/*****************************************************************************
- * RRDtool 1.0.33 Copyright Tobias Oetiker, 1997 - 2000
+ * RRDtool 1.2.23 Copyright by Tobi Oetiker, 1997-2007
*****************************************************************************
* rrd_open.c Open an RRD File
*****************************************************************************
* $Id$
* $Log$
+ * Revision 1.10 2004/05/26 22:11:12 oetiker
+ * reduce compiler warnings. Many small fixes. -- Mike Slifcak <slif@bellsouth.net>
+ *
+ * Revision 1.9 2003/04/29 21:56:49 oetiker
+ * readline in rrd_open.c reads the file in 8 KB blocks, and calls realloc for
+ * each block. realloc is very slow in Mac OS X for huge blocks, e.g. when
+ * restoring databases from huge xml files. This patch finds the size of the
+ * file, and starts out with malloc'ing the full size.
+ * -- Peter Speck <speck@ruc.dk>
+ *
+ * Revision 1.8 2003/04/11 19:43:44 oetiker
+ * New special value COUNT which allows calculations based on the position of a
+ * value within a data set. Bug fix in rrd_rpncalc.c. PREV returned erroneus
+ * value for the second value. Bug fix in rrd_restore.c. Bug causing seek error
+ * when accesing an RRD restored from an xml that holds an RRD version <3.
+ * -- Ruben Justo <ruben@ainek.com>
+ *
+ * Revision 1.7 2003/03/31 21:22:12 oetiker
+ * enables RRDtool updates with microsecond or in case of windows millisecond
+ * precision. This is needed to reduce time measurement error when archive step
+ * is small. (<30s) -- Sasha Mikheev <sasha@avalon-net.co.il>
+ *
+ * Revision 1.6 2003/02/13 07:05:27 oetiker
+ * Find attached the patch I promised to send to you. Please note that there
+ * are three new source files (src/rrd_is_thread_safe.h, src/rrd_thread_safe.c
+ * and src/rrd_not_thread_safe.c) and the introduction of librrd_th. This
+ * library is identical to librrd, but it contains support code for per-thread
+ * global variables currently used for error information only. This is similar
+ * to how errno per-thread variables are implemented. librrd_th must be linked
+ * alongside of libpthred
+ *
+ * There is also a new file "THREADS", holding some documentation.
+ *
+ * -- Peter Stamfest <peter@stamfest.at>
+ *
+ * Revision 1.5 2002/06/20 00:21:03 jake
+ * More Win32 build changes; thanks to Kerry Calvert.
+ *
+ * Revision 1.4 2002/02/01 20:34:49 oetiker
+ * fixed version number and date/time
+ *
* Revision 1.3 2001/03/04 13:01:55 oetiker
* Aberrant Behavior Detection support. A brief overview added to rrdtool.pod.
* Major updates to rrd_update.c, rrd_create.c. Minor update to other core files.
