1 /*****************************************************************************
2 * RRDtool 1.1.x Copyright Tobias Oetiker, 1997 - 2002
3 *****************************************************************************
4 * rrd_open.c Open an RRD File
5 *****************************************************************************
8 * Revision 1.9 2003/04/29 21:56:49 oetiker
9 * readline in rrd_open.c reads the file in 8 KB blocks, and calls realloc for
10 * each block. realloc is very slow in Mac OS X for huge blocks, e.g. when
11 * restoring databases from huge xml files. This patch finds the size of the
12 * file, and starts out with malloc'ing the full size.
13 * -- Peter Speck <speck@ruc.dk>
15 * Revision 1.8 2003/04/11 19:43:44 oetiker
16 * New special value COUNT which allows calculations based on the position of a
17 * value within a data set. Bug fix in rrd_rpncalc.c. PREV returned erroneus
18 * value for the second value. Bug fix in rrd_restore.c. Bug causing seek error
19 * when accesing an RRD restored from an xml that holds an RRD version <3.
20 * -- Ruben Justo <ruben@ainek.com>
22 * Revision 1.7 2003/03/31 21:22:12 oetiker
23 * enables RRDtool updates with microsecond or in case of windows millisecond
24 * precision. This is needed to reduce time measurement error when archive step
25 * is small. (<30s) -- Sasha Mikheev <sasha@avalon-net.co.il>
27 * Revision 1.6 2003/02/13 07:05:27 oetiker
28 * Find attached the patch I promised to send to you. Please note that there
29 * are three new source files (src/rrd_is_thread_safe.h, src/rrd_thread_safe.c
30 * and src/rrd_not_thread_safe.c) and the introduction of librrd_th. This
31 * library is identical to librrd, but it contains support code for per-thread
32 * global variables currently used for error information only. This is similar
33 * to how errno per-thread variables are implemented. librrd_th must be linked
34 * alongside of libpthred
36 * There is also a new file "THREADS", holding some documentation.
38 * -- Peter Stamfest <peter@stamfest.at>
40 * Revision 1.5 2002/06/20 00:21:03 jake
41 * More Win32 build changes; thanks to Kerry Calvert.
43 * Revision 1.4 2002/02/01 20:34:49 oetiker
44 * fixed version number and date/time
46 * Revision 1.3 2001/03/04 13:01:55 oetiker
47 * Aberrant Behavior Detection support. A brief overview added to rrdtool.pod.
48 * Major updates to rrd_update.c, rrd_create.c. Minor update to other core files.
49 * This is backwards compatible! But new files using the Aberrant stuff are not readable
50 * by old rrdtool versions. See http://cricket.sourceforge.net/aberrant/rrd_hw.htm
51 * -- Jake Brutlag <jakeb@corp.webtv.net>
53 * Revision 1.2 2001/03/04 10:29:20 oetiker
54 * fixed filedescriptor leak
55 * -- Mike Franusich <mike@franusich.com>
57 * Revision 1.1.1.1 2001/02/25 22:25:05 oetiker
60 *****************************************************************************/
65 /* open a database file, return its header and a open filehandle */
66 /* positioned to the first cdp in the first rra */
69 rrd_open(char *file_name, FILE **in_file, rrd_t *rrd, int rdwr)
77 if (rdwr == RRD_READONLY) {
91 if (((*in_file) = fopen(file_name,mode)) == NULL ){
92 rrd_set_error("opening '%s': %s",file_name, rrd_strerror(errno));
96 if (rdwr == RRD_READWRITE)
