text: /*	$NetBSD: lvm-exec.c,v 1.1.1.2 2009/12/02 00:26:43 haad Exp $	*/
  
  /*
   * Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
   * Copyright (C) 2004-2009 Red Hat, Inc. All rights reserved.
   *
   * This file is part of LVM2.
   *
   * This copyrighted material is made available to anyone wishing to use,
   * modify, copy, or redistribute it subject to the terms and conditions
   * of the GNU Lesser General Public License v.2.1.
   *
   * You should have received a copy of the GNU Lesser 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
   */
  
  #include "lib.h"
  #include "device.h"
  #include "locking.h"
  #include "lvm-exec.h"
  #include "toolcontext.h"
  
  #include <unistd.h>
  #include <sys/wait.h>
  
  /*
   * Create verbose string with list of parameters
   */
  static char *_verbose_args(const char *const argv[], char *buf, size_t sz)
  {
  	int pos = 0;
  	int len;
  	unsigned i;
  
  	buf[0] = '\0';
  	for (i = 0; argv[i]; i++) {
  		if ((len = dm_snprintf(buf + pos, sz - pos,
  				       "%s ", argv[i])) < 0)
  			/* Truncated */
  			break;
  		pos += len;
  	}
  
  	return buf;
  }
  
  /*
   * Execute and wait for external command
   */
  int exec_cmd(struct cmd_context *cmd, const char *const argv[])
  {
  	pid_t pid;
  	int status;
  	char buf[PATH_MAX * 2];
  
  	log_verbose("Executing: %s", _verbose_args(argv, buf, sizeof(buf)));
  
  	if ((pid = fork()) == -1) {
  		log_error("fork failed: %s", strerror(errno));
  		return 0;
  	}
  
  	if (!pid) {
  		/* Child */
  		reset_locking();
  		dev_close_all();
  		/* FIXME Fix effect of reset_locking on cache then include this */
  		/* destroy_toolcontext(cmd); */
  		/* FIXME Use execve directly */
  		execvp(argv[0], (char **const) argv);
  		log_sys_error("execvp", argv[0]);
  		_exit(errno);
  	}
  
  	/* Parent */
  	if (wait4(pid, &status, 0, NULL) != pid) {
  		log_error("wait4 child process %u failed: %s", pid,
  			  strerror(errno));
  		return 0;
  	}
  
  	if (!WIFEXITED(status)) {
  		log_error("Child %u exited abnormally", pid);
  		return 0;
  	}
  
  	if (WEXITSTATUS(status)) {
  		log_error("%s failed: %u", argv[0], WEXITSTATUS(status));
  		return 0;
  	}
  
  	return 1;
  }
  