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lighttpd2/src/network_writev.c

105 lines
2.9 KiB

#include "network.h"
#include <sys/uio.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
network_status_t network_backend_writev(server *srv, connection *con, int fd, chunkqueue *cq) {
const off_t max_write = 256 * 1024; /* 256k */
off_t min_cq_len, max_chunks_len, we_have;
ssize_t r;
gboolean did_write_something = FALSE;
chunkiter ci;
chunk *c;
GArray *chunks = g_array_sized_new(FALSE, TRUE, sizeof(struct iovec), UIO_MAXIOV);
/* stop if chunkqueue length gets less or equal than min_cq_len */
min_cq_len = cq->length - max_write;
if (min_cq_len < 0) min_cq_len = 0;
do {
if (0 == cq->length) return NETWORK_STATUS_SUCCESS;
ci = chunkqueue_iter(cq);
if (MEM_CHUNK != (c = chunkiter_chunk(ci))->type) {
NETWORK_FALLBACK(network_backend_write);
did_write_something = TRUE;
continue;
}
max_chunks_len = cq->length - min_cq_len;
we_have = 0;
do {
guint i = chunks->len;
off_t len = c->mem->len - c->offset;
struct iovec *v;
g_array_set_size(chunks, i + 1);
v = &g_array_index(chunks, struct iovec, i);
v->iov_base = c->mem->str + c->offset;
if (len > max_write) len = max_write;
v->iov_len = len;
we_have += len;
} while (we_have < max_chunks_len &&
chunkiter_next(&ci) &&
MEM_CHUNK == (c = chunkiter_chunk(ci))->type &&
chunks->len < UIO_MAXIOV);
while (-1 == (r = writev(fd, (struct iovec*) chunks->data, chunks->len))) {
switch (errno) {
case EAGAIN:
#if EWOULDBLOCK != EAGAIN
case EWOULDBLOCK
#endif
g_array_free(chunks, TRUE);
return did_write_something ? NETWORK_STATUS_SUCCESS : NETWORK_STATUS_WAIT_FOR_EVENT;
case ECONNRESET:
case EPIPE:
g_array_free(chunks, TRUE);
return NETWORK_STATUS_CONNECTION_CLOSE;
case EINTR:
break; /* try again */
default:
g_array_free(chunks, TRUE);
CON_ERROR(srv, con, "oops, write to fd=%d failed: %s (%d)", fd, strerror(errno), errno );
return NETWORK_STATUS_FATAL_ERROR;
}
}
if (0 == r) {
g_array_free(chunks, TRUE);
return did_write_something ? NETWORK_STATUS_SUCCESS : NETWORK_STATUS_WAIT_FOR_EVENT;
}
chunkqueue_skip(cq, r);
if (r != we_have) {
g_array_free(chunks, TRUE);
return NETWORK_STATUS_SUCCESS;
}
did_write_something = TRUE;
g_array_set_size(chunks, 0);
} while (cq->length > min_cq_len);
g_array_free(chunks, TRUE);
return NETWORK_STATUS_SUCCESS;
}