*****************************************************************************/
#include "rrd_tool.h"
+#include "unused.h"
#define MEMBLK 8192
/* open a database file, return its header and a open filehandle */
/* positioned to the first cdp in the first rra */
-int
-rrd_open(char *file_name, FILE **in_file, rrd_t *rrd, int rdwr)
+rrd_file_t *rrd_open(
+ const char *const file_name,
+ rrd_t *rrd,
+ unsigned rdwr)
{
+ int flags = 0;
+ mode_t mode = S_IRUSR;
+ int version, prot = PROT_READ;
+ off_t offset = 0;
+ char *data;
+ struct stat statb;
+ rrd_file_t *rrd_file = malloc(sizeof(rrd_file_t));
-
- char *mode = NULL;
+ if (rrd_file == NULL) {
+ rrd_set_error("allocating rrd_file descriptor for '%s'", file_name);
+ return NULL;
+ }
+ memset(rrd_file, 0, sizeof(rrd_file_t));
rrd_init(rrd);
- if (rdwr == RRD_READONLY) {
-#ifndef WIN32
- mode = "r";
-#else
- mode = "rb";
-#endif
- } else {
-#ifndef WIN32
- mode = "r+";
-#else
- mode = "rb+";
+ if (rdwr == RRD_READWRITE) {
+ mode |= S_IWUSR;
+ prot |= PROT_WRITE;
+ } else if (rdwr == RRD_CREAT) {
+ mode |= S_IWUSR;
+ prot |= PROT_WRITE;
+ flags |= (O_CREAT | O_TRUNC);
+ }
+#ifdef O_NONBLOCK
+ flags |= O_NONBLOCK;
#endif
+
+ if ((rrd_file->fd = open(file_name, flags, mode)) < 0) {
+ rrd_set_error("opening '%s': %s", file_name, rrd_strerror(errno));
+ return NULL;
}
-
- if (((*in_file) = fopen(file_name,mode)) == NULL ){
- rrd_set_error("opening '%s': %s",file_name, strerror(errno));
- return (-1);
+
+ /* ???: length = lseek(rrd_file->fd, 0, SEEK_END); */
+ /* ??? locking the whole area of the file may overdo it a bit, does it? */
+ if ((fstat(rrd_file->fd, &statb)) < 0) {
+ rrd_set_error("fstat '%s': %s", file_name, rrd_strerror(errno));
+ goto out_close;
}
+ rrd_file->file_len = statb.st_size;
+
+#ifdef HAVE_POSIX_FADVISE
+ /* In general we need no read-ahead when dealing with rrd_files.
+ When we stop reading, it is highly unlikely that we start up again.
+ In this manner we actually save time and diskaccess (and buffer cache).
+ Thanks to Dave Plonka for the Idea of using POSIX_FADV_RANDOM here. */
+ if (0 != posix_fadvise(rrd_file->fd, 0, 0, POSIX_FADV_RANDOM)) {
+ rrd_set_error("setting POSIX_FADV_RANDOM on '%s': %s", file_name,
+ rrd_strerror(errno));
+ goto out_close;
+ }
+#endif
+
/*
- if (rdwr == RRD_READWRITE)
- {
- if (setvbuf((*in_file),NULL,_IONBF,2)) {
- rrd_set_error("failed to disable the stream buffer\n");
- return (-1);
- }
- }
+ if (rdwr == RRD_READWRITE)
+ {
+ if (setvbuf((rrd_file->fd),NULL,_IONBF,2)) {
+ rrd_set_error("failed to disable the stream buffer\n");
+ return (-1);
+ }
+ }
*/
-
-#define MYFREAD(MYVAR,MYVART,MYCNT) \
- if ((MYVAR = malloc(sizeof(MYVART) * MYCNT)) == NULL) {\
- rrd_set_error("" #MYVAR " malloc"); \
- fclose(*in_file); \
- return (-1); } \
- fread(MYVAR,sizeof(MYVART),MYCNT, *in_file);
-
-
- MYFREAD(rrd->stat_head, stat_head_t, 1)
-
- /* lets do some test if we are on track ... */
- if (strncmp(rrd->stat_head->cookie,RRD_COOKIE,4) != 0){
- rrd_set_error("'%s' is not an RRD file",file_name);
