1 /*****************************************************************************
2 * RRDtool 1.1.x Copyright Tobias Oetiker, 1997 - 2002
3 *****************************************************************************
4 * rrd_open.c Open an RRD File
5 *****************************************************************************
8 * Revision 1.7 2003/03/31 21:22:12 oetiker
9 * enables RRDtool updates with microsecond or in case of windows millisecond
10 * precision. This is needed to reduce time measurement error when archive step
11 * is small. (<30s) -- Sasha Mikheev <sasha@avalon-net.co.il>
13 * Revision 1.6 2003/02/13 07:05:27 oetiker
14 * Find attached the patch I promised to send to you. Please note that there
15 * are three new source files (src/rrd_is_thread_safe.h, src/rrd_thread_safe.c
16 * and src/rrd_not_thread_safe.c) and the introduction of librrd_th. This
17 * library is identical to librrd, but it contains support code for per-thread
18 * global variables currently used for error information only. This is similar
19 * to how errno per-thread variables are implemented. librrd_th must be linked
20 * alongside of libpthred
22 * There is also a new file "THREADS", holding some documentation.
24 * -- Peter Stamfest <peter@stamfest.at>
26 * Revision 1.5 2002/06/20 00:21:03 jake
27 * More Win32 build changes; thanks to Kerry Calvert.
29 * Revision 1.4 2002/02/01 20:34:49 oetiker
30 * fixed version number and date/time
32 * Revision 1.3 2001/03/04 13:01:55 oetiker
33 * Aberrant Behavior Detection support. A brief overview added to rrdtool.pod.
34 * Major updates to rrd_update.c, rrd_create.c. Minor update to other core files.
35 * This is backwards compatible! But new files using the Aberrant stuff are not readable
36 * by old rrdtool versions. See http://cricket.sourceforge.net/aberrant/rrd_hw.htm
37 * -- Jake Brutlag <jakeb@corp.webtv.net>
39 * Revision 1.2 2001/03/04 10:29:20 oetiker
40 * fixed filedescriptor leak
41 * -- Mike Franusich <mike@franusich.com>
43 * Revision 1.1.1.1 2001/02/25 22:25:05 oetiker
46 *****************************************************************************/
51 /* open a database file, return its header and a open filehandle */
52 /* positioned to the first cdp in the first rra */
55 rrd_open(char *file_name, FILE **in_file, rrd_t *rrd, int rdwr)
63 if (rdwr == RRD_READONLY) {
77 if (((*in_file) = fopen(file_name,mode)) == NULL ){
78 rrd_set_error("opening '%s': %s",file_name, rrd_strerror(errno));
82 if (rdwr == RRD_READWRITE)
84 if (setvbuf((*in_file),NULL,_IONBF,2)) {
85 rrd_set_error("failed to disable the stream buffer\n");
91 #define MYFREAD(MYVAR,MYVART,MYCNT) \
92 if ((MYVAR = malloc(sizeof(MYVART) * MYCNT)) == NULL) {\
93 rrd_set_error("" #MYVAR " malloc"); \
96 fread(MYVAR,sizeof(MYVART),MYCNT, *in_file);
99 MYFREAD(rrd->stat_head, stat_head_t, 1)
100 version = atoi(rrd->stat_head->version);
102 /* lets do some test if we are on track ... */
103 if (strncmp(rrd->stat_head->cookie,RRD_COOKIE,4) != 0){
104 rrd_set_error("'%s' is not an RRD file",file_name);
105 free(rrd->stat_head);
109 if (version > atoi(RRD_VERSION)){
110 rrd_set_error("can't handle RRD file version %s",
111 rrd->stat_head->version);
112 free(rrd->stat_head);
116 if (rrd->stat_head->float_cookie != FLOAT_COOKIE){
117 rrd_set_error("This RRD was created on other architecture");
118 free(rrd->stat_head);
122 MYFREAD(rrd->ds_def, ds_def_t, rrd->stat_head->ds_cnt)
123 MYFREAD(rrd->rra_def, rra_def_t, rrd->stat_head->rra_cnt)
124 /* handle different format for the live_head */
126 rrd->live_head = (live_head_t *)malloc(sizeof(live_head_t));
127 if(rrd->live_head == NULL) {
128 rrd_set_error("live_head_t malloc");
132 fread(&rrd->live_head->last_up, sizeof(long), 1, *in_file);
135 MYFREAD(rrd->live_head, live_head_t, 1)
137 MYFREAD(rrd->pdp_prep, pdp_prep_t, rrd->stat_head->ds_cnt)
138 MYFREAD(rrd->cdp_prep, cdp_prep_t, (rrd->stat_head->rra_cnt
139 * rrd->stat_head->ds_cnt))
140 MYFREAD(rrd->rra_ptr, rra_ptr_t, rrd->stat_head->rra_cnt)
146 void rrd_init(rrd_t *rrd)
148 rrd->stat_head = NULL;
151 rrd->live_head = NULL;
153 rrd->pdp_prep = NULL;
154 rrd->cdp_prep = NULL;
155 rrd->rrd_value = NULL;
158 void rrd_free(rrd_t *rrd)
160 if (rrd->stat_head) free(rrd->stat_head);
161 if (rrd->ds_def) free(rrd->ds_def);
162 if (rrd->rra_def) free(rrd->rra_def);
163 if (rrd->live_head) free(rrd->live_head);
164 if (rrd->rra_ptr) free(rrd->rra_ptr);
165 if (rrd->pdp_prep) free(rrd->pdp_prep);
166 if (rrd->cdp_prep) free(rrd->cdp_prep);
167 if (rrd->rrd_value) free(rrd->rrd_value);
170 /* routine used by external libraries to free memory allocated by
172 void rrd_freemem(void *mem)
178 int readfile(char *file_name, char **buffer, int skipfirst){
179 long writecnt=0,totalcnt = MEMBLK;
182 if ((strcmp("-",file_name) == 0)) { input = stdin; }
184 if ((input = fopen(file_name,"rb")) == NULL ){
185 rrd_set_error("opening '%s': %s",file_name,rrd_strerror(errno));
190 do { c = getc(input); } while (c != '\n' && ! feof(input));
192 if (((*buffer) = (char *) malloc((MEMBLK+4)*sizeof(char))) == NULL) {
193 perror("Allocate Buffer:");
197 writecnt += fread((*buffer)+writecnt, 1, MEMBLK * sizeof(char) ,input);
198 if (writecnt >= totalcnt){
200 if (((*buffer)=rrd_realloc((*buffer), (totalcnt+4) * sizeof(char)))==NULL){
201 perror("Realloc Buffer:");
205 } while (! feof(input));
206 (*buffer)[writecnt] = '\0';
207 if (strcmp("-",file_name) != 0) {fclose(input);};