shrub/include/v/vere.h

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2013-09-29 00:21:18 +04:00
/* include/v/vere.h
**
** This file is in the public domain.
*/
/** Quasi-tunable parameters.
**/
/* First kernel this executable can boot.
*/
# define FirstKernel 191
# define DefaultKernel 191
#define RECK
/** Data types.
**/
struct _u2_http;
/* u2_hhed: http header.
*/
typedef struct _u2_hhed {
struct _u2_hhed* nex_u;
c3_c* nam_c;
c3_c* val_c;
} u2_hhed;
/* u2_hbod: http body block. Also used for responses.
*/
typedef struct _u2_hbod {
struct _u2_hbod* nex_u;
c3_w len_w;
c3_y hun_y[0];
} u2_hbod;
/* u2_hrat: http parser state.
*/
typedef enum {
u2_hreq_non,
u2_hreq_nam,
u2_hreq_val
} u2_hrat;
/* u2_hmet: http method. Matches jhttp encoding.
*/
typedef enum {
u2_hmet_delete,
u2_hmet_get,
u2_hmet_head,
u2_hmet_post,
u2_hmet_put,
u2_hmet_other // ie, unsupported
} u2_hmet;
/* u2_hreq: incoming http request.
*/
typedef struct _u2_hreq {
struct _u2_hcon* hon_u; // connection
c3_w seq_l; // sequence within connection
u2_hmet met_e; // method
u2_hrat rat_e; // parser state
void* par_u; // struct http_parser *
c3_c* url_c; // url
u2_bean liv; // keepalive
u2_bean end; // all responses added
u2_hhed* hed_u; // headers
u2_hbod* bod_u; // body parts
struct _u2_hreq* nex_u; // next in request queue
u2_hbod* rub_u; // exit of write queue
u2_hbod* bur_u; // entry of write queue
} u2_hreq;
/* u2_hrep: outgoing http response.
*/
typedef struct _u2_hrep {
c3_w coq_l; // connection number
c3_w seq_l; // request number
c3_w sas_w; // status
u2_hhed* hed_u; // headers
u2_hbod* bod_u; // body (one part)
} u2_hrep;
/* u2_hcon: incoming http connection.
*/
typedef struct _u2_hcon {
uv_tcp_t wax_u; // event handler state
c3_w coq_l; // connection number
c3_w seq_l; // next request number
struct _u2_http* htp_u; // backlink to server
struct _u2_hcon* nex_u; // next in server's list
struct _u2_hreq* ruc_u; // request under construction
struct _u2_hreq* req_u; // exit of request queue
struct _u2_hreq* qer_u; // entry of request queue
} u2_hcon;
/* u2_http: http server.
*/
typedef struct _u2_http {
uv_tcp_t wax_u; // event handler state
c3_w sev_l; // server number
c3_w coq_l; // next connection number
c3_w por_w; // running port
struct _u2_hcon* hon_u; // connection list
struct _u2_http* nex_u; // next in list
} u2_http;
/* u2_creq: outgoing http request.
*/
typedef struct _u2_creq { // client request
c3_c* url_c; // url
u2_hmet met_e; // method
u2_hhed* hed_u; // headers
u2_hbod* bod_u; // body
struct _u2_creq* nex_u;
} u2_creq;
/* u2_cres: response to http client.
*/
typedef struct _u2_cres {
u2_hrat rat_e; // parser state
void* par_u; // struct http_parser *
c3_c* url_c; // url
u2_bean end; // all responses added
u2_hhed* hed_u; // headers
u2_hbod* bod_u; // body parts
struct _u2_cres* nex_u; // next in request queue
u2_hbod* rub_u; // exit of write queue
u2_hbod* bur_u; // entry of write queue
} u2_cres;
/* u2_ccon: outgoing http connection.
*/
typedef struct _u2_ccon { // client connection
uv_tcp_t wax_u; // i/o handler state
uv_connect_t cot_u; // connection handler state
c3_w las_w; // last active
c3_w coq_l; // connection number
c3_c* hos_c; // hostname
u2_bean sec; // yes == https
struct _u2_ccon* pre_u; // previous in list
struct _u2_ccon* nex_u; // next in list
} u2_ccon;
/* u2_cttp: http client.
*/
typedef struct _u2_cttp {
struct _u2_ccon* con_u; // connection list
} u2_cttp;
/* u2_apac: ames packet, coming or going.
