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#include "network_backends.h"
#ifdef USE_WRITEV
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/uio.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <netdb.h>
#include <string.h>
#include <stdlib.h>
#include <limits.h>
#include <stdio.h>
#include "network.h"
#include "fdevent.h"
#include "log.h"
#include "stat_cache.h"
#ifndef UIO_MAXIOV
# if defined(__FreeBSD__) || defined(__APPLE__) || defined(__NetBSD__)
/* FreeBSD 4.7 defines it in sys/uio.h only if _KERNEL is specified */
# define UIO_MAXIOV 1024
# elif defined(__sgi)
/* IRIX 6.5 has sysconf(_SC_IOV_MAX) which might return 512 or bigger */
# define UIO_MAXIOV 512
# elif defined(__sun)
/* Solaris (and SunOS?) defines IOV_MAX instead */
# ifndef IOV_MAX
# define UIO_MAXIOV 16
# else
# define UIO_MAXIOV IOV_MAX
# endif
# elif defined(IOV_MAX)
# define UIO_MAXIOV IOV_MAX
# else
# error UIO_MAXIOV nor IOV_MAX are defined
# endif
#endif
int network_write_chunkqueue_writev(server *srv, connection *con, chunkqueue *cq) {
const int fd = con->fd;
chunk *c;
size_t chunks_written = 0;
for(c = cq->first; c; c = c->next) {
int chunk_finished = 0;
switch(c->type) {
case MEM_CHUNK: {
char * offset;
size_t toSend;
ssize_t r;
size_t num_chunks, i;
struct iovec chunks[UIO_MAXIOV];
chunk *tc;
size_t num_bytes = 0;
/* we can't send more then SSIZE_MAX bytes in one chunk */
/* build writev list
*
* 1. limit: num_chunks < UIO_MAXIOV
* 2. limit: num_bytes < SSIZE_MAX
*/
for(num_chunks = 0, tc = c; tc && tc->type == MEM_CHUNK && num_chunks < UIO_MAXIOV; num_chunks++, tc = tc->next);
for(tc = c, i = 0; i < num_chunks; tc = tc->next, i++) {
if (tc->mem->used == 0) {
chunks[i].iov_base = tc->mem->ptr;
chunks[i].iov_len = 0;
} else {
offset = tc->mem->ptr + tc->offset;
toSend = tc->mem->used - 1 - tc->offset;
chunks[i].iov_base = offset;
/* protect the return value of writev() */
if (toSend > SSIZE_MAX ||
num_bytes + toSend > SSIZE_MAX) {
chunks[i].iov_len = SSIZE_MAX - num_bytes;
num_chunks = i + 1;
break;
} else {
chunks[i].iov_len = toSend;
}
num_bytes += toSend;
}
}
if ((r = writev(fd, chunks, num_chunks)) < 0) {
switch (errno) {
case EAGAIN:
case EINTR:
r = 0;
break;
case EPIPE:
case ECONNRESET:
return -2;
default:
log_error_write(srv, __FILE__, __LINE__, "ssd",
"writev failed:", strerror(errno), fd);
return -1;
}
}
cq->bytes_out += r;
con->bytes_written += r;
/* check which chunks have been written */
for(i = 0, tc = c; i < num_chunks; i++, tc = tc->next) {
if (r >= (ssize_t)chunks[i].iov_len) {
/* written */
r -= chunks[i].iov_len;
tc->offset += chunks[i].iov_len;
if (chunk_finished) {
/* skip the chunks from further touches */
chunks_written++;
c = c->next;
} else {
/* chunks_written + c = c->next is done in the for()*/
chunk_finished++;
}
} else {
/* partially written */
tc->offset += r;
chunk_finished = 0;
break;
}
}
break;
}
case FILE_CHUNK: {
ssize_t r;
off_t offset;
size_t toSend;
stat_cache_entry *sce = NULL;
if (HANDLER_ERROR == stat_cache_get_entry(srv, con, c->file.name, &sce)) {
log_error_write(srv, __FILE__, __LINE__, "sb",
strerror(errno), c->file.name);
return -1;
}
offset = c->file.offset + c->offset;
toSend = c->file.length - c->offset;
if (offset > sce->st.st_size) {
log_error_write(srv, __FILE__, __LINE__, "sb",
"file was shrinked:", c->file.name);
return -1;
}
if (c->file.mmap.start == MAP_FAILED) {
if (-1 == c->file.fd && /* open the file if not already open */
-1 == (c->file.fd = open(c->file.name->ptr, O_RDONLY))) {
log_error_write(srv, __FILE__, __LINE__, "ss", "open failed: ", strerror(errno));
return -1;
}
if (MAP_FAILED == (c->file.mmap.start = mmap(0, sce->st.st_size, PROT_READ, MAP_SHARED, c->file.fd, 0))) {
log_error_write(srv, __FILE__, __LINE__, "ssbd", "mmap failed: ",
strerror(errno), c->file.name, c->file.fd);
return -1;
}
close(c->file.fd);
c->file.fd = -1;
/* chunk_reset() or chunk_free() will cleanup for us */
}
if ((r = write(fd, c->file.mmap.start + offset, toSend)) < 0) {
switch (errno) {
case EAGAIN:
case EINTR:
r = 0;
break;
case EPIPE:
case ECONNRESET:
return -2;
default:
log_error_write(srv, __FILE__, __LINE__, "ssd",
"write failed:", strerror(errno), fd);
return -1;
}
}
c->offset += r;
con->bytes_written += r;
cq->bytes_out += r;
if (c->offset == c->file.length) {
chunk_finished = 1;
}
break;
}
default:
log_error_write(srv, __FILE__, __LINE__, "ds", c, "type not known");
return -1;
}
if (!chunk_finished) {
/* not finished yet */
break;
}
chunks_written++;
}
return chunks_written;
}
#endif
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