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socat/xio.h
Gerhard Rieger 9e02161f73 socat V2.0.0-b1
2008-02-24 11:09:01 +01:00

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/* $Id: xio.h,v 1.66 2007/03/06 21:25:51 gerhard Exp $ */
/* Copyright Gerhard Rieger 2001-2007 */
/* Published under the GNU General Public License V.2, see file COPYING */
#ifndef __xio_h_included
#define __xio_h_included 1
#if 1 /*!*/
#include "mytypes.h"
#include "sysutils.h"
#endif
#define XIO_MAXSOCK 2
/* Linux 2.2.10 */
#define HAVE_STRUCT_LINGER 1
#define LINETERM_RAW 0
#define LINETERM_CR 1
#define LINETERM_CRNL 2
union xioaddr_desc;
struct opt;
/* the flags argument of xioopen */
#define XIO_RDONLY O_RDONLY /* asserted to be 0 */
#define XIO_WRONLY O_WRONLY /* asserted to be 1 */
#define XIO_RDWR O_RDWR /* asserted to be 2 */
#define XIO_ACCMODE O_ACCMODE /* must be 3 */
/* 3 is undefined */
#define XIO_MAYFORK 4 /* address is allowed to fork the program (fork),
especially with listen and connect addresses */
#define XIO_MAYCHILD 8 /* address is allowed to fork off a child that
exec's another program or calls system() */
#define XIO_MAYEXEC 16 /* address is allowed to exec a prog (exec+nofork) */
#define XIO_MAYCONVERT 32 /* address is allowed to perform modifications on the
stream data, e.g. SSL, READLINE; CRLF */
#define XIO_MAYCHAIN 64 /* address is allowed to consist of a chain of
subaddresses that are handled by socat
subprocesses */
#define XIO_EMBEDDED 256 /* address is nonterminal */
#define XIO_MAYALL INT_MAX /* all features enabled */
/* the status flags of xiofile_t */
#define XIO_DOESFORK XIO_MAYFORK
#define XIO_DOESCHILD XIO_MAYCHILD
#define XIO_DOESEXEC XIO_MAYEXEC
#define XIO_DOESCONVERT XIO_MAYCONVERT
#define XIO_DOESCHAIN XIO_MAYCHAIN
/* sometimes we use a set of allowed direction(s), a bit pattern */
#define XIOBIT_RDONLY (1<<XIO_RDONLY)
#define XIOBIT_WRONLY (1<<XIO_WRONLY)
#define XIOBIT_RDWR (1<<XIO_RDWR)
#define XIOBIT_ALL (XIOBIT_RDONLY|XIOBIT_WRONLY|XIOBIT_RDWR)
#define XIOBIT_ALLRD (XIOBIT_RDONLY|XIOBIT_RDWR)
#define XIOBIT_ALLWR (XIOBIT_WRONLY|XIOBIT_RDWR)
#define XIOBIT_ONE (XIOBIT_RDONLY|XIOBIT_WRONLY)
/* reverse the direction pattern */
#define XIOBIT_REVERSE(x) (((x)&XIOBIT_RDWR)|(((x)&XIOBIT_RDONLY)?XIOBIT_WRONLY:0)|(((x)&XIOBIT_WRONLY)?XIOBIT_RDONLY:0))
/* methods for reading and writing, and for related checks */
#define XIODATA_READMASK 0xf000 /* mask for basic r/w method */
#define XIOREAD_STREAM 0x1000 /* read() (default) */
#define XIOREAD_RECV 0x2000 /* recvfrom() */
#define XIOREAD_PTY 0x4000 /* handle EIO */
#define XIOREAD_READLINE 0x5000 /* ... */
#define XIOREAD_OPENSSL 0x6000 /* SSL_read() */
#define XIOREAD_TEST 0x7000 /* xioread_test() */
#define XIODATA_WRITEMASK 0x0f00 /* mask for basic r/w method */
#define XIOWRITE_STREAM 0x0100 /* write() (default) */
#define XIOWRITE_SENDTO 0x0200 /* sendto() */
#define XIOWRITE_PIPE 0x0300 /* write() to alternate (pipe) Fd */
#define XIOWRITE_2PIPE 0x0400 /* write() to alternate (2pipe) Fd */
#define XIOWRITE_READLINE 0x0500 /* check for prompt */
#define XIOWRITE_OPENSSL 0x0600 /* SSL_write() */
#define XIOWRITE_TEST 0x0700 /* xiowrite_test() */
