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lib/tsocket: add tdgram_bsd_existing_socket() helper function

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This is similar to tstream_bsd_existing_socket().
Both help to migrate strange code path to using the tstream or tdgram
abstractions.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=11316

Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
This commit is contained in:
Stefan Metzmacher 2015-05-21 11:37:06 +02:00
parent 44584f8107
commit 3a8b7b0518
2 changed files with 66 additions and 0 deletions
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42
lib/tsocket/tsocket.h
View File

@ -627,6 +627,48 @@ int _tsocket_address_unix_from_path(TALLOC_CTX *mem_ctx,
char *tsocket_address_unix_path(const struct tsocket_address *addr,
TALLOC_CTX *mem_ctx);
#ifdef DOXYGEN
/**
* @brief Wrap an existing file descriptors into the tdgram abstraction.
*
* You can use this function to wrap an existing file descriptors into the
* tdgram abstraction. After that you're not able to use this file descriptor
* for anything else. The file descriptor will be closed when the stream gets
* freed. If you still want to use the fd you have have to create a duplicate.
*
* @param[in] mem_ctx The talloc memory context to use.
*
* @param[in] fd The non blocking fd to use!
*
* @param[out] dgram A pointer to store an allocated tdgram_context.
*
* @return 0 on success, -1 on error.
*
* Example:
* @code
* fd2 = dup(fd);
* rc = tdgram_bsd_existing_socket(mem_ctx, fd2, &tdgram);
* if (rc < 0) {
* return;
* }
* @endcode
*
* @warning This is an internal function. You should read the code to fully
* understand it if you plan to use it.
*/
int tdgram_bsd_existing_socket(TALLOC_CTX *mem_ctx,
int fd,
struct tdgram_context **dgram);
#else
int _tdgram_bsd_existing_socket(TALLOC_CTX *mem_ctx,
int fd,
struct tdgram_context **_dgram,
const char *location);
#define tdgram_bsd_existing_socket(mem_ctx, fd, dgram) \
_tdgram_bsd_existing_socket(mem_ctx, fd, dgram, \
__location__)
#endif
/**
* @brief Request a syscall optimization for tdgram_recvfrom_send()
*

24
lib/tsocket/tsocket_bsd.c
View File

@ -1388,6 +1388,30 @@ static int tdgram_bsd_dgram_socket(const struct tsocket_address *local,
return 0;
}
int _tdgram_bsd_existing_socket(TALLOC_CTX *mem_ctx,
int fd,
struct tdgram_context **_dgram,
const char *location)
{
struct tdgram_context *dgram;
struct tdgram_bsd *bsds;
dgram = tdgram_context_create(mem_ctx,
&tdgram_bsd_ops,
&bsds,
struct tdgram_bsd,
location);
if (!dgram) {
return -1;
}
ZERO_STRUCTP(bsds);
bsds->fd = fd;
talloc_set_destructor(bsds, tdgram_bsd_destructor);
*_dgram = dgram;
return 0;
}
int _tdgram_inet_udp_socket(const struct tsocket_address *local,
const struct tsocket_address *remote,
TALLOC_CTX *mem_ctx,