*/
typedef struct _u2_apac {
struct _u2_apac* nex_u; // next in queue
c3_w pip_w; // IPv4 address, to
c3_s por_s; // IPv4 port, to
c3_w len_w; // length in bytes
c3_y hun_y[0]; // data
} u2_apac;
/* u2_ames: ames networking.
*/
typedef struct _u2_ames { // packet network state
uv_udp_t wax_u; // socket state
uv_timer_t tim_u; // network timer
u2_bean alm; // alarm on
c3_s por_s; // public IPv4 port
c3_w imp_w[256]; // imperial IPs
} u2_ames;
/* u2_save: checkpoint control.
*/
typedef struct _u2_save {
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uv_timer_t tim_u; // checkpoint timer
uv_signal_t sil_u; // child signal
c3_w ent_w; // event number, XX 64
c3_w pid_w; // pid of checkpoint process
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} u2_save;
/* u2_ubuf: unix tty i/o buffer.
*/
typedef struct _u2_ubuf {
struct _u2_ubuf* nex_u;
c3_w len_w;
c3_y hun_y[0]; // bytes to send
} u2_ubuf;
/* u2_utat: unix terminal state.
*/
typedef struct {
struct {
c3_l col_l; // columns
c3_l row_l; // rows
} siz;
struct {
c3_w* lin_w; // current line (utf32)
c3_w len_w; // length of current line
c3_w cus_w; // cursor position
} mir;
struct { // escape code control
u2_bean ape; // escape received
u2_bean bra; // bracket or O received
} esc;
struct {
c3_y syb_y[5]; // utf8 code buffer
c3_w len_w; // present length
c3_w wid_w; // total width
} fut;
} u2_utat;
/* u2_uled: event log header.
*/
typedef struct {
c3_l mag_l; // mug of log format, 'a', 'b'...
c3_w kno_w; // kernel number validated with
c3_l sal_l; // salt for passcode
c3_l key_l; // mug of crypto key, or 0
c3_l sev_l; // host process identity
c3_l tno_l; // terminal count in host
} u2_uled;
/* u2_ular: event log trailer.
*/
typedef struct {
c3_w syn_w; // must equal mug of address
c3_w ent_w; // event sequence number
c3_w len_w; // word length of this event
c3_w mug_w; // mug of noun
} u2_ular;
/* u2_ulog: unix event log.
*/
typedef struct {
c3_i fid_i; // file descriptor
c3_w len_w; // length in words
} u2_ulog;
struct _u2_uhot;
struct _u2_udir;
struct _u2_ufil;
/* u2_unod: file or directory.
*/
typedef struct _u2_unod {
uv_fs_event_t was_u; // stat watcher
u2_bean dir; // always
u2_bean dry; // ie, unmodified
c3_c* pax_c; // absolute path
struct _u2_udir* par_u; // in directory
} u2_unod;
/* u2_ufil: synchronized file.
*/
typedef struct _u2_ufil {
uv_fs_event_t was_u; // stat watcher
u2_bean non; // always u2_no
u2_bean dry; // ie, unmodified
c3_c* pax_c; // absolute path
struct _u2_udir* par_u; // in directory
c3_c* dot_c; // extension point or 0
mpz_t mod_mp; // mtime as @da
struct _u2_ufil* nex_u; // internal list
} u2_ufil;
/* u2_udir: synchronized directory.
*/
typedef struct _u2_udir {
uv_fs_event_t was_u; // stat watcher
u2_bean yes; // always u2_yes
u2_bean dry; // ie, unmodified
c3_c* pax_c; // absolute path
struct _u2_udir* par_u; // parent directory
struct _u2_udir* dis_u; // subdirectories
struct _u2_ufil* fil_u; // files
struct _u2_udir* nex_u; // internal list
} u2_udir;
/* u2_uhot: synchronized host.
*/
typedef struct _u2_uhot {
u2_udir dir_u; // root directory
mpz_t who_mp; // owner as GMP
struct _u2_uhot* nex_u; // internal list
} u2_uhot;
/* u2_usig: receive signals.
