96 lines
2.1 KiB
C
96 lines
2.1 KiB
C
/*
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* cmd/ifctrstat-linux.c
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* Purpose: Implement ifctrstat system-specific routines for Linux
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*
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* Copyright (c) 2020 Adélie Software in the Public Benefit, Inc.
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* This software is provided 'as is' and without any warranty, express or
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* implied. In no event shall the authors be liable for any damages arising
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* from the use of this software.
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*/
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#include <errno.h>
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#include <limits.h>
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#include <stdio.h>
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#include <string.h>
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#include "multicall.h"
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struct counter_desc {
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const char *name;
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const void *data;
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} avail_counters[] = {
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{"rx.discard", "rx_dropped"},
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{"rx.errors", "rx_errors"},
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{"rx.octets", "rx_bytes"},
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{"rx.packets", "rx_packets"},
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{"tx.discard", "tx_dropped"},
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{"tx.errors", "tx_errors"},
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{"tx.octets", "tx_bytes"},
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{"tx.packets", "tx_packets"}
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};
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size_t avail_counters_count = ARRAY_SIZE(avail_counters);
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static int
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counter_compare(const void *key, const void *candidate)
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{
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return strcasecmp((const char *)key, ((struct counter_desc *)candidate)->name);
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}
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char *
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read_counter(const char *interface, const char *counter)
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{
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FILE *fp;
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const char *path;
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char full_path[PATH_MAX];
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char buffer[1024];
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size_t in_count;
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struct counter_desc *ctrdata;
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errno = 0;
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ctrdata = bsearch(counter, avail_counters, avail_counters_count, sizeof(struct counter_desc), counter_compare);
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if (ctrdata) {
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path = (const char *)ctrdata->data;
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} else {
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errno = ENOSYS;
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return NULL;
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}
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if (snprintf(full_path, PATH_MAX, "/sys/class/net/%s/statistics/%s", interface, path) > PATH_MAX)
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{
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errno = ENOMEM;
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return NULL;
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}
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fp = fopen(full_path, "r");
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if (!fp)
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{
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return NULL;
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}
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in_count = fread(buffer, 1, sizeof(buffer), fp);
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if (in_count == sizeof(buffer))
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{
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errno = ENOMEM;
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fclose(fp);
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return NULL;
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}
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if (ferror(fp))
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{
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return NULL;
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}
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fclose(fp);
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/* take away the \n, we add our own */
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buffer[in_count - 1] = '\0';
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return strdup(buffer);
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}
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