/* $Id: plugin_uptime.c,v 1.4 2004/06/26 12:05:00 reinelt Exp $ * * plugin for uptime * * Copyright 2003 Michael Reinelt * Copyright 2004 The LCD4Linux Team * * 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. * * * $Log: plugin_uptime.c,v $ * Revision 1.4 2004/06/26 12:05:00 reinelt * * uh-oh... the last CVS log message messed up things a lot... * * Revision 1.3 2004/06/26 09:27:21 reinelt * * added '-W' to CFLAGS * changed all C++ comments to C ones * cleaned up a lot of signed/unsigned mistakes * * Revision 1.2 2004/06/20 10:09:56 reinelt * * 'const'ified the whole source * * Revision 1.1 2004/05/22 18:30:02 reinelt * * added plugin 'uptime' * */ /* * exported functions: * * int plugin_init_uptime (void) * adds functions for uptime * */ #include "config.h" #include #include #include #include #include #include #include #include #include #include "debug.h" #include "plugin.h" static int fd = -2; static char *itoa(char* buffer, const size_t size, unsigned int value) { char *p; /* sanity checks */ if (buffer==NULL || size<2) return (NULL); /* p points to last char */ p = buffer+size-1; /* set terminating zero */ *p='\0'; do { *--p = value%10 + '0'; value = value/10; } while (value!=0 && p>buffer); return p; } char *struptime (const unsigned int uptime, const char *format) { static char string[256]; const char *src; char *dst; int len, size; src = format; dst = string; len = 0; /* leave room for terminating zero */ size = sizeof(string) - 1; while (len < size) { if (*src == '%') { src++; if (strchr ("sSmMhHd", *src) != NULL) { char buffer[12], *s; unsigned int value = 0; int leading_zero = 0; switch (*src++) { case 's': value = uptime; break; case 'S': value = uptime % 60; leading_zero = 1; break; case 'm': value = uptime / 60; break; case 'M': value = (uptime / 60) % 60; leading_zero = 1; break; case 'h': value = uptime / 60 / 60; break; case 'H': value = (uptime / 60 / 60) % 24; leading_zero = 1; break; case 'd': value = uptime / 60 / 60 / 24; break; } if (leading_zero && value < 10) { len++; *dst++ = '0'; } s = itoa (buffer, sizeof(buffer), value); while (len < size && *s != '\0') { len++; *dst++ = *s++; } } else if (*src == '%') { len++; *dst++ = '%'; } else { len += 2; *dst++ = '%'; *dst++ = *src++; } } else { len++; *dst++ = *src; if (*src++ == '\0') break; } } /* enforce terminating zero */ if (len >= size && *(dst-1) != '\0') { len++; *dst = '\0'; } return string; } double getuptime (void) { char buffer[36]; int i; if (fd == -2) fd = open ("/proc/uptime", O_RDONLY); if (fd < 0) return -1; lseek(fd, 0, SEEK_SET); i = read (fd, buffer, sizeof(buffer) - 1); if (i < 0) return -1; buffer[i-1] = '\0'; /* ignore the 2nd value from /proc/uptime */ return strtod(buffer, NULL); } static void my_uptime (RESULT *result, const int argc, RESULT *argv[]) { int age; static double uptime = 0.0; static struct timeval last_value; struct timeval now; if (argc>1) { error ("uptime(): wrong number of parameters"); SetResult(&result, R_STRING, ""); return; } gettimeofday(&now,NULL); age = (now.tv_sec - last_value.tv_sec)*1000 + (now.tv_usec - last_value.tv_usec)/1000; /* reread every 100 msec only */ if (fd == -2 || age == 0 || age > 100) { uptime = getuptime(); if (uptime < 0.0) { error ("parse(/proc/uptime) failed!"); SetResult(&result, R_STRING, ""); return; } last_value = now; } if (argc == 0) { SetResult (&result, R_NUMBER, &uptime); } else { SetResult (&result, R_STRING, struptime(uptime, R2S(argv[0]))); } return; } int plugin_init_uptime (void) { AddFunction ("uptime", -1, my_uptime); return 0; } void plugin_exit_uptime(void) { if (fd > 0) close(fd); fd = -2; } 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139