*/
typedef struct _u2_usig {
uv_signal_t sil_u;
c3_i num_i;
struct _u2_usig* nex_u;
} u2_usig;
/* u2_unix: clay support system, also
*/
typedef struct _u2_unix {
uv_timer_t tim_u; // clay timer
u2_bean alm; // alarm
u2_uhot* hot_u; // host state
u2_usig* sig_u; // signal list
} u2_unix;
/* u2_batz: just a timer for now
*/
typedef struct _u2_batz {
uv_timer_t tim_u; // clay timer
u2_bean alm; // alarm
} u2_batz;
/* u2_utfo: unix terminfo strings.
*/
typedef struct {
struct {
const c3_y* kcuu1_y; // key_up
const c3_y* kcud1_y; // key_down
const c3_y* kcub1_y; // key_back
const c3_y* kcuf1_y; // key_forward
c3_w max_w; // maximum input sequence length
} inn;
struct {
const c3_y* clear_y; // clear_screen
const c3_y* el_y; // clr_bol clear to beginning
// const c3_y* el1_y; // clr_eol clear to end
const c3_y* ed_y; // clear to end of screen
const c3_y* bel_y; // bel sound bell
const c3_y* cub1_y; // parm_left
const c3_y* cuf1_y; // parm_right
const c3_y* cuu1_y; // parm_up
const c3_y* cud1_y; // parm_down
// const c3_y* cub_y; // parm_left_cursor #num
// const c3_y* cuf_y; // parm_right_cursor #num
} out;
} u2_utfo;
#if 0
/* u2_uwen: unix alarm.
*/
typedef struct _u2_uwen {
c3_y* pax_y; // printed path
c3_d wen_d[2]; // timer expire
};
/* u2_utim: unix timer control.
*/
typedef struct _u2_utim {
uv_timer_t wat_u; // libev timer control
u2_uwen* wen_u; // timers in ascending order
};
#endif
/* u2_utty: unix tty.
*/
typedef struct _u2_utty {
#if 0
uv_tty_t wax_u; // event handler state
#else
uv_poll_t wax_u;
#endif
struct termios bak_u; // cooked terminal state
struct termios raw_u; // raw terminal state
c3_i fid_i; // file descriptor
# if 1
c3_i cug_i; // blocking fcntl flags
c3_i nob_i; // nonblocking fcntl flags
# endif
c3_w tid_l; // terminal identity number
u2_utfo ufo_u; // terminfo strings
# if 1
u2_ubuf* tou_u; // entry of output queue
u2_ubuf* out_u; // exit of output queue
# endif
u2_utat tat_u; // control state
struct _u2_utty* nex_u; // next in host list
} u2_utty;
/* u2_opts:
*/
typedef struct _u2_opts {
c3_c* cpu_c;
c3_c* imp_c;
c3_c* hom_c;
c3_w kno_w;
c3_w fuz_w;
u2_bean abo;
u2_bean gab;
u2_bean dem;
u2_bean loh;
u2_bean pro;
u2_bean veb;
u2_bean pas;
u2_bean rez;
u2_bean sow;
u2_bean nuu;
} u2_opts;
/* u2_host: entire host.
*/
typedef struct _u2_host {
u2_wire wir_r; // noun system, 1 per thread
c3_w kno_w; // current executing stage
c3_c* cpu_c; // computer path
c3_d now_d; // event tick
uv_loop_t* lup_u; // libuv event loop
u2_http* htp_u; // http servers
u2_utty* uty_u; // all terminals
u2_utty* tem_u; // main terminal (1)
u2_ulog lug_u; // event log
u2_ames sam_u; // packet interface
u2_save sav_u; // autosave
u2_opts ops_u; // commandline options
u2_unix unx_u; // sync and clay
u2_batz beh_u; // batz timer
u2_bean liv; // if u2_no, shut down
u2_reck* arv_u; // runtime
} u2_host; // host == computer == process
# define u2L u2_Host.lup_u // global event loop
/* u2_funk: standard system function.
*/
typedef u2_noun (*u2_funk)(u2_reck* rec_u, u2_noun);
/** Global variables.
**/
c3_global u2_host u2_Host;
c3_global u2_wire u2_Wire;
c3_global c3_c* u2_Local;
c3_global c3_c* u2_System;
c3_global u2_bean u2_Flag_Abort;
c3_global u2_bean u2_Flag_Garbage;
c3_global u2_bean u2_Flag_Profile;
c3_global u2_bean u2_Flag_Verbose;
# define u2_ve_at() ( &u2_Host.ver_e[u2_Host.kno_w] )
/** Functions.
