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/*
* Generic Monitor plugin for the Xfce4 panel
* Spawn - Spawn a process and capture its output
* Copyright (c) 2004 Roger Seguin <roger_seguin@msn.com>
* <http://rmlx.dyndns.org>
* Copyright (c) 2006 Julien Devemy <jujucece@gmail.com>
* Copyright (c) 2012 John Lindgren <john.lindgren@aol.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
* This library 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
* Lesser General Public License for more details.
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/* Posix-compliance to make sure that only the calling thread is
duplicated, not the whole process (e.g Solaris) */
#ifndef _POSIX_C_SOURCE
#define _POSIX_C_SOURCE 199506L
#endif
#ifndef _XOPEN_SOURCE
#define _XOPEN_SOURCE 500
#endif
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "cmdspawn.h"
#include <stdlib.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <memory.h>
#include <strings.h>
#include <string.h>
#include <poll.h>
#include <stdarg.h>
#include <errno.h>
#include <sys/wait.h>
#include <libxfce4ui/libxfce4ui.h>
/**********************************************************************/
char *genmon_Spawn (char **argv, int wait)
/**********************************************************************/
/* Spawn a command and capture its output from stdout or stderr */
/* Return allocated string on success, otherwise NULL */
{
enum { OUT, ERR, OUT_ERR };
enum { RD, WR, RD_WR };
int aaiPipe[OUT_ERR][RD_WR];
pid_t pid;
struct pollfd aoPoll[OUT_ERR];
int status;
int i, j, k;
char *str = NULL;
if (!(*argv))
{
fprintf (stderr, "Spawn() error: No parameters passed!\n");
return (NULL);
}
for (i = 0; i < OUT_ERR; i++)
pipe (aaiPipe[i]);
switch (pid = fork ())
{
case -1:
perror ("fork()");
for (i = 0; i < OUT_ERR; i++)
for (j = 0; j < RD_WR; j++)
close (aaiPipe[i][j]);
return (NULL);
case 0:
/* Redirect stdout/stderr to associated pipe's write-ends */
for (i = 0; i < OUT_ERR; i++)
{
j = i + 1; // stdout/stderr file descriptor
k = dup2 (aaiPipe[i][WR], j);
if (k != j)
{
perror ("dup2()");
exit (-1);
}
}
/* Execute the given command */
execvp (argv[0], argv);
perror (argv[0]);
exit (-1);
}
for (i = 0; i < OUT_ERR; i++)
close (aaiPipe[i][WR]); /* close write end of pipes in parent */
/* Wait for child completion */
if (wait == 1)
{
status = waitpid (pid, 0, 0);
if (status == -1)
{
perror ("waitpid()");
goto End;
}
/* Read stdout/stderr pipes' read-ends */
for (i = 0; i < OUT_ERR; i++)
{
aoPoll[i].fd = aaiPipe[i][RD];
aoPoll[i].events = POLLIN;
aoPoll[i].revents = 0;
}
poll (aoPoll, OUT_ERR, ~0);
for (i = 0; i < OUT_ERR; i++)
if (aoPoll[i].revents & POLLIN)
break;
if (i == OUT_ERR)
goto End;
j = 0;
while (1)
{
str = g_realloc (str, j + 256);
if ((k = read (aaiPipe[i][RD], str + j, 255)) > 0)
j += k;
else
break;
}
str[j] = 0;
/* Remove trailing carriage return if any */
i = strlen (str) - 1;
if (i >= 0 && str[i] == '\n')
str[i] = 0;
}
End:
/* Close read end of pipes */
for (i = 0; i < OUT_ERR; i++)
close (aaiPipe[i][RD]);
return (str);
}// Spawn()
/**********************************************************************/
char *genmon_SpawnCmd (const char *p_pcCmdLine, int wait)
/**********************************************************************/
/* Parse a command line, spawn the command, and capture its output from stdout or stderr */
/* Return allocated string on success, otherwise NULL */
{
char **argv;
int argc;
GError *error = NULL;
char *str;
/* Split the commandline into an argv array */
if (!g_shell_parse_argv (p_pcCmdLine, &argc, &argv, &error)) {
char *first = g_strdup_printf (_("Error in command \"%s\""), p_pcCmdLine);
xfce_message_dialog (NULL, _("Xfce Panel"),
"dialog-error", first, error->message,
"gtk-close", GTK_RESPONSE_OK, NULL);
g_error_free (error);
g_free (first);
return (NULL);
}
/* Spawn the command and free allocated memory */
str = genmon_Spawn (argv, wait);
g_strfreev (argv);
return (str);
}// SpawnCmd()
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