/**
* collectd - src/utils_tail.c
* Copyright (C) 2007-2008 C-Ware, Inc.
- * Copyright (C) 2008 Florian Forster
+ * Copyright (C) 2008 Florian Forster
*
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; only version 2 of the License is applicable.
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
*
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
*
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
*
* Author:
* Luke Heberling <lukeh at c-ware.com>
- * Florian Forster <octo at verplant.org>
+ * Florian Forster <octo at collectd.org>
*
* Description:
* Encapsulates useful code for plugins which must watch for appends to
**/
#include "collectd.h"
+
#include "common.h"
#include "utils_tail.h"
-struct cu_tail_s
-{
- char *file;
- FILE *fh;
- struct stat stat;
+struct cu_tail_s {
+ char *file;
+ FILE *fh;
+ struct stat stat;
};
-static int cu_tail_reopen (cu_tail_t *obj)
-{
+static int cu_tail_reopen(cu_tail_t *obj) {
int seek_end = 0;
FILE *fh;
- struct stat stat_buf;
+ struct stat stat_buf = {0};
int status;
- memset (&stat_buf, 0, sizeof (stat_buf));
- status = stat (obj->file, &stat_buf);
- if (status != 0)
- {
- char errbuf[1024];
- ERROR ("utils_tail: stat (%s) failed: %s", obj->file,
- sstrerror (errno, errbuf, sizeof (errbuf)));
- return (-1);
+ status = stat(obj->file, &stat_buf);
+ if (status != 0) {
+ ERROR("utils_tail: stat (%s) failed: %s", obj->file, STRERRNO);
+ return -1;
}
/* The file is already open.. */
- if ((obj->fh != NULL) && (stat_buf.st_ino == obj->stat.st_ino))
- {
+ if ((obj->fh != NULL) && (stat_buf.st_ino == obj->stat.st_ino)) {
/* Seek to the beginning if file was truncated */
- if (stat_buf.st_size < obj->stat.st_size)
- {
- INFO ("utils_tail: File `%s' was truncated.", obj->file);
- status = fseek (obj->fh, 0, SEEK_SET);
- if (status != 0)
- {
- char errbuf[1024];
- ERROR ("utils_tail: fseek (%s) failed: %s", obj->file,
- sstrerror (errno, errbuf, sizeof (errbuf)));
- fclose (obj->fh);
- obj->fh = NULL;
- return (-1);
+ if (stat_buf.st_size < obj->stat.st_size) {
+ INFO("utils_tail: File `%s' was truncated.", obj->file);
+ status = fseek(obj->fh, 0, SEEK_SET);
+ if (status != 0) {
+ ERROR("utils_tail: fseek (%s) failed: %s", obj->file, STRERRNO);
+ fclose(obj->fh);
+ obj->fh = NULL;
+ return -1;
}
}
- memcpy (&obj->stat, &stat_buf, sizeof (struct stat));
- return (1);
+ memcpy(&obj->stat, &stat_buf, sizeof(struct stat));
+ return 1;
}
/* Seek to the end if we re-open the same file again or the file opened
if ((obj->stat.st_ino == 0) || (obj->stat.st_ino == stat_buf.st_ino))
seek_end = 1;
- fh = fopen (obj->file, "r");
- if (fh == NULL)
- {
- char errbuf[1024];
- ERROR ("utils_tail: fopen (%s) failed: %s", obj->file,
- sstrerror (errno, errbuf, sizeof (errbuf)));
- return (-1);
+ fh = fopen(obj->file, "r");
+ if (fh == NULL) {
+ ERROR("utils_tail: fopen (%s) failed: %s", obj->file, STRERRNO);
+ return -1;
}
- if (seek_end != 0)
- {
- status = fseek (fh, 0, SEEK_END);
- if (status != 0)
- {
- char errbuf[1024];
- ERROR ("utils_tail: fseek (%s) failed: %s", obj->file,
- sstrerror (errno, errbuf, sizeof (errbuf)));
- fclose (fh);
- return (-1);
+ if (seek_end != 0) {
+ status = fseek(fh, 0, SEEK_END);
+ if (status != 0) {
+ ERROR("utils_tail: fseek (%s) failed: %s", obj->file, STRERRNO);
+ fclose(fh);
+ return -1;
}
}
if (obj->fh != NULL)
- fclose (obj->fh);
+ fclose(obj->fh);
obj->fh = fh;
- memcpy (&obj->stat, &stat_buf, sizeof (struct stat));
+ memcpy(&obj->stat, &stat_buf, sizeof(struct stat));
- return (0);
+ return 0;
} /* int cu_tail_reopen */
-cu_tail_t *cu_tail_create (const char *file)
-{
- cu_tail_t *obj;
+cu_tail_t *cu_tail_create(const char *file) {
+ cu_tail_t *obj;
- obj = (cu_tail_t *) malloc (sizeof (cu_tail_t));
- if (obj == NULL)
- return (NULL);
- memset (obj, '\0', sizeof (cu_tail_t));
+ obj = calloc(1, sizeof(*obj));
+ if (obj == NULL)
+ return NULL;
- obj->file = strdup (file);
- if (obj->file == NULL)
- {
- free (obj);
- return (NULL);
- }
+ obj->file = strdup(file);
