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#include "uwsgi.h"
extern struct uwsgi_server uwsgi;
// sendfile() abstraction
ssize_t uwsgi_sendfile_do(int sockfd, int filefd, size_t pos, size_t len) {
// for platform not supporting sendfile we need to rely on boring read/write
// generally that platforms have very low memory, so use a 8k buffer
char buf[8192];
if (uwsgi.disable_sendfile) goto no_sendfile;
#if defined(__FreeBSD__) || defined(__DragonFly__)
off_t sf_len = len;
int sf_ret = sendfile(filefd, sockfd, pos, len, NULL, &sf_len, 0);
if (sf_ret == 0 || (sf_ret == -1 && errno == EAGAIN)) return sf_len;
return -1;
#elif defined(__APPLE__) && !defined(NO_SENDFILE)
off_t sf_len = len;
int sf_ret = sendfile(filefd, sockfd, pos, &sf_len, NULL, 0);
if (sf_ret == 0 || (sf_ret == -1 && errno == EAGAIN)) return sf_len;
return -1;
#elif defined(__linux__) || defined(__GNU_kFreeBSD__)
off_t off = pos;
return sendfile(sockfd, filefd, &off, len);
#elif defined(__sun__)
off_t off = pos;
ssize_t wlen = sendfile(sockfd, filefd, &off, len);
if (wlen < 0 && uwsgi_is_again()) {
if (off - pos > 0) {
return off-pos;
}
}
return wlen;
#endif
no_sendfile:
if (pos > 0) {
if (lseek(filefd, pos, SEEK_SET) < 0) {
uwsgi_error("uwsgi_sendfile_do()/seek()");
return -1;
}
}
ssize_t rlen = read(filefd, buf, UMIN(len, 8192));
if (rlen <= 0) {
uwsgi_error("uwsgi_sendfile_do()/read()");
return -1;
}
return write(sockfd, buf, rlen);
}
/*
simple non blocking sendfile implementation
(generally used as fallback)
*/
int uwsgi_simple_sendfile(struct wsgi_request *wsgi_req, int fd, size_t pos, size_t len) {
wsgi_req->write_pos = 0;
for(;;) {
int ret = wsgi_req->socket->proto_sendfile(wsgi_req, fd, pos, len);
if (ret < 0) {
if (!uwsgi.ignore_write_errors) {
uwsgi_error("uwsgi_simple_sendfile()");
}
wsgi_req->write_errors++;
return -1;
}
if (ret == UWSGI_OK) {
break;
}
ret = uwsgi_wait_write_req(wsgi_req);
if (ret < 0) {
wsgi_req->write_errors++;
return -1;
}
if (ret == 0) {
uwsgi_log("uwsgi_simple_sendfile() TIMEOUT !!!\n");
wsgi_req->write_errors++;
return -1;
}
}
return 0;
}
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