**/
/* Urbit time: 128 bits, leap-free.
**
** High 64 bits: 0x8000.000c.cea3.5380 + Unix time at leap 25 (Jul 2012)
** Low 64 bits: 1/2^64 of a second.
**
** Seconds per Gregorian 400-block: 12.622.780.800
** 400-blocks from 0 to 0AD: 730.692.561
** Years from 0 to 0AD: 292.277.024.400
** Seconds from 0 to 0AD: 9.223.372.029.693.628.800
** Seconds between 0A and Unix epoch: 62.167.219.200
** Seconds before Unix epoch: 9.223.372.091.860.848.000
** The same, in C hex notation: 0x8000000cce9e0d80ULL
**
** New leap seconds after July 2012 (leap second 25) are ignored. The
** platform OS will not ignore them, of course, so they must be detected
** and counteracted. Perhaps this phenomenon will soon find an endpoint.
*/
/* u2_time_sec_in(): urbit seconds from unix time.
**
** Adjust (externally) for future leap secs!
*/
c3_d
u2_time_sec_in(c3_w unx_w);
/* u2_time_sec_out(): unix time from urbit seconds.
**
** Adjust (externally) for future leap secs!
*/
c3_w
u2_time_sec_out(c3_d urs_d);
/* u2_time_fsc_in(): urbit fracto-seconds from unix microseconds.
*/
c3_d
u2_time_fsc_in(c3_w usc_w);
/* u2_time_fsc_out: unix microseconds from urbit fracto-seconds.
*/
c3_w
u2_time_fsc_out(c3_d ufc_d);
/* u2_time_in_tv(): urbit time from struct timeval.
*/
u2_atom
u2_time_in_tv(struct timeval* tim_tv);
/* u2_time_out_tv(): struct timeval from urbit time.
*/
void
u2_time_out_tv(struct timeval* tim_tv, u2_noun now);
/* u2_time_in_ts(): urbit time from struct timespec.
*/
u2_atom
u2_time_in_ts(struct timespec* tim_ts);
#if defined(U2_OS_linux)
/* u2_time_t_in_ts(): urbit time from time_t.
*/
u2_atom
u2_time_t_in_ts(time_t tim);
#endif
/* u2_time_out_ts(): struct timespec from urbit time.
*/
void
u2_time_out_ts(struct timespec* tim_ts, u2_noun now);
/* u2_time_gap_ms(): (wen - now) in ms.
*/
c3_d
u2_time_gap_ms(u2_noun now, u2_noun wen);
/** Filesystem (new api).
**/
/* u2_walk_load(): load file or bail.
*/
u2_noun
u2_walk_load(c3_c* pas_c);
/* u2_walk_safe(): load file or 0.
*/
u2_noun
u2_walk_safe(c3_c* pas_c);
/* u2_walk_save(): save file or bail.
*/
void
u2_walk_save(c3_c* pas_c, u2_noun tim, u2_atom pad);
/* u2_sync_reck(): traverse filesystem for changes -> lamb
*/
u2_noun
u2_sync_reck(u2_reck* rec_u);
/* u2_walk(): traverse `dir_c` to produce an arch, updating `old`.
*/
u2_noun
u2_walk(u2_reck* rec_u, const c3_c* dir_c, u2_noun old);
/* u2_path(): C unix path in computer for file or directory.
*/
c3_c*
u2_path(u2_bean fyl, u2_noun pax);
/** Filesystem (old api).
**/
/* u2_ve_file(): load internal file as atom from local or system.
*/
u2_weak
u2_ve_file(c3_c* ext_c, u2_noun tah);
/* u2_ve_frep(): load [.~ %rep myp {now} tah].
**
** File is either ~ or [nbytes mdate atom].
*/
u2_noun
u2_ve_frep(u2_noun myp, u2_noun tah);
/* u2_ve_date(): date internal file.
*/
c3_d
u2_ve_date(c3_c* ext_c, u2_noun tah);
/* u2_ve_save(): save internal file as atom.
*/
u2_bean
u2_ve_save(c3_c* ext_c, u2_noun tah, u2_noun dat);
/* u2_ve_zeus(): prayer to internal file path. Return unit.
*/
u2_noun
u2_ve_zeus(u2_noun hap);
/** Output.
