--
Shuveb Hussain
Unix is very user friendly. It is just a
little choosy about who its friends are
http://www.binarykarma.com
/*
* utils.c: common, generic utility functions
*
* Copyright (C) 2006, 2007 Red Hat, Inc.
* Copyright (C) 2006 Daniel P. Berrange
* Copyright (C) 2006, 2007 Binary Karma
* Copyright (C) 2006 Shuveb Hussain
*
* 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
*
* Author: Daniel P. Berrange <berrange@xxxxxxxxxx>
* File created Jul 18, 2007 - Shuveb Hussain <shuveb@xxxxxxxxxxxxxxx>
*/
#include <stdio.h>
#include <stdarg.h>
#include <unistd.h>
#include <fcntl.h>
#include <paths.h>
#include <errno.h>
#include <libvirt/virterror.h>
#include "event.h"
#include "buf.h"
#define MAX_ERROR_LEN 1024
static void
ReportError(virConnectPtr conn,
virDomainPtr dom,
virNetworkPtr net,
int code, const char *fmt, ...) {
va_list args;
char errorMessage[MAX_ERROR_LEN];
if (fmt) {
va_start(args, fmt);
vsnprintf(errorMessage, MAX_ERROR_LEN-1, fmt, args);
va_end(args);
} else {
errorMessage[0] = '\0';
}
__virRaiseError(conn, dom, net, VIR_FROM_NONE, code, VIR_ERR_ERROR,
NULL, NULL, NULL, -1, -1, errorMessage);
}
static int virSetCloseExec(int fd) {
int flags;
if ((flags = fcntl(fd, F_GETFD)) < 0)
return -1;
flags |= FD_CLOEXEC;
if ((fcntl(fd, F_SETFD, flags)) < 0)
return -1;
return 0;
}
static int virSetNonBlock(int fd) {
int flags;
if ((flags = fcntl(fd, F_GETFL)) < 0)
return -1;
flags |= O_NONBLOCK;
if ((fcntl(fd, F_SETFL, flags)) < 0)
return -1;
return 0;
}
static int
_virExec(virConnectPtr conn,
char **argv,
int *retpid, int *outfd, int *errfd, int non_block) {
int pid, null;
int pipeout[2] = {-1,-1};
int pipeerr[2] = {-1,-1};
if ((null = open(_PATH_DEVNULL, O_RDONLY)) < 0) {
ReportError(conn, NULL, NULL, VIR_ERR_INTERNAL_ERROR, "cannot open %s : %s",
_PATH_DEVNULL, strerror(errno));
goto cleanup;
}
if ((outfd != NULL && pipe(pipeout) < 0) ||
(errfd != NULL && pipe(pipeerr) < 0)) {
ReportError(conn, NULL, NULL, VIR_ERR_INTERNAL_ERROR, "cannot create pipe : %s",
strerror(errno));
goto cleanup;
}
if ((pid = fork()) < 0) {
ReportError(conn, NULL, NULL, VIR_ERR_INTERNAL_ERROR, "cannot fork child process : %s",
strerror(errno));
goto cleanup;
}
if (pid) { /* parent */
close(null);
if (outfd) {
close(pipeout[1]);
if(non_block)
if(virSetNonBlock(pipeout[0]) == -1)
ReportError(conn, NULL, NULL, VIR_ERR_INTERNAL_ERROR,
"Failed to set non-blocking file descriptor flag");
if(virSetCloseExec(pipeout[0]) == -1)
ReportError(conn, NULL, NULL, VIR_ERR_INTERNAL_ERROR,
"Failed to set close-on-exec file descriptor flag");
*outfd = pipeout[0];
}
if (errfd) {
close(pipeerr[1]);
if(non_block)
if(virSetNonBlock(pipeerr[0]) == -1)
ReportError(conn, NULL, NULL, VIR_ERR_INTERNAL_ERROR,
"Failed to set non-blocking file descriptor flag");
if(virSetCloseExec(pipeerr[0]) == -1)
ReportError(conn, NULL, NULL, VIR_ERR_INTERNAL_ERROR,
"Failed to set close-on-exec file descriptor flag");
*errfd = pipeerr[0];
}
*retpid = pid;
return 0;
}
/* child */
if (pipeout[0] > 0 && close(pipeout[0]) < 0)
_exit(1);
if (pipeerr[0] > 0 && close(pipeerr[0]) < 0)
_exit(1);
if (dup2(null, STDIN_FILENO) < 0)
_exit(1);
if (dup2(pipeout[1] > 0 ? pipeout[1] : null, STDOUT_FILENO) < 0)
_exit(1);
if (dup2(pipeerr[1] > 0 ? pipeerr[1] : null, STDERR_FILENO) < 0)
_exit(1);
close(null);
if (pipeout[1] > 0)
close(pipeout[1]);
if (pipeerr[1] > 0)
close(pipeerr[1]);
execvp(argv[0], argv);
_exit(1);
return 0;
cleanup:
if (pipeerr[0] > 0)
close(pipeerr[0]);
if (pipeerr[1] > 0)
close(pipeerr[1]);
if (pipeout[0] > 0)
close(pipeout[0]);
if (pipeout[1] > 0)
close(pipeout[1]);
if (null > 0)
close(null);
return -1;
}
int
virExec(virConnectPtr conn,
char **argv,
int *retpid, int *outfd, int *errfd) {
_virExec(conn, argv, retpid, outfd, errfd, 0);
}
int
virExecNonBlock(virConnectPtr conn,
char **argv,
int *retpid, int *outfd, int *errfd) {
_virExec(conn, argv, retpid, outfd, errfd, 1);
}
/*
* utils.h: common, generic utility functions
*
* Copyright (C) 2006, 2007 Binary Karma
* Copyright (C) 2006 Shuveb Hussain
*
* 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
*
* File created Jul 18, 2007 - Shuveb Hussain <shuveb@xxxxxxxxxxxxxxx>
*/
int virExec(virConnectPtr conn, char **argv, int *retpid, int *outfd, int *errfd);
int virExecNonBlock(virConnectPtr conn, char **argv, int *retpid, int *outfd, int *errfd);
--
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