-1) {
- cmd->err = errno;
- return false;
- }
-
- if (cmd->pid==0) {
- char const ** argv = { 0 };
-
- if (do_fork) close(p[0]);
-
- switch (cmd->params_style_) {
- case parVEC : argv = cmd->params.v.data; break;
- case parDATA : argv = cmd->params.d; break;
- default : break;
- }
-
- execv(cmd->filename ? cmd->filename : argv[0],
- reinterpret_cast(char **const)(argv));
- cmd->err = errno;
- assert(cmd->err != 0);
-
- if (do_fork) {
- TEMP_FAILURE_RETRY(write(p[1], &cmd->err, sizeof(cmd->err)));
- _exit(1); // implicates 'close(p[1])'
- }
- }
- else {
- close(p[1]);
- if (read(p[0], &cmd->err, sizeof(cmd->err))==0)
- cmd->err = 0;
- else // cleanup zombies
- while (wait4(cmd->pid, 0,0,0)==-1 &&
- (errno==EINTR || errno==EAGAIN)) {};
- close(p[0]);
- }
-
- return cmd->err==0;
-}