1 /*****************************************************************************
2 * RRDtool 1.1.x Copyright Tobias Oetiker, 1997 - 2002
3 *****************************************************************************
4 * rrd_open.c Open an RRD File
5 *****************************************************************************
8 * Revision 1.6 2003/02/13 07:05:27 oetiker
9 * Find attached the patch I promised to send to you. Please note that there
10 * are three new source files (src/rrd_is_thread_safe.h, src/rrd_thread_safe.c
11 * and src/rrd_not_thread_safe.c) and the introduction of librrd_th. This
12 * library is identical to librrd, but it contains support code for per-thread
13 * global variables currently used for error information only. This is similar
14 * to how errno per-thread variables are implemented. librrd_th must be linked
15 * alongside of libpthred
17 * There is also a new file "THREADS", holding some documentation.
19 * -- Peter Stamfest <peter@stamfest.at>
21 * Revision 1.5 2002/06/20 00:21:03 jake
22 * More Win32 build changes; thanks to Kerry Calvert.
24 * Revision 1.4 2002/02/01 20:34:49 oetiker
25 * fixed version number and date/time
27 * Revision 1.3 2001/03/04 13:01:55 oetiker
28 * Aberrant Behavior Detection support. A brief overview added to rrdtool.pod.
29 * Major updates to rrd_update.c, rrd_create.c. Minor update to other core files.
30 * This is backwards compatible! But new files using the Aberrant stuff are not readable
31 * by old rrdtool versions. See http://cricket.sourceforge.net/aberrant/rrd_hw.htm
32 * -- Jake Brutlag <jakeb@corp.webtv.net>
34 * Revision 1.2 2001/03/04 10:29:20 oetiker
35 * fixed filedescriptor leak
36 * -- Mike Franusich <mike@franusich.com>
38 * Revision 1.1.1.1 2001/02/25 22:25:05 oetiker
41 *****************************************************************************/
46 /* open a database file, return its header and a open filehandle */
47 /* positioned to the first cdp in the first rra */
50 rrd_open(char *file_name, FILE **in_file, rrd_t *rrd, int rdwr)
56 if (rdwr == RRD_READONLY) {
70 if (((*in_file) = fopen(file_name,mode)) == NULL ){
71 rrd_set_error("opening '%s': %s",file_name, rrd_strerror(errno));
75 if (rdwr == RRD_READWRITE)
77 if (setvbuf((*in_file),NULL,_IONBF,2)) {
78 rrd_set_error("failed to disable the stream buffer\n");
84 #define MYFREAD(MYVAR,MYVART,MYCNT) \
85 if ((MYVAR = malloc(sizeof(MYVART) * MYCNT)) == NULL) {\
86 rrd_set_error("" #MYVAR " malloc"); \
89 fread(MYVAR,sizeof(MYVART),MYCNT, *in_file);
92 MYFREAD(rrd->stat_head, stat_head_t, 1)
94 /* lets do some test if we are on track ... */
95 if (strncmp(rrd->stat_head->cookie,RRD_COOKIE,4) != 0){
96 rrd_set_error("'%s' is not an RRD file",file_name);
101 if (atoi(rrd->stat_head->version) > atoi(RRD_VERSION)){
102 rrd_set_error("can't handle RRD file version %s",
103 rrd->stat_head->version);
104 free(rrd->stat_head);
108 if (rrd->stat_head->float_cookie != FLOAT_COOKIE){
109 rrd_set_error("This RRD was created on other architecture");
110 free(rrd->stat_head);
114 MYFREAD(rrd->ds_def, ds_def_t, rrd->stat_head->ds_cnt)
115 MYFREAD(rrd->rra_def, rra_def_t, rrd->stat_head->rra_cnt)
116 MYFREAD(rrd->live_head, live_head_t, 1)
117 MYFREAD(rrd->pdp_prep, pdp_prep_t, rrd->stat_head->ds_cnt)
118 MYFREAD(rrd->cdp_prep, cdp_prep_t, (rrd->stat_head->rra_cnt
119 * rrd->stat_head->ds_cnt))
120 MYFREAD(rrd->rra_ptr, rra_ptr_t, rrd->stat_head->rra_cnt)
126 void rrd_init(rrd_t *rrd)
128 rrd->stat_head = NULL;
131 rrd->live_head = NULL;
133 rrd->pdp_prep = NULL;
134 rrd->cdp_prep = NULL;
135 rrd->rrd_value = NULL;
138 void rrd_free(rrd_t *rrd)
140 if (rrd->stat_head) free(rrd->stat_head);
141 if (rrd->ds_def) free(rrd->ds_def);
142 if (rrd->rra_def) free(rrd->rra_def);
143 if (rrd->live_head) free(rrd->live_head);
144 if (rrd->rra_ptr) free(rrd->rra_ptr);
145 if (rrd->pdp_prep) free(rrd->pdp_prep);
146 if (rrd->cdp_prep) free(rrd->cdp_prep);
147 if (rrd->rrd_value) free(rrd->rrd_value);
150 /* routine used by external libraries to free memory allocated by
152 void rrd_freemem(void *mem)
158 int readfile(char *file_name, char **buffer, int skipfirst){
159 long writecnt=0,totalcnt = MEMBLK;
162 if ((strcmp("-",file_name) == 0)) { input = stdin; }
164 if ((input = fopen(file_name,"rb")) == NULL ){
165 rrd_set_error("opening '%s': %s",file_name,rrd_strerror(errno));
170 do { c = getc(input); } while (c != '\n' && ! feof(input));
172 if (((*buffer) = (char *) malloc((MEMBLK+4)*sizeof(char))) == NULL) {
173 perror("Allocate Buffer:");
177 writecnt += fread((*buffer)+writecnt, 1, MEMBLK * sizeof(char) ,input);
178 if (writecnt >= totalcnt){
180 if (((*buffer)=rrd_realloc((*buffer), (totalcnt+4) * sizeof(char)))==NULL){
181 perror("Realloc Buffer:");
185 } while (! feof(input));
186 (*buffer)[writecnt] = '\0';
187 if (strcmp("-",file_name) != 0) {fclose(input);};