#define XIOWRITE_TESTREV 0x0800 /* xiowrite_testrev() */
/* modifiers to XIODATA_READ_RECV */
#define XIOREAD_RECV_CHECKPORT 0x0001 /* recv, check peer port */
#define XIOREAD_RECV_CHECKADDR 0x0002 /* recv, check peer address */
#define XIOREAD_RECV_CHECKRANGE 0x0004 /* recv, check if peer addr in range */
#define XIOREAD_RECV_ONESHOT 0x0008 /* give EOF after first packet */
#define XIOREAD_RECV_SKIPIP 0x0010 /* recv, skip IPv4 header */
#define XIOREAD_RECV_FROM 0x0020 /* remember peer for replying */
/* combinations */
#define XIODATA_MASK (XIODATA_READMASK|XIODATA_WRITEMASK)
#define XIODATA_STREAM (XIOREAD_STREAM|XIOWRITE_STREAM)
#define XIODATA_RECVFROM (XIOREAD_RECV|XIOWRITE_SENDTO|XIOREAD_RECV_CHECKPORT|XIOREAD_RECV_CHECKADDR|XIOREAD_RECV_FROM)
#define XIODATA_RECVFROM_SKIPIP (XIODATA_RECVFROM|XIOREAD_RECV_SKIPIP)
#define XIODATA_RECVFROM_ONE (XIODATA_RECVFROM|XIOREAD_RECV_ONESHOT)
#define XIODATA_RECVFROM_SKIPIP_ONE (XIODATA_RECVFROM_SKIPIP|XIOREAD_RECV_ONESHOT)
#define XIODATA_RECV (XIOREAD_RECV|XIOWRITE_SENDTO|XIOREAD_RECV_CHECKRANGE)
#define XIODATA_RECV_SKIPIP (XIODATA_RECV|XIOREAD_RECV_SKIPIP)
#define XIODATA_PIPE (XIOREAD_STREAM|XIOWRITE_PIPE)
#define XIODATA_2PIPE (XIOREAD_STREAM|XIOWRITE_2PIPE)
#define XIODATA_PTY (XIOREAD_PTY|XIOWRITE_STREAM)
#define XIODATA_READLINE (XIOREAD_READLINE|XIOWRITE_STREAM)
#define XIODATA_OPENSSL (XIOREAD_OPENSSL|XIOWRITE_OPENSSL)
#define XIODATA_TEST (XIOREAD_TEST|XIOWRITE_TEST)
#define XIODATA_TESTUNI XIOWRITE_TEST
#define XIODATA_TESTREV XIOWRITE_TESTREV
/* XIOSHUT_* define the actions on shutdown of the address */
/* */
#define XIOSHUTRD_MASK 0x00f0
#define XIOSHUTWR_MASK 0x000f
#define XIOSHUTSPEC_MASK 0xff00 /* specific action */
#define XIOSHUTRD_UNSPEC 0x0000
#define XIOSHUTWR_UNSPEC 0x0000
#define XIOSHUTRD_NONE 0x0010 /* no action - e.g. stdin */
#define XIOSHUTWR_NONE 0x0001 /* no action - e.g. stdout */
#define XIOSHUTRD_CLOSE 0x0020 /* close() */
#define XIOSHUTWR_CLOSE 0x0002 /* close() */
#define XIOSHUTRD_DOWN 0x0030 /* shutdown(, SHUT_RD) */
#define XIOSHUTWR_DOWN 0x0003 /* shutdown(, SHUT_WR) */
#define XIOSHUTRD_SIGHUP 0x0040 /* kill sub process */
#define XIOSHUTWR_SIGHUP 0x0004 /* flush sub process with SIGHPUP */
#define XIOSHUTRD_SIGTERM 0x0050 /* kill sub process with SIGTERM */
#define XIOSHUTWR_SIGTERM 0x0005 /* kill sub process with SIGTERM */
#define XIOSHUTWR_SIGKILL 0x0006 /* kill sub process with SIGKILL */
#define XIOSHUT_UNSPEC (XIOSHUTRD_UNSPEC|XIOSHUTWR_UNSPEC)
#define XIOSHUT_NONE (XIOSHUTRD_NONE|XIOSHUTWR_NONE)
#define XIOSHUT_CLOSE (XIOSHUTRD_CLOSE|XIOSHUTWR_CLOSE)
#define XIOSHUT_DOWN (XIOSHUTRD_DOWN|XIOSHUTWR_DOWN)
#define XIOSHUT_KILL (XIOSHUTRD_KILL|XIOSHUTWR_KILL)
#define XIOSHUT_OPENSSL 0x0100 /* specific action on openssl */
/*!!!*/
#define XIOCLOSE_UNSPEC 0x0000 /* after init, when no end-close... option */
#define XIOCLOSE_NONE 0x0001 /* no action */
#define XIOCLOSE_CLOSE 0x0002 /* close() */
#define XIOCLOSE_SIGTERM 0x0003 /* send SIGTERM to sub process */
#define XIOCLOSE_SIGKILL 0x0004 /* send SIGKILL to sub process */
#define XIOCLOSE_CLOSE_SIGTERM 0x0005 /* close fd, then send SIGTERM */
#define XIOCLOSE_CLOSE_SIGKILL 0x0006 /* close fd, then send SIGKILL */
