1 // $Id: command-exec.c,v 1.3 2005/03/22 15:25:54 ensc Exp $ --*- c -*--
3 // Copyright (C) 2004 Enrico Scholz <enrico.scholz@informatik.tu-chemnitz.de>
5 // This program is free software; you can redistribute it and/or modify
6 // it under the terms of the GNU General Public License as published by
7 // the Free Software Foundation; version 2 of the License.
9 // This program is distributed in the hope that it will be useful,
10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 // GNU General Public License for more details.
14 // You should have received a copy of the GNU General Public License
15 // along with this program; if not, write to the Free Software
16 // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
34 return (pipe(p)!=-1 &&
35 fcntl(p[1], F_SETFD, FD_CLOEXEC)!=-1);
39 Command_exec(struct Command *cmd, bool do_fork)
43 if (cmd->params_style_==parVEC)
44 Vector_zeroEnd(&cmd->params.v);
48 else if (!initPipes(p) ||
49 (cmd->pid = fork())==-1) {
55 char const ** argv = { 0 };
57 if (do_fork) close(p[0]);
59 switch (cmd->params_style_) {
60 case parVEC : argv = cmd->params.v.data; break;
61 case parDATA : argv = cmd->params.d; break;
65 execv(cmd->filename ? cmd->filename : argv[0],
66 reinterpret_cast(char **const)(argv));
68 assert(cmd->err != 0);
71 TEMP_FAILURE_RETRY(write(p[1], &cmd->err, sizeof(cmd->err)));
72 _exit(1); // implicates 'close(p[1])'
77 if (read(p[0], &cmd->err, sizeof(cmd->err))==0)
79 else // cleanup zombies
80 while (wait4(cmd->pid, 0,0,0)==-1 &&
81 (errno==EINTR || errno==EAGAIN)) {};