diff options
Diffstat (limited to 'plugin_netdev.c')
| -rw-r--r-- | plugin_netdev.c | 190 |
1 files changed, 190 insertions, 0 deletions
diff --git a/plugin_netdev.c b/plugin_netdev.c new file mode 100644 index 0000000..2f7e13c --- /dev/null +++ b/plugin_netdev.c @@ -0,0 +1,190 @@ +/* $Id: plugin_netdev.c 840 2007-09-09 12:17:42Z michael $ + * $URL: https://ssl.bulix.org/svn/lcd4linux/trunk/plugin_netdev.c $ + * + * plugin for /proc/net/dev parsing + * + * Copyright (C) 2003 Michael Reinelt <michael@reinelt.co.at> + * Copyright (C) 2004 The LCD4Linux Team <lcd4linux-devel@users.sourceforge.net> + * + * This file is part of LCD4Linux. + * + * LCD4Linux is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2, or (at your option) + * any later version. + * + * LCD4Linux 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 General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + * + */ + +/* + * exported functions: + * + * int plugin_init_netdev (void) + * adds functions to access /proc/net/dev + * + */ + + +#include "config.h" + +#include <stdlib.h> +#include <stdio.h> +#include <string.h> +#include <ctype.h> +#include <errno.h> + +#include "debug.h" +#include "plugin.h" +#include "qprintf.h" +#include "hash.h" + + +static HASH NetDev; +static FILE *Stream = NULL; +static char *DELIMITER = " :|\t\n"; + +static int parse_netdev(void) +{ + int age; + int row, col; + static int first_time = 1; + + /* reread every 10 msec only */ + age = hash_age(&NetDev, NULL); + if (age > 0 && age <= 10) + return 0; + + if (Stream == NULL) + Stream = fopen("/proc/net/dev", "r"); + if (Stream == NULL) { + error("fopen(/proc/net/dev) failed: %s", strerror(errno)); + return -1; + } + + rewind(Stream); + row = 0; + + while (!feof(Stream)) { + char buffer[256]; + char dev[16]; + char *beg, *end; + unsigned int len; + + if (fgets(buffer, sizeof(buffer), Stream) == NULL) + break; + + switch (++row) { + + case 1: + /* skip row 1 */ + continue; + + case 2: + /* row 2 used for headers */ + if (first_time) { + char *RxTx = strrchr(buffer, '|'); + first_time = 0; + col = 0; + beg = buffer; + while (beg) { + char key[32]; + + while (strchr(DELIMITER, *beg)) + beg++; + if ((end = strpbrk(beg, DELIMITER)) != NULL) + *end = '\0'; + qprintf(key, sizeof(key), "%s_%s", beg < RxTx ? "Rx" : "Tx", beg); + hash_set_column(&NetDev, col++, key); + beg = end ? end + 1 : NULL; + } + } + continue; + + default: + /* fetch interface name (1st column) as key */ + beg = buffer; + while (*beg && *beg == ' ') + beg++; + end = beg + 1; + while (*end && *end != ':') + end++; + len = end - beg; + if (len >= sizeof(dev)) + len = sizeof(dev) - 1; + strncpy(dev, beg, len); + dev[len] = '\0'; + + hash_put_delta(&NetDev, dev, buffer); + } + } + + return 0; +} + +static void my_netdev(RESULT * result, RESULT * arg1, RESULT * arg2, RESULT * arg3) +{ + char *dev, *key; + int delay; + double value; + + if (parse_netdev() < 0) { + SetResult(&result, R_STRING, ""); + return; + } + + dev = R2S(arg1); + key = R2S(arg2); + delay = R2N(arg3); + + value = hash_get_regex(&NetDev, dev, key, delay); + + SetResult(&result, R_NUMBER, &value); +} + +static void my_netdev_fast(RESULT * result, RESULT * arg1, RESULT * arg2, RESULT * arg3) +{ + char *dev, *key; + int delay; + double value; + + if (parse_netdev() < 0) { + SetResult(&result, R_STRING, ""); + return; + } + + dev = R2S(arg1); + key = R2S(arg2); + delay = R2N(arg3); + + value = hash_get_delta(&NetDev, dev, key, delay); + + SetResult(&result, R_NUMBER, &value); +} + + +int plugin_init_netdev(void) +{ + hash_create(&NetDev); + hash_set_delimiter(&NetDev, " :|\t\n"); + + AddFunction("netdev", 3, my_netdev); + AddFunction("netdev::fast", 3, my_netdev_fast); + return 0; +} + +void plugin_exit_netdev(void) +{ + if (Stream != NULL) { + fclose(Stream); + Stream = NULL; + } + hash_destroy(&NetDev); +} |