- free(rrd->stat_head);
- fclose(*in_file);
- return(-1);}
-
- if (atoi(rrd->stat_head->version) > atoi(RRD_VERSION)){
- rrd_set_error("can't handle RRD file version %s",
- rrd->stat_head->version);
- free(rrd->stat_head);
- fclose(*in_file);
- return(-1);}
-
- if (rrd->stat_head->float_cookie != FLOAT_COOKIE){
- rrd_set_error("This RRD was created on other architecture");
- free(rrd->stat_head);
- fclose(*in_file);
- return(-1);}
-
- MYFREAD(rrd->ds_def, ds_def_t, rrd->stat_head->ds_cnt)
- MYFREAD(rrd->rra_def, rra_def_t, rrd->stat_head->rra_cnt)
- MYFREAD(rrd->live_head, live_head_t, 1)
- MYFREAD(rrd->pdp_prep, pdp_prep_t, rrd->stat_head->ds_cnt)
- MYFREAD(rrd->cdp_prep, cdp_prep_t, (rrd->stat_head->rra_cnt
- * rrd->stat_head->ds_cnt))
- MYFREAD(rrd->rra_ptr, rra_ptr_t, rrd->stat_head->rra_cnt)
-#undef MYFREAD
-
- return(0);
+ data = mmap(0, rrd_file->file_len, prot, MAP_SHARED,
+ rrd_file->fd, offset);
+
+ /* lets see if the first read worked */
+ if (data == MAP_FAILED) {
+ rrd_set_error("error mmaping file '%s'", file_name);
+ goto out_close;
+ }
+ rrd_file->file_start = data;
+#ifdef USE_MADVISE
+ if (rrd == NULL) { /*XXX: currently not used! */
+ /* We will read everything in a moment (copying) */
+ madvise(data, rrd_file->file_len, MADV_WILLNEED | MADV_SEQUENTIAL);
+ goto out_done;
+ }
+ /* We do not need to read anything in for the moment */
+ madvise(data, rrd_file->file_len, MADV_DONTNEED);
+#endif
+
+#ifdef USE_MADVISE
+ /* the stat_head will be needed soonish, so hint accordingly */
+ madvise(data + offset, sizeof(stat_head_t), MADV_WILLNEED);
+#endif
+
+ rrd->stat_head = (stat_head_t *) (data + offset);
+ offset += sizeof(stat_head_t);
+
+ /* lets do some test if we are on track ... */
+ if (memcmp(rrd->stat_head->cookie, RRD_COOKIE, sizeof(RRD_COOKIE)) != 0) {
+ rrd_set_error("'%s' is not an RRD file", file_name);
+ goto out_nullify_head;
+ }
+
+ if (rrd->stat_head->float_cookie != FLOAT_COOKIE) {
+ rrd_set_error("This RRD was created on other architecture");
+ goto out_nullify_head;
+ }
+
+ version = atoi(rrd->stat_head->version);
+
+ if (version > atoi(RRD_VERSION)) {
+ rrd_set_error("can't handle RRD file version %s",
+ rrd->stat_head->version);
+ goto out_nullify_head;
+ }
+#ifdef USE_MADVISE
+ /* the ds_def will be needed soonish, so hint accordingly */
+ madvise(data + offset, sizeof(ds_def_t) * rrd->stat_head->ds_cnt,
+ MADV_WILLNEED);
+#endif
+ rrd->ds_def = (ds_def_t *) (data + offset);
+ offset += sizeof(ds_def_t) * rrd->stat_head->ds_cnt;
+
+#ifdef USE_MADVISE
+ /* the rra_def will be needed soonish, so hint accordingly */
+ madvise(data + offset, sizeof(rra_def_t) * rrd->stat_head->rra_cnt,
+ MADV_WILLNEED);
+#endif
+ rrd->rra_def = (rra_def_t *) (data + offset);
+ offset += sizeof(rra_def_t) * rrd->stat_head->rra_cnt;
+
+ /* handle different format for the live_head */
+ if (version < 3) {
+ rrd->live_head = (live_head_t *) malloc(sizeof(live_head_t));
+ if (rrd->live_head == NULL) {
+ rrd_set_error("live_head_t malloc");
+ goto out_close;
+ }
