lighttpd 1.4.x https://www.lighttpd.net/
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#ifndef _CHUNK_H_
#define _CHUNK_H_
#include "first.h"
#ifdef _AIX /*(AIX might #define mmap mmap64)*/
#include "sys-mmap.h"
#endif
#include "buffer.h"
#include "array.h"
typedef struct chunk {
struct chunk *next;
fix buffer, chunk and http_chunk API * remove unused structs and functions (buffer_array, read_buffer) * change return type from int to void for many functions, as the return value (indicating error/success) was never checked, and the function would only fail on programming errors and not on invalid input; changed functions to use force_assert instead of returning an error. * all "len" parameters now are the real size of the memory to be read. the length of strings is given always without the terminating 0. * the "buffer" struct still counts the terminating 0 in ->used, provide buffer_string_length() to get the length of a string in a buffer. unset config "strings" have used == 0, which is used in some places to distinguish unset values from "" (empty string) values. * most buffer usages should now use it as string container. * optimise some buffer copying by "moving" data to other buffers * use (u)intmax_t for generic int-to-string functions * remove unused enum values: UNUSED_CHUNK, ENCODING_UNSET * converted BUFFER_APPEND_SLASH to inline function (no macro feature needed) * refactor: create chunkqueue_steal: moving (partial) chunks into another queue * http_chunk: added separate function to terminate chunked body instead of magic handling in http_chunk_append_mem(). http_chunk_append_* now handle empty chunks, and never terminate the chunked body. From: Stefan Bühler <stbuehler@web.de> git-svn-id: svn://svn.lighttpd.net/lighttpd/branches/lighttpd-1.4.x@2975 152afb58-edef-0310-8abb-c4023f1b3aa9
7 years ago
enum { MEM_CHUNK, FILE_CHUNK } type;
buffer *mem; /* either the storage of the mem-chunk or the name of the file */
/* the size of the chunk is either:
* - mem-chunk: buffer_string_length(chunk::mem)
* - file-chunk: chunk::file.length
*/
off_t offset; /* octets sent from this chunk */
struct {
/* filechunk */
off_t start; /* starting offset in the file */
off_t length; /* octets to send from the starting offset */
int fd;
int is_temp; /* file is temporary and will be deleted if on cleanup */
struct {
char *start; /* the start pointer of the mmap'ed area */
size_t length; /* size of the mmap'ed area */
off_t offset; /* start is <n> octet away from the start of the file */
} mmap;
} file;
} chunk;
typedef struct {
chunk *first;
chunk *last;
off_t bytes_in, bytes_out;
array *tempdirs;
off_t upload_temp_file_size;
unsigned int tempdir_idx;
} chunkqueue;
buffer * chunk_buffer_acquire(void);
void chunk_buffer_release(buffer *b);
void chunkqueue_chunk_pool_clear(void);
void chunkqueue_chunk_pool_free(void);
chunkqueue *chunkqueue_init(void);
void chunkqueue_set_chunk_size (size_t sz);
void chunkqueue_set_tempdirs_default_reset (void);
void chunkqueue_set_tempdirs_default (array *tempdirs, off_t upload_temp_file_size);
void chunkqueue_set_tempdirs(chunkqueue *cq, array *tempdirs, off_t upload_temp_file_size);
void chunkqueue_append_file(chunkqueue *cq, buffer *fn, off_t offset, off_t len); /* copies "fn" */
[core] open fd when appending file to cq (fixes #2655) http_chunk_append_file() opens fd when appending file to chunkqueue. Defers calculation of content length until response is finished. This reduces race conditions pertaining to stat() and then (later) open(), when the result of the stat() was used for Content-Length or to generate chunked headers. Note: this does not change how lighttpd handles files that are modified in-place by another process after having been opened by lighttpd -- don&#39;t do that. This *does* improve handling of files that are frequently modified via a temporary file and then atomically renamed into place. mod_fastcgi has been modified to use http_chunk_append_file_range() with X-Sendfile2 and will open the target file multiple times if there are multiple ranges. Note: (future todo) not implemented for chunk.[ch] interfaces used by range requests in mod_staticfile or by mod_ssi. Those uses could lead to too many open fds. For mod_staticfile, limits should be put in place for max number of ranges accepted by mod_staticfile. For mod_ssi, limits would need to be placed on the maximum number of includes, and the primary SSI file split across lots of SSI directives should either copy the pieces or perhaps chunk.h could be extended to allow for an open fd to be shared across multiple chunks. Doing either of these would improve the performance of SSI since they would replace many file opens on the pieces of the SSI file around the SSI directives. x-ref: &#34;Serving a file that is getting updated can cause an empty response or incorrect content-length error&#34; https://redmine.lighttpd.net/issues/2655 github: Closes #49