#define XIOCLOSE_SLEEP_SIGTERM 0x0007 /* short sleep, then SIGTERM */
#define XIOCLOSE_OPENSSL 0x0100
#define XIOCLOSE_READLINE 0x0101
/* these are the values allowed for the "enum xiotag tag" flag of the "struct
single" and "union bipipe" (xiofile_t) structures. */
enum xiotag {
XIO_TAG_INVALID, /* the record is not in use */
XIO_TAG_RDONLY, /* this is a single read-only stream */
XIO_TAG_WRONLY, /* this is a single write-only stream */
XIO_TAG_RDWR, /* this is a single read-write stream */
XIO_TAG_DUAL /* this is a dual stream, consisting of two single
streams */
} ;
union bipipe;
#define XIOADDR_ENDPOINT 0 /* endpoint address */
#define XIOADDR_INTER 1 /* inter address */
#define XIOADDR_SYS XIOADDR_ENDPOINT
#define XIOADDR_PROT XIOADDR_INTER
struct xioaddr_inter_desc {
int tag; /* 0: endpoint addr; 1: inter addr */
const char *defname; /* main (canonical) name of address */
int numparams; /* number of required parameters */
int leftdirs; /* set of data directions supported on left side:
e.g. XIOBIT_RDONLY|XIOBIT_WRONLY|XIOBIT_RDWR */
unsigned groups;
int howtoshut;
int howtoclose;
int (*func)(int argc, const char *argv[], struct opt *opts, int rw, union bipipe *fd, unsigned groups,
int arg1, int arg2, int arg3);
int arg1;
int arg2;
int arg3;
int rightdirs;
#if WITH_HELP
const char *syntax;
#endif
} ;
struct xioaddr_endpoint_desc {
int tag; /* 0: endpoint addr; 1: inter addr */
const char *defname; /* main (canonical) name of address */
int numparams; /* number of required parameters */
int leftdirs;
unsigned groups;
int howtoshut;
int howtoclose;
int (*func)(int argc, const char *argv[], struct opt *opts, int rw, union bipipe *fd, unsigned groups,
int arg1, int arg2, int arg3);
int arg1;
int arg2;
int arg3;
#if WITH_HELP
const char *syntax;
#endif
} ;
struct xioaddr_common_desc {
int tag; /* 0: endpoint addr; 1: inter addr */
const char *defname; /* main (canonical) name of address */
int numparams; /* number of required parameters */
int leftdirs;
unsigned groups;
int howtoshut;
int howtoclose;
} ;
union xioaddr_desc {
int tag; /* 0: endpoint addr; 1: inter addr */
struct xioaddr_common_desc common_desc;
struct xioaddr_inter_desc inter_desc;
struct xioaddr_endpoint_desc endpoint_desc;
} ;
union xioaddr_descp {
struct xioaddr_common_desc *common_desc;
int *tag; /* 0: endpoint addr; 1: inter addr */
struct xioaddr_inter_desc *inter_desc;
struct xioaddr_endpoint_desc *endpoint_desc;
} ;
/*!!! this to xio-sockd4.h */
struct socks4head {
uint8_t version;
uint8_t action;
uint16_t port;
uint32_t dest;
} ;
/* global XIO options/parameters */
typedef struct {
bool strictopts;
const char *pipesep;
const char *paramsep;
const char *optionsep;
char ip4portsep;
char ip6portsep; /* do not change, might be hardcoded somewhere! */
const char *syslogfac; /* syslog facility (only with mixed mode) */
char default_ip; /* default prot.fam for IP based listen ('4' or '6') */
char preferred_ip; /* preferred prot.fam. for name resolution ('0' for
unspecified, '4', or '6') */
char *reversechar;
char *chainsep;
size_t bufsiz;
bool verbose;
bool verbhex;
bool debug;
char logopt; /* y..syslog; s..stderr; f..file; m..mixed */