**/
/* u2_ve_tank(): print a tank at `tab`.
*/
void
u2_ve_tank(c3_l tab_l, u2_noun tac);
/** Kernel control.
**/
/* u2_reck_do(): use a kernel function.
*/
# define u2_do(t, a) u2_reck_do(t, a)
# define u2_dc(t, a1, a2) u2_reck_do(t, u2nc(a1, a2))
# define u2_dt(t, a1, a2, a3) u2_reck_do(t, u2nt(a1, a2, a3))
# define u2_dq(t, a1, a2, a3, a4) u2_reck_do(t, u2nq(a1, a2, a3, a4))
u2_noun
u2_reck_do(const c3_c* txt_c, u2_noun arg);
/* u2_reck_line(): apply a reck line (protected).
*/
void
u2_reck_line(u2_reck* rec_u, u2_noun lin);
/* u2_reck_numb(): set the instance number.
*/
void
u2_reck_numb(u2_reck* rec_u);
/* u2_reck_http_request(): hear http request on channel.
*/
void
u2_reck_http_request(u2_reck* rec_u,
u2_bean sec,
u2_noun pox,
u2_noun req);
/* u2_reck_http_respond(): apply http response.
*/
void
u2_reck_http_respond(u2_reck* rec_u, u2_noun pox, u2_noun rep);
/* u2_reck_boot(): boot the reck engine (unprotected).
*/
void
u2_reck_boot(u2_reck* rec_u);
/* u2_reck_launch(): launch the reck engine (unprotected).
*/
u2_bean
u2_reck_launch(u2_reck* rec_u);
/* u2_reck_peek(): query the reck namespace (protected).
*/
u2_noun
u2_reck_peek(u2_reck* rec_u, u2_noun our, u2_noun hap);
/* u2_reck_keep(): measure timer.
*/
u2_noun
u2_reck_keep(u2_reck* rec_u, u2_noun hap);
/* u2_reck_poke(): insert and apply an input ovum (protected).
*/
u2_noun
u2_reck_poke(u2_reck* rec_u, u2_noun ovo);
/* u2_reck_prick(): query the reck namespace (unprotected).
*/
u2_noun
u2_reck_prick(u2_reck* rec_u, u2_noun our, u2_noun hap);
/* u2_reck_kick(): handle effect.
*/
void
u2_reck_kick(u2_reck* rec_u, u2_noun ovo);
/* u2_reck_sync(): poll and apply sync events (protected).
*/
void
u2_reck_sync(u2_reck* rec_u);
/* u2_reck_time(): set the reck time.
*/
void
u2_reck_time(u2_reck* rec_u);
/* u2_reck_wind(): set the reck time artificially.
*/
void
u2_reck_wind(u2_reck* rec_u, u2_noun now);
/* u2_reck_plan(): queue ovum (external).
*/
void
u2_reck_plan(u2_reck* rec_u,
u2_noun pax,
u2_noun fav);
/* u2_reck_plow(): queue ovum list in order (external).
*/
void
u2_reck_plow(u2_reck* rec_u, u2_noun ova);
/* u2_reck_work(): flush ova (unprotected).
*/
void
u2_reck_work(u2_reck* rec_u);
/** Main loop, new style.
**/
/* u2_lo_loop(): enter main event loop.
*/
void
u2_lo_loop(u2_reck* rec_u);
/* u2_lo_show(): print typeless noun.
*/
void
u2_lo_show(c3_c* cap_c, u2_noun nun);
#define u2ls(cap_c, nun) u2_lo_show(cap_c, nun)
/* u2_lo_bail(): clean up all event state.
*/
void
u2_lo_bail(u2_reck* rec_u);
/* u2_lo_tank(): dump single tank.
*/
void
u2_lo_tank(c3_l tab_l, u2_noun tac);
/* u2_lo_punt(): dump tank list.
*/
void
u2_lo_punt(c3_l tab_l, u2_noun tac);
/* u2_lo_sway(): print trace.
*/
void
u2_lo_sway(c3_l tab_l, u2_noun tax);
/* u2_lo_grab(): garbage-collect the world, plus roots.
*/
void
u2_lo_grab(u2_noun som, ...);
/* u2_lo_open(): begin callback processing.
*/
void
u2_lo_open(void);
/* u2_lo_shut(): end callback processing.