6 years ago
void chunkqueue_append_file_fd(chunkqueue *cq, buffer *fn, int fd, off_t offset, off_t len); /* copies "fn" */
void chunkqueue_append_mem(chunkqueue *cq, const char *mem, size_t len); /* copies memory */
void chunkqueue_append_mem_min(chunkqueue *cq, const char * mem, size_t len); /* copies memory */
void chunkqueue_append_buffer(chunkqueue *cq, buffer *mem); /* may reset "mem" */
void chunkqueue_append_chunkqueue(chunkqueue *cq, chunkqueue *src);
buffer * chunkqueue_prepend_buffer_open_sz(chunkqueue *cq, size_t sz);
buffer * chunkqueue_prepend_buffer_open(chunkqueue *cq);
void chunkqueue_prepend_buffer_commit(chunkqueue *cq);
buffer * chunkqueue_append_buffer_open_sz(chunkqueue *cq, size_t sz);
buffer * chunkqueue_append_buffer_open(chunkqueue *cq);
void chunkqueue_append_buffer_commit(chunkqueue *cq);
struct server; /*(declaration)*/
int chunkqueue_append_mem_to_tempfile(struct server *srv, chunkqueue *cq, const char *mem, size_t len);
/* functions to handle buffers to read into: */
/* obtain/reserve memory in chunkqueue at least len (input) size,
* return pointer to memory with len (output) available for use
* modifying the chunkqueue invalidates the memory area.
* should always be followed by chunkqueue_get_memory(),
* even if nothing was read.
* pass 0 in len for mem at least half of chunk_buf_sz
*/
char * chunkqueue_get_memory(chunkqueue *cq, size_t *len);
/* commit len bytes of mem obtained from chunkqueue_get_memory() */
void chunkqueue_use_memory(chunkqueue *cq, size_t len);
/* mark first "len" bytes as written (incrementing chunk offsets)
* and remove finished chunks
*/
void chunkqueue_mark_written(chunkqueue *cq, off_t len);
fix buffer, chunk and http_chunk API * remove unused structs and functions (buffer_array, read_buffer) * change return type from int to void for many functions, as the return value (indicating error/success) was never checked, and the function would only fail on programming errors and not on invalid input; changed functions to use force_assert instead of returning an error. * all &#34;len&#34; parameters now are the real size of the memory to be read. the length of strings is given always without the terminating 0. * the &#34;buffer&#34; struct still counts the terminating 0 in -&gt;used, provide buffer_string_length() to get the length of a string in a buffer. unset config &#34;strings&#34; have used == 0, which is used in some places to distinguish unset values from &#34;&#34; (empty string) values. * most buffer usages should now use it as string container. * optimise some buffer copying by &#34;moving&#34; data to other buffers * use (u)intmax_t for generic int-to-string functions * remove unused enum values: UNUSED_CHUNK, ENCODING_UNSET * converted BUFFER_APPEND_SLASH to inline function (no macro feature needed) * refactor: create chunkqueue_steal: moving (partial) chunks into another queue * http_chunk: added separate function to terminate chunked body instead of magic handling in http_chunk_append_mem(). http_chunk_append_* now handle empty chunks, and never terminate the chunked body. From: Stefan Bühler &lt;stbuehler@web.de&gt; git-svn-id: svn://svn.lighttpd.net/lighttpd/branches/lighttpd-1.4.x@2975 152afb58-edef-0310-8abb-c4023f1b3aa9
7 years ago
void chunkqueue_remove_finished_chunks(chunkqueue *cq);
void chunkqueue_steal(chunkqueue *dest, chunkqueue *src, off_t len);
struct server;
int chunkqueue_steal_with_tempfiles(struct server *srv, chunkqueue *dest, chunkqueue *src, off_t len);
int chunkqueue_open_file_chunk(struct server *srv, chunkqueue *cq);
off_t chunkqueue_length(chunkqueue *cq);
void chunkqueue_free(chunkqueue *cq);
void chunkqueue_reset(chunkqueue *cq);
static inline int chunkqueue_is_empty(const chunkqueue *cq);
static inline int chunkqueue_is_empty(const chunkqueue *cq) {
return NULL == cq->first;
}
#endif