struct timeval total_timeout;/* when nothing happens, die after seconds */
struct timeval pollintv; /* with ignoreeof, reread after seconds */
struct timeval closwait; /* after close of x, die after seconds */
bool lefttoright; /* first addr ro, second addr wo */
bool righttoleft; /* first addr wo, second addr ro */
} xioopts_t;
/* pack the description of a lock file */
typedef struct {
const char *lockfile; /* name of lockfile; NULL if no locking */
bool waitlock; /* dont't exit when already locked */
struct timespec intervall; /* polling intervall */
} xiolock_t;
#define MAXARGV 8
/* a non-dual file descriptor */
typedef struct single {
enum xiotag tag; /* see enum xiotag */
const union xioaddr_desc *addrdesc;
int flags;
/* until here, keep consistent with bipipe.common !!! */
#if WITH_RETRY
unsigned int retry; /* retry opening this many times */
bool forever; /* retry opening forever */
struct timespec intervall; /* wait so long between retries */
#endif /* WITH_RETRY */
bool ignoreeof; /* option ignoreeof; do not pass eof condition to app*/
int eof; /* 1..exec'd child has died, but no explicit eof
occurred
2..fd0 has reached EOF (definitely; never with
ignoreeof! */
size_t wsize; /* write always this size; 0..all available */
size_t readbytes; /* read only so many bytes; 0...unlimited */
size_t actbytes; /* so many bytes still to be read (when readbytes!=0)*/
xiolock_t lock; /* parameters of lockfile */
bool havelock; /* we are happy owner of the above lock */
/* until here, keep consistent with bipipe.dual ! */
int reverse; /* valid during parse and overload, before open:
will this (inter) address be integrated forward or
reverse? */
const union xioaddr_desc **addrdescs;
/* valid after parse, before overload:
the list of possible address descriptors derived
from addr keyword, one of which will be selected by
context and num of parameters */
int closing; /* 0..write channel is up, 1..just shutdown write ch.,
2..counting down closing timeout, 3..no more write
possible */
bool cool_write; /* downlevel EPIPE, ECONNRESET to notice */
int argc; /* number of fields in argv */
const char *argv[MAXARGV]; /* address keyword, required args */
struct opt *opts; /* the options of this address */
int lineterm; /* 0..dont touch; 1..CR; 2..CRNL on extern data */
int fd1;
int fd2;
enum {
FDTYPE_SINGLE, /* only fd1 is in use, for reading and/or writing */
FDTYPE_DOUBLE /* fd2 is in use too - for writing */
} fdtype;
pid_t subaddrpid; /* pid of subaddress (process handling next addr in
chain) */
int subaddrstat; /* state of subaddress process
0...no sub address process
1...running
-1...ended (aborted?) */
int subaddrexit; /* if subaddstat==-1: exit code of sub process */
bool opt_unlink_close; /* option unlink_close */
char *unlink_close; /* name of a symlink or unix socket to be removed */
int dtype;
int howtoshut; /* method for shutting down xfds */
int howtoclose; /* method for closing xfds */
#if _WITH_SOCKET
union sockaddr_union peersa;
socklen_t salen;
#endif /* _WITH_SOCKET */
#if WITH_TERMIOS
bool ttyvalid; /* the following struct is valid */
struct termios savetty; /* save orig tty settings for later restore */
#endif /* WITH_TERMIOS */
