#ifndef _NGX_OS_H_INCLUDED_
#define _NGX_OS_H_INCLUDED_
#include <ngx_config.h>
#include <ngx_core.h>
#define NGX_IO_SENDFILE 1
typedef ssize_t (*ngx_recv_pt)(ngx_connection_t *c, u_char *buf, size_t size);
typedef ssize_t (*ngx_recv_chain_pt)(ngx_connection_t *c, ngx_chain_t *in,
off_t limit);
typedef ssize_t (*ngx_send_pt)(ngx_connection_t *c, u_char *buf, size_t size);
typedef ngx_chain_t *(*ngx_send_chain_pt)(ngx_connection_t *c, ngx_chain_t *in,
off_t limit);
typedef struct {
ngx_recv_pt recv;
ngx_recv_chain_pt recv_chain;
ngx_recv_pt udp_recv;
ngx_send_pt send;
ngx_send_chain_pt send_chain;
ngx_uint_t flags;
} ngx_os_io_t;
ngx_int_t ngx_os_init(ngx_log_t *log);
void ngx_os_status(ngx_log_t *log);
ngx_int_t ngx_os_specific_init(ngx_log_t *log);
void ngx_os_specific_status(ngx_log_t *log);
ngx_int_t ngx_daemon(ngx_log_t *log);
ngx_int_t ngx_os_signal_process(ngx_cycle_t *cycle, char *sig, ngx_int_t pid);
ssize_t ngx_unix_recv(ngx_connection_t *c, u_char *buf, size_t size);
ssize_t ngx_readv_chain(ngx_connection_t *c, ngx_chain_t *entry, off_t limit);
ssize_t ngx_udp_unix_recv(ngx_connection_t *c, u_char *buf, size_t size);
ssize_t ngx_unix_send(ngx_connection_t *c, u_char *buf, size_t size);
ngx_chain_t *ngx_writev_chain(ngx_connection_t *c, ngx_chain_t *in,
off_t limit);
#if (IOV_MAX > 64)
#define NGX_IOVS_PREALLOCATE 64
#else
#define NGX_IOVS_PREALLOCATE IOV_MAX
#endif
typedef struct {
struct iovec *iovs;
ngx_uint_t count;
size_t size;
ngx_uint_t nalloc;
} ngx_iovec_t;
ngx_chain_t *ngx_output_chain_to_iovec(ngx_iovec_t *vec, ngx_chain_t *in,
size_t limit, ngx_log_t *log);
ssize_t ngx_writev(ngx_connection_t *c, ngx_iovec_t *vec);
extern ngx_os_io_t ngx_os_io;
extern ngx_int_t ngx_ncpu;
extern ngx_int_t ngx_max_sockets;
extern ngx_uint_t ngx_inherited_nonblocking;
extern ngx_uint_t ngx_tcp_nodelay_and_tcp_nopush;
#if (NGX_FREEBSD)
#include <ngx_freebsd.h>
#elif (NGX_LINUX)
#include <ngx_linux.h>
#elif (NGX_SOLARIS)
#include <ngx_solaris.h>
#elif (NGX_DARWIN)
#include <ngx_darwin.h>
#endif
#endif