+ memmove(&rrd->live_head->last_up, data + offset, sizeof(long));
+ rrd->live_head->last_up_usec = 0;
+ } else {
+#ifdef USE_MADVISE
+ /* the live_head will be needed soonish, so hint accordingly */
+ madvise(data + offset, sizeof(live_head_t), MADV_WILLNEED);
+#endif
+ rrd->live_head = (live_head_t *) (data + offset);
+ offset += sizeof(live_head_t);
+ }
+// This doesn't look like it needs madvise
+ rrd->pdp_prep = (pdp_prep_t *) (data + offset);
+ offset += sizeof(pdp_prep_t) * rrd->stat_head->ds_cnt;
+
+// This could benefit from madvise()ing
+ rrd->cdp_prep = (cdp_prep_t *) (data + offset);
+ offset += sizeof(cdp_prep_t) *
+ (rrd->stat_head->rra_cnt * rrd->stat_head->ds_cnt);
+
+// This could benefit from madvise()ing
+ rrd->rra_ptr = (rra_ptr_t *) (data + offset);
+ offset += sizeof(rra_ptr_t) * rrd->stat_head->rra_cnt;
+#ifdef USE_MADVISE
+ out_done:
+#endif
+ rrd_file->header_len = offset;
+ rrd_file->pos = offset;
+/* we could close(rrd_file->fd); here, the mapping is still valid anyway */
+ return (rrd_file);
+ out_nullify_head:
+ rrd->stat_head = NULL;
+ out_close:
+ close(rrd_file->fd);
+ return NULL;
+}
+
+/* Close a reference to an rrd_file. */
+int rrd_close(
+ rrd_file_t *rrd_file)
+{
+ int ret = 0;
+
+#ifdef HAVE_MMAP
+ ret = munmap(rrd_file->file_start, rrd_file->file_len);
+// if (ret != 0)
+// rrd_set_error("munmap rrd_file");
+#endif
+ free(rrd_file);
+ rrd_file = NULL;
+ return ret;
+}
+
+/* Set position of rrd_file. */
+off_t rrd_seek(
+ rrd_file_t *rrd_file,
+ off_t off,
+ int whence)
+{
+ off_t ret = 0;
+
+#ifdef HAVE_MMAP
+ if (whence == SEEK_SET)
+ rrd_file->pos = off;
+ else if (whence == SEEK_CUR)
+ rrd_file->pos += off;
+ else if (whence == SEEK_END)
+ rrd_file->pos = rrd_file->file_len + off;
+#else
+ ret = lseek(rrd_file->fd, off, whence);
+ if (ret < 0)
+ rrd_set_error("lseek: %s", rrd_strerror(errno));
+ rrd_file->pos = ret;
+#endif
+//XXX: mimic fseek, which returns 0 upon success
+ return ret == -1; //XXX: or just ret to mimic lseek
+}
+
+/* Get current position in rrd_file. */
+off_t rrd_tell(
+ rrd_file_t *rrd_file)
+{
+ return rrd_file->pos;
+}
+
+/* read count bytes into buffer buf, starting at rrd_file->pos.
+ * Returns the number of bytes read. */
+ssize_t rrd_read(
+ rrd_file_t *rrd_file,
+ void *buf,
+ size_t count)
+{
+#ifdef HAVE_MMAP
+ char *pos = rrd_file->file_start + rrd_file->pos;
+
+ buf = memmove(buf, pos, count);
+ return count;
+#else
+ ssize_t ret;
+
+ ret = read(rrd_file->fd, buf, count);
+ //XXX: eventually add generic rrd_set_error(""); here
+ return ret;
+#endif
}
-void rrd_init(rrd_t *rrd)
+/* write count bytes from buffer buf to the current position
+ * rrd_file->pos of rrd_file->fd. */
+ssize_t rrd_write(
+ rrd_file_t *rrd_file,
+ const void *buf,
+ size_t count)
+{
+ ssize_t ret = count;
+
+#ifdef HAVE_MMAP
+ char *off, *new_pos;
+
+ off = rrd_file->file_start + rrd_file->pos;
+ new_pos = memmove(rrd_file->file_start + rrd_file->pos, buf, count);
+ ret = new_pos - off;
+#else
+ ret = write(rrd_file->fd, buf, count)
+#endif