/*0 const char *name;*/ /* only with END_UNLINK */
struct { /* this was for exec only, now for embedded */
pid_t pid; /* child PID, with EXEC: */
int (*sigchild)(struct single *); /* callback after sigchild */
} child;
pid_t ppid; /* parent pid, only if we send it signals */
pthread_t subthread; /* thread handling next inter-addr in chain */
union {
#if 0
struct {
int fdout; /* use fd for output */
} bipipe;
#endif
#if _WITH_SOCKET
struct {
struct timeval connect_timeout; /* how long to hang in connect() */
union sockaddr_union la; /* local socket address */
bool emptyiseof; /* with dgram: empty packet means EOF */
bool dorange;
union xiorange_union range; /* restrictions for peer address */
#if _WITH_IP4 || _WITH_IP6
struct {
unsigned int res_opts[2]; /* bits to be set in _res.options are
at [0], bits to be cleared are at [1] */
bool dosourceport;
uint16_t sourceport; /* host byte order */
bool lowport;
#if (WITH_TCP || WITH_UDP) && WITH_LIBWRAP
bool dolibwrap;
char *libwrapname;
char *tcpwrap_etc;
char *hosts_allow_table;
char *hosts_deny_table;
#endif
} ip;
#endif /* _WITH_IP4 || _WITH_IP6 */
} socket;
#endif /* _WITH_SOCKET */
struct {
pid_t pid; /* child PID, with EXEC: */
int fdout; /* use fd for output if two pipes */
} exec;
#if WITH_READLINE
struct {
char *history_file;
char *prompt; /* static prompt, passed to readline() */
size_t dynbytes; /* length of buffer for dynamic prompt */
char *dynprompt; /* the dynamic prompt */
char *dynend; /* current end of dynamic prompt */
#if HAVE_REGEX_H
bool hasnoecho; /* following regex is set */
regex_t noecho; /* if it matches the prompt, input is silent */
#endif
} readline;
#endif /* WITH_READLINE */
#if WITH_SOCKS4_SERVER
struct {
int state; /* state of socks4 protocol negotiation */
/* we cannot rely on all request data arriving at once */
struct socks4head head;
char *userid;
char *hostname; /* socks4a only */
/* the following structs are an experiment for future synchronization
mechanisms */
struct {
size_t canrecv;
size_t wantwrite;
void *inbuff;
size_t inbuflen; /* length of buffer */
size_t bytes; /* current bytes in buffer */
} proto;
struct {
size_t canrecv;
size_t wantwrite;
} peer_proto;
struct {
size_t canrecv;
size_t wantwrite;
int _errno;
} data;
struct {
size_t canrecv;
size_t wantwrite;
} peer_data;
} socks4d;
#endif /* WITH_SOCKS4_SERVER */
#if WITH_OPENSSL
struct {
struct timeval connect_timeout; /* how long to hang in connect() */
SSL *ssl;
SSL_CTX* ctx;
} openssl;
#endif /* WITH_OPENSSL */
#if WITH_TUN
struct {
short iff_opts[2]; /* ifr flags, using OFUNC_OFFSET_MASKS */
} tun;
#endif /* WITH_TUN */
#if _WITH_GZIP
struct {
gzFile in; /* for reading (uncompressing from stream to API) */
gzFile out; /* for writing (compressing from API to stream) */
int level;
} gzip;
#endif /* _WITH_GZIP */
} para;
} xiosingle_t;
/* rw: 0..read, 1..write, 2..r/w */
/* when implementing a new address type take care of following topics:
. be aware that xioopen_single is used for O_RDONLY, O_WRONLY, and O_RDWR data
. which options are allowed (option groups)
. implement application of all these options
. set FD_CLOEXEC on new file descriptors BEFORE the cloexec option might be
applied
.