+ if (obj->file == NULL) {
+ free(obj);
+ return NULL;
+ }
- obj->fh = NULL;
+ obj->fh = NULL;
- return (obj);
+ return obj;
} /* cu_tail_t *cu_tail_create */
-int cu_tail_destroy (cu_tail_t *obj)
-{
- if (obj->fh != NULL)
- fclose (obj->fh);
- free (obj->file);
- free (obj);
+int cu_tail_destroy(cu_tail_t *obj) {
+ if (obj->fh != NULL)
+ fclose(obj->fh);
+ free(obj->file);
+ free(obj);
- return (0);
+ return 0;
} /* int cu_tail_destroy */
-int cu_tail_readline (cu_tail_t *obj, char *buf, int buflen)
-{
+int cu_tail_readline(cu_tail_t *obj, char *buf, int buflen) {
int status;
- if (buflen < 1)
- {
- ERROR ("utils_tail: cu_tail_readline: buflen too small: %i bytes.",
- buflen);
- return (-1);
+ if (buflen < 1) {
+ ERROR("utils_tail: cu_tail_readline: buflen too small: %i bytes.", buflen);
+ return -1;
}
- if (obj->fh == NULL)
- {
- status = cu_tail_reopen (obj);
+ if (obj->fh == NULL) {
+ status = cu_tail_reopen(obj);
if (status < 0)
- return (status);
+ return status;
}
- assert (obj->fh != NULL);
+ assert(obj->fh != NULL);
/* Try to read from the filehandle. If that succeeds, everything appears to
* be fine and we can return. */
- clearerr (obj->fh);
- if (fgets (buf, buflen, obj->fh) != NULL)
- {
+ clearerr(obj->fh);
+ if (fgets(buf, buflen, obj->fh) != NULL) {
buf[buflen - 1] = 0;
- return (0);
+ return 0;
}
/* Check if we encountered an error */
- if (ferror (obj->fh) != 0)
- {
+ if (ferror(obj->fh) != 0) {
/* Jupp, error. Force `cu_tail_reopen' to reopen the file.. */
- fclose (obj->fh);
+ fclose(obj->fh);
obj->fh = NULL;
}
/* else: eof -> check if the file was moved away and reopen the new file if
* so.. */
- status = cu_tail_reopen (obj);
+ status = cu_tail_reopen(obj);
/* error -> return with error */
if (status < 0)
- return (status);
+ return status;
/* file end reached and file not reopened -> nothing more to read */
- else if (status > 0)
- {
+ else if (status > 0) {
buf[0] = 0;
- return (0);
+ return 0;
}
/* If we get here: file was re-opened and there may be more to read.. Let's
* try again. */
- if (fgets (buf, buflen, obj->fh) != NULL)
- {
+ if (fgets(buf, buflen, obj->fh) != NULL) {
buf[buflen - 1] = 0;
- return (0);
+ return 0;
}
- if (ferror (obj->fh) != 0)
- {
- char errbuf[1024];
- WARNING ("utils_tail: fgets (%s) returned an error: %s", obj->file,
- sstrerror (errno, errbuf, sizeof (errbuf)));
- fclose (obj->fh);
+ if (ferror(obj->fh) != 0) {
+ WARNING("utils_tail: fgets (%s) returned an error: %s", obj->file,
+ STRERRNO);
+ fclose(obj->fh);
obj->fh = NULL;
- return (-1);
+ return -1;
}
/* EOf, well, apparently the new file is empty.. */
buf[0] = 0;
- return (0);
+ return 0;
} /* int cu_tail_readline */
-int cu_tail_read (cu_tail_t *obj, char *buf, int buflen, tailfunc_t *callback,
- void *data)
-{
- int status;
-
- while (42)
- {
- size_t len;
-
- status = cu_tail_readline (obj, buf, buflen);
- if (status != 0)
- {
- ERROR ("utils_tail: cu_tail_read: cu_tail_readline "
- "failed.");
- break;
- }
-
- /* check for EOF */
- if (buf[0] == 0)
- break;
-
- len = strlen (buf);
- while (len > 0) {
- if (buf[len - 1] != '\n')
- break;
- buf[len - 1] = '\0';
- len--;
- }
-
- status = callback (data, buf, buflen);
- if (status != 0)
- {
- ERROR ("utils_tail: cu_tail_read: callback returned "
- "status %i.", status);
- break;
- }
- }
-
- return status;
+int cu_tail_read(cu_tail_t *obj, char *buf, int buflen, tailfunc_t *callback,
+ void *data) {
+ int status;
+
+ while (42) {
+ size_t len;
+
+ status = cu_tail_readline(obj, buf, buflen);
+ if (status != 0) {
+ ERROR("utils_tail: cu_tail_read: cu_tail_readline "
+ "failed.");
+ break;
+ }
+
+ /* check for EOF */
+ if (buf[0] == 0)
+ break;
+
+ len = strlen(buf);
+ while (len > 0) {
+ if (buf[len - 1] != '\n')
+ break;
+ buf[len - 1] = '\0';
+ len--;
+ }
+
+ status = callback(data, buf, buflen);
+ if (status != 0) {
+ ERROR("utils_tail: cu_tail_read: callback returned "
+ "status %i.",
+ status);
+ break;
+ }
+ }
+
+ return status;
} /* int cu_tail_read */
projects / collectd.git / blobdiff