+ return ret;
+}
+
+/* flush all data pending to be written to FD. */
+void rrd_flush(
+ rrd_file_t *rrd_file)
+{
+ if (fdatasync(rrd_file->fd) != 0) {
+ rrd_set_error("flushing fd %d: %s", rrd_file->fd,
+ rrd_strerror(errno));
+ }
+}
+
+void rrd_init(
+ rrd_t *rrd)
{
rrd->stat_head = NULL;
rrd->ds_def = NULL;
rrd->rrd_value = NULL;
}
-void rrd_free(rrd_t *rrd)
+void rrd_free(
+ rrd_t UNUSED(*rrd))
{
+#ifndef HAVE_MMAP
+ if (atoi(rrd->stat_head->version) < 3)
+ free(rrd->live_head);
free(rrd->stat_head);
free(rrd->ds_def);
free(rrd->rra_def);
- free(rrd->live_head);
free(rrd->rra_ptr);
free(rrd->pdp_prep);
free(rrd->cdp_prep);
free(rrd->rrd_value);
+#endif
+}
+
+/* routine used by external libraries to free memory allocated by
+ * rrd library */
+void rrd_freemem(
+ void *mem)
+{
+ free(mem);
}
-int readfile(char *file_name, char **buffer, int skipfirst){
- long writecnt=0,totalcnt = MEMBLK;
- FILE *input=NULL;
- char c ;
- if ((strcmp("-",file_name) == 0)) { input = stdin; }
- else {
- if ((input = fopen(file_name,"rb")) == NULL ){
- rrd_set_error("opening '%s': %s",file_name,strerror(errno));
- return (-1);
- }
+int readfile(
+ const char *file_name,
+ char **buffer,
+ int skipfirst)
+{
+ long writecnt = 0, totalcnt = MEMBLK;
+ long offset = 0;
+ FILE *input = NULL;
+ char c;
+
+ if ((strcmp("-", file_name) == 0)) {
+ input = stdin;
+ } else {
+ if ((input = fopen(file_name, "rb")) == NULL) {
+ rrd_set_error("opening '%s': %s", file_name, rrd_strerror(errno));
+ return (-1);
+ }
+ }
+ if (skipfirst) {
+ do {
+ c = getc(input);
+ offset++;
+ } while (c != '\n' && !feof(input));
}
- if (skipfirst){
- do { c = getc(input); } while (c != '\n' && ! feof(input));
+ if (strcmp("-", file_name)) {
+ fseek(input, 0, SEEK_END);
+ /* have extra space for detecting EOF without realloc */
+ totalcnt = (ftell(input) + 1) / sizeof(char) - offset;
+ if (totalcnt < MEMBLK)
+ totalcnt = MEMBLK; /* sanitize */
+ fseek(input, offset * sizeof(char), SEEK_SET);
}
- if (((*buffer) = (char *) malloc((MEMBLK+4)*sizeof(char))) == NULL) {
- perror("Allocate Buffer:");
- exit(1);
+ if (((*buffer) = (char *) malloc((totalcnt + 4) * sizeof(char))) == NULL) {
+ perror("Allocate Buffer:");
+ exit(1);
};
- do{
- writecnt += fread((*buffer)+writecnt, 1, MEMBLK * sizeof(char) ,input);
- if (writecnt >= totalcnt){
- totalcnt += MEMBLK;
- if (((*buffer)=rrd_realloc((*buffer), (totalcnt+4) * sizeof(char)))==NULL){
- perror("Realloc Buffer:");
- exit(1);
- };
- }
- } while (! feof(input));
+ do {
+ writecnt +=
+ fread((*buffer) + writecnt, 1,
+ (totalcnt - writecnt) * sizeof(char), input);
+ if (writecnt >= totalcnt) {
+ totalcnt += MEMBLK;
+ if (((*buffer) =
+ rrd_realloc((*buffer),
+ (totalcnt + 4) * sizeof(char))) == NULL) {
+ perror("Realloc Buffer:");
+ exit(1);
+ };
+ }
+ } while (!feof(input));
(*buffer)[writecnt] = '\0';
- if (strcmp("-",file_name) != 0) {fclose(input);};
+ if (strcmp("-", file_name) != 0) {
+ fclose(input);
+ };
return writecnt;
}
-
-
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