*/
void
u2_lo_shut(u2_bean);
/** Terminal, new style.
**/
/* u2_term_get_blew(): return window size [columns rows].
*/
u2_noun
u2_term_get_blew(c3_l tid_l);
/* u2_term_ef_boil(): initial effects for restored server.
*/
void
u2_term_ef_boil(c3_l ono_l);
/* u2_term_ef_winc(): window change.
*/
void
u2_term_ef_winc(void);
/* u2_term_ef_ctlc(): send ^C.
*/
void
u2_term_ef_ctlc(void);
/* u2_term_ef_bake(): initial effects for new server.
*/
void
u2_term_ef_bake(u2_noun fav);
/* u2_term_ef_blit(): send %blit effect to to terminal.
*/
void
u2_term_ef_blit(c3_l tid_l,
u2_noun blt);
/* u2_term_io_init(): initialize terminal I/O.
*/
void
u2_term_io_init(void);
/* u2_term_io_exit(): terminate terminal I/O.
*/
void
u2_term_io_exit(void);
/* u2_term_io_poll(): update terminal IO state.
*/
void
u2_term_io_poll(void);
/* u2_term_io_hija(): hijack console for cooked print.
*/
FILE*
u2_term_io_hija(void);
/* u2_term_io_loja(): release console from cooked print.
*/
void
u2_term_io_loja(int x);
/* uL, uH: wrap hijack/lojack around fprintf.
**
** uL(fprintf(uH, ...));
*/
# define uH u2_term_io_hija()
# define uL(x) u2_term_io_loja(x)
/** Ames, packet networking.
**/
/* u2_ames_ef_send(): send packet to network.
*/
void
u2_ames_ef_send(u2_noun lan,
u2_noun pac);
/* u2_ames_io_init(): initialize ames I/O.
*/
void
u2_ames_io_init(void);
/* u2_ames_io_exit(): terminate ames I/O.
*/
void
u2_ames_io_exit(void);
/* u2_ames_io_poll(): update ames IO state.
*/
void
u2_ames_io_poll(void);
/** Autosave.
**/
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/* u2_save_ef_chld(): report SIGCHLD.
*/
void
u2_save_ef_chld(void);
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/* u2_save_io_init(): initialize autosave.
*/
void
u2_save_io_init(void);
/* u2_save_io_exit(): terminate autosave.
*/
void
u2_save_io_exit(void);
/* u2_save_io_poll(): update autosave state.
*/
void
u2_save_io_poll(void);
/** Storage, new school.
**/
/* u2_unix_ef_hold():
*/
void
u2_unix_ef_hold();
/* u2_unix_ef_move():
*/
void
u2_unix_ef_move();
/* u2_unix_ef_look(): update filesystem, inbound.
*/
void
u2_unix_ef_look(void);
/* u2_unix_ef_init(): update filesystem for new acquisition.
*/
void
u2_unix_ef_init(u2_noun who);
/* u2_unix_ef_ergo(): update filesystem, outbound.
*/
void
u2_unix_ef_ergo(u2_noun who,
u2_noun syd,
u2_noun rel);
/* u2_unix_io_init(): initialize storage.
*/
void
u2_unix_io_init(void);
/* u2_unix_io_exit(): terminate storage.
*/
void
u2_unix_io_exit(void);
/* u2_unix_io_poll(): update storage state.
*/
void
u2_unix_io_poll(void);
/** Behn, just a timer.
**/
/* u2_batz_io_init(): initialize batz timer.
*/
void
u2_batz_io_init(void);
/* u2_batz_io_exit(): terminate timer.
*/
void
u2_batz_io_exit(void);
/* u2_batz_io_poll(): update batz IO state.
*/
void
u2_batz_io_poll(void);
/** HTTP, new style.
**/
/* u2_http_ef_thou(): send %thou effect to http.
*/
void
u2_http_ef_thou(c3_l coq_l,
c3_l seq_l,
u2_noun rep);
/* u2_http_ef_bake(): create new http server.
*/
void
u2_http_ef_bake(void);
/* u2_http_io_init(): initialize http I/O.
*/
void
u2_http_io_init(void);
/* u2_http_io_exit(): terminate http I/O.
*/
void
u2_http_io_exit(void);
/* u2_http_io_poll(): update http IO state.
*/
void
u2_http_io_poll(void);