1 /*****************************************************************************
2 * RRDtool 1.1.x Copyright Tobias Oetiker, 1997 - 2002
3 *****************************************************************************
4 * rrd_open.c Open an RRD File
5 *****************************************************************************
8 * Revision 1.5 2002/06/20 00:21:03 jake
9 * More Win32 build changes; thanks to Kerry Calvert.
11 * Revision 1.4 2002/02/01 20:34:49 oetiker
12 * fixed version number and date/time
14 * Revision 1.3 2001/03/04 13:01:55 oetiker
15 * Aberrant Behavior Detection support. A brief overview added to rrdtool.pod.
16 * Major updates to rrd_update.c, rrd_create.c. Minor update to other core files.
17 * This is backwards compatible! But new files using the Aberrant stuff are not readable
18 * by old rrdtool versions. See http://cricket.sourceforge.net/aberrant/rrd_hw.htm
19 * -- Jake Brutlag <jakeb@corp.webtv.net>
21 * Revision 1.2 2001/03/04 10:29:20 oetiker
22 * fixed filedescriptor leak
23 * -- Mike Franusich <mike@franusich.com>
25 * Revision 1.1.1.1 2001/02/25 22:25:05 oetiker
28 *****************************************************************************/
33 /* open a database file, return its header and a open filehandle */
34 /* positioned to the first cdp in the first rra */
37 rrd_open(char *file_name, FILE **in_file, rrd_t *rrd, int rdwr)
43 if (rdwr == RRD_READONLY) {
57 if (((*in_file) = fopen(file_name,mode)) == NULL ){
58 rrd_set_error("opening '%s': %s",file_name, strerror(errno));
62 if (rdwr == RRD_READWRITE)
64 if (setvbuf((*in_file),NULL,_IONBF,2)) {
65 rrd_set_error("failed to disable the stream buffer\n");
71 #define MYFREAD(MYVAR,MYVART,MYCNT) \
72 if ((MYVAR = malloc(sizeof(MYVART) * MYCNT)) == NULL) {\
73 rrd_set_error("" #MYVAR " malloc"); \
76 fread(MYVAR,sizeof(MYVART),MYCNT, *in_file);
79 MYFREAD(rrd->stat_head, stat_head_t, 1)
81 /* lets do some test if we are on track ... */
82 if (strncmp(rrd->stat_head->cookie,RRD_COOKIE,4) != 0){
83 rrd_set_error("'%s' is not an RRD file",file_name);
88 if (atoi(rrd->stat_head->version) > atoi(RRD_VERSION)){
89 rrd_set_error("can't handle RRD file version %s",
90 rrd->stat_head->version);
95 if (rrd->stat_head->float_cookie != FLOAT_COOKIE){
96 rrd_set_error("This RRD was created on other architecture");
101 MYFREAD(rrd->ds_def, ds_def_t, rrd->stat_head->ds_cnt)
102 MYFREAD(rrd->rra_def, rra_def_t, rrd->stat_head->rra_cnt)
103 MYFREAD(rrd->live_head, live_head_t, 1)
104 MYFREAD(rrd->pdp_prep, pdp_prep_t, rrd->stat_head->ds_cnt)
105 MYFREAD(rrd->cdp_prep, cdp_prep_t, (rrd->stat_head->rra_cnt
106 * rrd->stat_head->ds_cnt))
107 MYFREAD(rrd->rra_ptr, rra_ptr_t, rrd->stat_head->rra_cnt)
113 void rrd_init(rrd_t *rrd)
115 rrd->stat_head = NULL;
118 rrd->live_head = NULL;
120 rrd->pdp_prep = NULL;
121 rrd->cdp_prep = NULL;
122 rrd->rrd_value = NULL;
125 void rrd_free(rrd_t *rrd)
127 free(rrd->stat_head);
130 free(rrd->live_head);
134 free(rrd->rrd_value);
137 /* routine used by external libraries to free memory allocated by
139 void rrd_freemem(void *mem)
145 int readfile(char *file_name, char **buffer, int skipfirst){
146 long writecnt=0,totalcnt = MEMBLK;
149 if ((strcmp("-",file_name) == 0)) { input = stdin; }
151 if ((input = fopen(file_name,"rb")) == NULL ){
152 rrd_set_error("opening '%s': %s",file_name,strerror(errno));
157 do { c = getc(input); } while (c != '\n' && ! feof(input));
159 if (((*buffer) = (char *) malloc((MEMBLK+4)*sizeof(char))) == NULL) {
160 perror("Allocate Buffer:");
164 writecnt += fread((*buffer)+writecnt, 1, MEMBLK * sizeof(char) ,input);
165 if (writecnt >= totalcnt){
167 if (((*buffer)=rrd_realloc((*buffer), (totalcnt+4) * sizeof(char)))==NULL){
168 perror("Realloc Buffer:");
172 } while (! feof(input));
173 (*buffer)[writecnt] = '\0';
174 if (strcmp("-",file_name) != 0) {fclose(input);};