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add smbc_ftruncate() to emulate POSIX ftruncate()

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(This used to be commit 6f5051b9c1405ab1dc3e697419ceedb3acac46d8)
This commit is contained in:
Derrell Lipman 2008-02-26 21:44:51 -05:00
parent 346c94972a
commit fa341d5262
3 changed files with 112 additions and 0 deletions
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31
source3/include/libsmbclient.h
View File

@ -427,6 +427,8 @@ struct _SMBCCTX {
off_t (*lseek) (SMBCCTX *c, SMBCFILE * file, off_t offset, int whence);
int (*stat) (SMBCCTX *c, const char *fname, struct stat *st);
int (*fstat) (SMBCCTX *c, SMBCFILE *file, struct stat *st);
/* ftruncate added near _internal for ABI compatibility */
int (*close_fn) (SMBCCTX *c, SMBCFILE *file);
/** callable functions for dirs
@ -520,6 +522,12 @@ struct _SMBCCTX {
int flags;
/** user options selections that apply to this session
*
* NEW OPTIONS ARE NOT ADDED HERE!
*
* We must maintain ABI backward compatibility. We now use
* smbc_option_set() and smbc_option_get() for all newly added
* options.
*/
struct _smbc_options {
@ -580,6 +588,9 @@ struct _SMBCCTX {
int one_share_per_server;
} options;
/* Add additional functions here for ABI backward compatibility */
int (*ftruncate)(SMBCCTX *c, SMBCFILE *f, off_t size);
/** INTERNAL DATA
* do _NOT_ touch this from your program !
*/
@ -1193,6 +1204,26 @@ int smbc_stat(const char *url, struct stat *st);
int smbc_fstat(int fd, struct stat *st);
/**@ingroup attribute
* Truncate a file given a file descriptor
*
* @param fd Open file handle from smbc_open() or smbc_creat()
*
* @param size size to truncate the file to
*
* @return EBADF filedes is bad.
* - EACCES Permission denied.
* - EBADF fd is not a valid file descriptor
* - EINVAL Problems occurred in the underlying routines
* or smbc_init not called.
* - ENOMEM Out of memory
*
* @see , Unix ftruncate()
*
*/
int smbc_ftruncate(int fd, off_t size);
/**@ingroup attribue
* Change the ownership of a file or directory.
*

6
source3/libsmb/libsmb_compat.c
View File

@ -289,6 +289,12 @@ int smbc_fstat(int fd, struct stat *st)
return (statcont->fstat)(statcont, file, st);
}
int smbc_ftruncate(int fd, off_t size)
{
SMBCFILE * file = find_fd(fd);
return (statcont->ftruncate)(statcont, file, size);
}
int smbc_chmod(const char *url, mode_t mode)
{
return (statcont->chmod)(statcont, url, mode);

75
source3/libsmb/libsmbclient.c
View File

@ -2482,6 +2482,80 @@ smbc_fstat_ctx(SMBCCTX *context,
}
/*
* Routine to truncate a file given by its file descriptor, to a specified size
*/
static int
smbc_ftruncate_ctx(SMBCCTX *context,
SMBCFILE *file,
off_t length)
{
SMB_OFF_T size = length;
char *server = NULL;
char *share = NULL;
char *user = NULL;
char *password = NULL;
char *path = NULL;
char *targetpath = NULL;
struct cli_state *targetcli = NULL;
TALLOC_CTX *frame = talloc_stackframe();
if (!context || !context->internal ||
!context->internal->_initialized) {
errno = EINVAL;
TALLOC_FREE(frame);
return -1;
}
if (!file || !DLIST_CONTAINS(context->internal->_files, file)) {
errno = EBADF;
TALLOC_FREE(frame);
return -1;
}
if (!file->file) {
errno = EINVAL;
TALLOC_FREE(frame);
return -1;
}
/*d_printf(">>>fstat: parsing %s\n", file->fname);*/
if (smbc_parse_path(frame,
context,
file->fname,
NULL,
&server,
&share,
&path,
&user,
&password,
NULL)) {
errno = EINVAL;
TALLOC_FREE(frame);
return -1;
}
/*d_printf(">>>fstat: resolving %s\n", path);*/
if (!cli_resolve_path(frame, "", file->srv->cli, path,
&targetcli, &targetpath)) {
d_printf("Could not resolve %s\n", path);
TALLOC_FREE(frame);
return -1;
}
/*d_printf(">>>fstat: resolved path as %s\n", targetpath);*/
if (!cli_ftruncate(targetcli, file->cli_fd, size)) {
errno = EINVAL;
TALLOC_FREE(frame);
return -1;
}
TALLOC_FREE(frame);
return 0;
}
/*
* Routine to open a directory
* We accept the URL syntax explained in smbc_parse_path(), above.
@ -6703,6 +6777,7 @@ smbc_new_context(void)
context->telldir = smbc_telldir_ctx;
context->lseekdir = smbc_lseekdir_ctx;
context->fstatdir = smbc_fstatdir_ctx;
context->ftruncate = smbc_ftruncate_ctx;
context->chmod = smbc_chmod_ctx;
context->utimes = smbc_utimes_ctx;
context->setxattr = smbc_setxattr_ctx;