libvirt/src/util/stats_linux.c
Stefan Berger 7b7cb1ecc9 deprecate fclose() and introduce VIR_{FORCE_}FCLOSE()
Similarly to deprecating close(), I am now deprecating fclose() and
introduce VIR_FORCE_FCLOSE() and VIR_FCLOSE(). Also, fdopen() is replaced with
VIR_FDOPEN().

Most of the files are opened in read-only mode, so usage of
VIR_FORCE_CLOSE() seemed appropriate. Others that are opened in write
mode already had the fclose()<  0 check and I converted those to
VIR_FCLOSE()<  0.

I did not find occurrences of possible double-closed files on the way.
2010-11-16 21:13:29 -05:00

115 lines
3.2 KiB
C

/*
* Linux block and network stats.
*
* Copyright (C) 2007-2010 Red Hat, Inc.
*
* See COPYING.LIB for the License of this software
*
* Richard W.M. Jones <rjones@redhat.com>
*/
#include <config.h>
/* This file only applies on Linux. */
#ifdef __linux__
# include <stdio.h>
# include <stdlib.h>
# include <fcntl.h>
# include <string.h>
# include <unistd.h>
# include <regex.h>
# include "virterror_internal.h"
# include "datatypes.h"
# include "util.h"
# include "stats_linux.h"
# include "memory.h"
# include "files.h"
# define VIR_FROM_THIS VIR_FROM_STATS_LINUX
# define virStatsError(code, ...) \
virReportErrorHelper(NULL, VIR_FROM_THIS, code, __FILE__, \
__FUNCTION__, __LINE__, __VA_ARGS__)
/*-------------------- interface stats --------------------*/
/* Just reads the named interface, so not Xen or QEMU-specific.
* NB. Caller must check that libvirt user is trying to query
* the interface of a domain they own. We do no such checking.
*/
int
linuxDomainInterfaceStats(const char *path,
struct _virDomainInterfaceStats *stats)
{
int path_len;
FILE *fp;
char line[256], *colon;
fp = fopen ("/proc/net/dev", "r");
if (!fp) {
virReportSystemError(errno, "%s",
_("Could not open /proc/net/dev"));
return -1;
}
path_len = strlen (path);
while (fgets (line, sizeof line, fp)) {
long long dummy;
long long rx_bytes;
long long rx_packets;
long long rx_errs;
long long rx_drop;
long long tx_bytes;
long long tx_packets;
long long tx_errs;
long long tx_drop;
/* The line looks like:
* " eth0:..."
* Split it at the colon.
*/
colon = strchr (line, ':');
if (!colon) continue;
*colon = '\0';
if (colon-path_len >= line &&
STREQ (colon-path_len, path)) {
/* IMPORTANT NOTE!
* /proc/net/dev vif<domid>.nn sees the network from the point
* of view of dom0 / hypervisor. So bytes TRANSMITTED by dom0
* are bytes RECEIVED by the domain. That's why the TX/RX fields
* appear to be swapped here.
*/
if (sscanf (colon+1,
"%lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld",
&tx_bytes, &tx_packets, &tx_errs, &tx_drop,
&dummy, &dummy, &dummy, &dummy,
&rx_bytes, &rx_packets, &rx_errs, &rx_drop,
&dummy, &dummy, &dummy, &dummy) != 16)
continue;
stats->rx_bytes = rx_bytes;
stats->rx_packets = rx_packets;
stats->rx_errs = rx_errs;
stats->rx_drop = rx_drop;
stats->tx_bytes = tx_bytes;
stats->tx_packets = tx_packets;
stats->tx_errs = tx_errs;
stats->tx_drop = tx_drop;
VIR_FORCE_FCLOSE (fp);
return 0;
}
}
VIR_FORCE_FCLOSE(fp);
virStatsError(VIR_ERR_INTERNAL_ERROR,
"/proc/net/dev: Interface not found");
return -1;
}
#endif /* __linux__ */