00001 /* 00002 * Copyright (C) 1999-2003 Paolo Mantegazza <mantegazza@aero.polimi.it> 00003 * 00004 * This program is free software; you can redistribute it and/or 00005 * modify it under the terms of the GNU General Public License as 00006 * published by the Free Software Foundation; either version 2 of the 00007 * License, or (at your option) any later version. 00008 * 00009 * This program is distributed in the hope that it will be useful, 00010 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00011 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00012 * GNU General Public License for more details. 00013 * 00014 * You should have received a copy of the GNU General Public License 00015 * along with this program; if not, write to the Free Software 00016 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 00017 */ 00018 00019 #ifndef _RTAI_PROC_FS_H 00020 #define _RTAI_PROC_FS_H 00021 00022 #define LIMIT (PAGE_SIZE - 80) 00023 00024 extern struct proc_dir_entry *rtai_proc_root; 00025 00026 // proc print macros - Contributed by: Erwin Rol (erwin@muffin.org) 00027 00028 // macro that holds the local variables that 00029 // we use in the PROC_PRINT_* macros. We have 00030 // this macro so we can add variables with out 00031 // changing the users of this macro, of course 00032 // only when the names don't colide! 00033 #define PROC_PRINT_VARS \ 00034 off_t pos = 0; \ 00035 off_t begin = 0; \ 00036 int len = 0 /* no ";" */ 00037 00038 // macro that prints in the procfs read buffer. 00039 // this macro expects the function arguments to be 00040 // named as follows. 00041 // static int FOO(char *page, char **start, 00042 // off_t off, int count, int *eof, void *data) 00043 00044 #define PROC_PRINT(fmt,args...) \ 00045 do { \ 00046 len += sprintf(page + len , fmt, ##args); \ 00047 pos += len; \ 00048 if(pos < off) { \ 00049 len = 0; \ 00050 begin = pos; \ 00051 } \ 00052 if(pos > off + count) \ 00053 goto done; \ 00054 } while(0) 00055 00056 // macro to leave the read function for a other 00057 // place than at the end. 00058 #define PROC_PRINT_RETURN \ 00059 do { \ 00060 *eof = 1; \ 00061 goto done; \ 00062 } while(0) 00063 00064 // macro that should only used ones at the end of the 00065 // read function, to return from a other place in the 00066 // read function use the PROC_PRINT_RETURN macro. 00067 #define PROC_PRINT_DONE \ 00068 do { \ 00069 *eof = 1; \ 00070 done: \ 00071 *start = page + (off - begin); \ 00072 len -= (off - begin); \ 00073 if(len > count) \ 00074 len = count; \ 00075 if(len < 0) \ 00076 len = 0; \ 00077 return len; \ 00078 } while(0) 00079 00080 // End of proc print macros 00081 00082 #endif /* !_RTAI_PROC_FS_H */
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