98 if (setvbuf((*in_file),NULL,_IONBF,2)) {
99 rrd_set_error("failed to disable the stream buffer\n");
105 #define MYFREAD(MYVAR,MYVART,MYCNT) \
106 if ((MYVAR = malloc(sizeof(MYVART) * MYCNT)) == NULL) {\
107 rrd_set_error("" #MYVAR " malloc"); \
110 fread(MYVAR,sizeof(MYVART),MYCNT, *in_file);
113 MYFREAD(rrd->stat_head, stat_head_t, 1)
114 version = atoi(rrd->stat_head->version);
116 /* lets do some test if we are on track ... */
117 if (strncmp(rrd->stat_head->cookie,RRD_COOKIE,4) != 0){
118 rrd_set_error("'%s' is not an RRD file",file_name);
119 free(rrd->stat_head);
123 if (version > atoi(RRD_VERSION)){
124 rrd_set_error("can't handle RRD file version %s",
125 rrd->stat_head->version);
126 free(rrd->stat_head);
130 if (rrd->stat_head->float_cookie != FLOAT_COOKIE){
131 rrd_set_error("This RRD was created on other architecture");
132 free(rrd->stat_head);
136 MYFREAD(rrd->ds_def, ds_def_t, rrd->stat_head->ds_cnt)
137 MYFREAD(rrd->rra_def, rra_def_t, rrd->stat_head->rra_cnt)
138 /* handle different format for the live_head */
140 rrd->live_head = (live_head_t *)malloc(sizeof(live_head_t));
141 if(rrd->live_head == NULL) {
142 rrd_set_error("live_head_t malloc");
146 fread(&rrd->live_head->last_up, sizeof(long), 1, *in_file);
147 rrd->live_head->last_up_usec = 0;
150 MYFREAD(rrd->live_head, live_head_t, 1)
152 MYFREAD(rrd->pdp_prep, pdp_prep_t, rrd->stat_head->ds_cnt)
153 MYFREAD(rrd->cdp_prep, cdp_prep_t, (rrd->stat_head->rra_cnt
154 * rrd->stat_head->ds_cnt))
155 MYFREAD(rrd->rra_ptr, rra_ptr_t, rrd->stat_head->rra_cnt)
161 void rrd_init(rrd_t *rrd)
163 rrd->stat_head = NULL;
166 rrd->live_head = NULL;
168 rrd->pdp_prep = NULL;
169 rrd->cdp_prep = NULL;
170 rrd->rrd_value = NULL;
173 void rrd_free(rrd_t *rrd)
175 if (rrd->stat_head) free(rrd->stat_head);
176 if (rrd->ds_def) free(rrd->ds_def);
177 if (rrd->rra_def) free(rrd->rra_def);
178 if (rrd->live_head) free(rrd->live_head);
179 if (rrd->rra_ptr) free(rrd->rra_ptr);
180 if (rrd->pdp_prep) free(rrd->pdp_prep);
181 if (rrd->cdp_prep) free(rrd->cdp_prep);
182 if (rrd->rrd_value) free(rrd->rrd_value);
185 /* routine used by external libraries to free memory allocated by
187 void rrd_freemem(void *mem)
193 int readfile(char *file_name, char **buffer, int skipfirst){
194 long writecnt=0,totalcnt = MEMBLK;
198 if ((strcmp("-",file_name) == 0)) { input = stdin; }
200 if ((input = fopen(file_name,"rb")) == NULL ){
201 rrd_set_error("opening '%s': %s",file_name,rrd_strerror(errno));
206 do { c = getc(input); offset++; } while (c != '\n' && ! feof(input));
208 if (strcmp("-",file_name)) {
209 fseek(input, 0, SEEK_END);
210 /* have extra space for detecting EOF without realloc */
211 totalcnt = (ftell(input) + 1) / sizeof(char) - offset;
212 if (totalcnt < MEMBLK)
213 totalcnt = MEMBLK; /* sanitize */
214 fseek(input, offset * sizeof(char), SEEK_SET);
216 if (((*buffer) = (char *) malloc((totalcnt+4) * sizeof(char))) == NULL) {
217 perror("Allocate Buffer:");
221 writecnt += fread((*buffer)+writecnt, 1, (totalcnt - writecnt) * sizeof(char),input);
222 if (writecnt >= totalcnt){
224 if (((*buffer)=rrd_realloc((*buffer), (totalcnt+4) * sizeof(char)))==NULL){
225 perror("Realloc Buffer:");
229 } while (! feof(input));
230 (*buffer)[writecnt] = '\0';
231 if (strcmp("-",file_name) != 0) {fclose(input);};