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/*-
* See the file LICENSE for redistribution information.
*
* Copyright (c) 2008-2011 WiredTiger, Inc.
* All rights reserved.
*/
#include "wt_internal.h"
/*
* __wt_open --
* Open a file handle.
*/
int
__wt_open(WT_SESSION_IMPL *session,
const char *name, mode_t mode, int ok_create, WT_FH **fhp)
{
const char *path;
WT_CONNECTION_IMPL *conn;
WT_FH *fh;
int f, fd, matched, ret;
conn = S2C(session);
fh = NULL;
fd = -1;
ret = 0;
WT_VERBOSE(session, FILEOPS, "fileops: %s: open", name);
/* Increment the reference count if we already have the file open. */
matched = 0;
__wt_lock(session, conn->mtx);
TAILQ_FOREACH(fh, &conn->fhqh, q) {
if (strcmp(name, fh->name) == 0) {
++fh->refcnt;
*fhp = fh;
matched = 1;
break;
}
}
__wt_unlock(session, conn->mtx);
if (matched)
return (0);
WT_RET(__wt_filename(session, name, &path));
f = O_RDWR;
#ifdef O_BINARY
/* Windows clones: we always want to treat the file as a binary. */
f |= O_BINARY;
#endif
if (ok_create)
f |= O_CREAT;
for (;;) {
if ((fd = open(path, f, mode)) != -1)
break;
switch (errno) {
case EAGAIN:
case EBUSY:
case EINTR:
case EMFILE:
case ENFILE:
case ENOSPC:
__wt_sleep(1L, 0L);
break;
default:
__wt_err(session, errno, "%s", name);
WT_ERR(errno);
}
}
WT_ERR(__wt_calloc(session, 1, sizeof(WT_FH), &fh));
WT_ERR(__wt_strdup(session, name, &fh->name));
#if defined(HAVE_FCNTL) && defined(FD_CLOEXEC)
/*
* Security:
* The application may spawn a new process, and we don't want another
* process to have access to our file handles. There's an obvious
* race here...
*/
if ((f = fcntl(fd, F_GETFD)) == -1 ||
fcntl(fd, F_SETFD, f | FD_CLOEXEC) == -1) {
__wt_err(session, errno, "%s: fcntl", name);
WT_ERR(errno);
}
#endif
fh->fd = fd;
fh->refcnt = 1;
/* Set the file's size. */
WT_ERR(__wt_filesize(session, fh, &fh->file_size));
/* Link onto the environment's list of files. */
__wt_lock(session, conn->mtx);
TAILQ_INSERT_TAIL(&conn->fhqh, fh, q);
__wt_unlock(session, conn->mtx);
*fhp = fh;
if (0) {
err: if (fh != NULL) {
__wt_free(session, fh->name);
__wt_free(session, fh);
}
if (fd != -1)
(void)close(fd);
}
__wt_free(session, path);
return (ret);
}
/*
* __wt_close --
* Close a file handle.
*/
int
__wt_close(WT_SESSION_IMPL *session, WT_FH *fh)
{
WT_CONNECTION_IMPL *conn;
int ret;
conn = S2C(session);
ret = 0;
if (fh == NULL || fh->refcnt == 0 || --fh->refcnt > 0)
return (0);
/* Remove from the list and discard the memory. */
__wt_lock(session, conn->mtx);
TAILQ_REMOVE(&conn->fhqh, fh, q);
__wt_unlock(session, conn->mtx);
if (close(fh->fd) != 0) {
__wt_err(session, errno, "%s", fh->name);
ret = WT_ERROR;
}
__wt_free(session, fh->name);
__wt_free(session, fh);
return (ret);
}
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