*/
typedef union bipipe {
enum xiotag tag;
struct {
enum xiotag tag;
const union xioaddr_desc *addrdesc;
int flags;
} common;
struct single stream;
struct {
enum xiotag tag;
const union xioaddr_desc *addrdesc;
int flags; /* compatible to fcntl(.., F_GETFL, ..) */
#if WITH_RETRY
unsigned retry; /* retry opening this many times */
bool forever; /* retry opening forever */
struct timespec intervall; /* wait so long between retries */
#endif /* WITH_RETRY */
bool ignoreeof;
int eof; /* fd0 has reached EOF */
size_t wsize; /* write always this size; 0..all available */
size_t readbytes; /* read only so many bytes; 0...unlimited */
size_t actbytes; /* so many bytes still to be read */
xiolock_t lock; /* parameters of lockfile */
bool havelock; /* we are happy owner of the above lock */
/* until here, keep consistent with struct single ! */
xiosingle_t *stream[2]; /* input stream, output stream */
} dual;
} xiofile_t;
#define XIO_WRITABLE(s) (((s)->common.flags+1)&2)
#define XIO_READABLE(s) (((s)->common.flags+1)&1)
#define XIO_RDSTREAM(s) (((s)->tag==XIO_TAG_DUAL)?(s)->dual.stream[0]:&(s)->stream)
#define XIO_WRSTREAM(s) (((s)->tag==XIO_TAG_DUAL)?(s)->dual.stream[1]:&(s)->stream)
#define XIO_GETRDFD(s) (((s)->tag==XIO_TAG_DUAL)?(s)->dual.stream[0]->fd1:(s)->stream.fd1)
#define _XIO_GETWRFD(s) (((s)->fdtype==FDTYPE_DOUBLE)?(s)->fd2:(s)->fd1)
#define XIO_GETWRFD(s) (((s)->tag==XIO_TAG_DUAL)?_XIO_GETWRFD((s)->dual.stream[1]):_XIO_GETWRFD(&(s)->stream))
#define XIO_EOF(s) (XIO_RDSTREAM(s)->eof && !XIO_RDSTREAM(s)->ignoreeof)
typedef unsigned long flags_t;
union integral {
int u_bool;
uint8_t u_byte;
gid_t u_gidt;
int u_int;
long u_long;
#if HAVE_TYPE_LONGLONG
long long u_longlong;
#endif
double u_double;
mode_t u_modet;
short u_short;
size_t u_sizet;
char *u_string;
uid_t u_uidt;
unsigned int u_uint;
unsigned long u_ulong;
unsigned short u_ushort;
uint16_t u_2bytes;
void *u_ptr;
flags_t u_flag;
struct {
uint8_t *b_data;
size_t b_len;
} u_bin;
struct timeval u_timeval;
#if HAVE_STRUCT_LINGER
struct linger u_linger;
#endif /* HAVE_STRUCT_LINGER */
#if HAVE_STRUCT_TIMESPEC
struct timespec u_timespec;
#endif /* HAVE_STRUCT_TIMESPEC */
#if HAVE_STRUCT_IP_MREQ || HAVE_STRUCT_IP_MREQN
struct {
char *multiaddr;
char *param2; /* address, interface */
#if HAVE_STRUCT_IP_MREQN
char ifindex[IF_NAMESIZE+1];
#endif
} u_ip_mreq;
#endif
#if WITH_IP4
in_addr_t u_ip4addr;
#endif
} ;
/* some aliases */
#define u_off u_long /* please report when this causes problems */
#if defined(HAVE_BASIC_OFF64_T) && HAVE_BASIC_OFF64_T
# if HAVE_BASIC_OFF64_T==5
# define u_off64 u_long
# elif HAVE_BASIC_OFF64_T==7
# define u_off64 u_longlong
# else
# error "unexpected size of off64_t, please report this as bug"
# endif
#endif /* defined(HAVE_BASIC_OFF64_T) && HAVE_BASIC_OFF64_T */
/* this handles option instances, for communication between subroutines */
struct opt {
const struct optdesc *desc;
union integral value;
} ;
/* with threading, the arguments indirectly passed to xioengine() */
struct threadarg_struct {
xiofile_t *xfd1;
xiofile_t *xfd2;
} ;
extern const char *PIPESEP;
extern xiofile_t *sock[XIO_MAXSOCK];
/* return values of xioopensingle */
#define STAT_OK 0
#define STAT_WARNING 1
#define STAT_EXIT 2
#define STAT_NOACTION 3 /* by retropt_* when option not applied */
#define STAT_RETRYNOW -1 /* only after timeouts useful ? */
#define STAT_RETRYLATER -2 /* address cannot be opened, but user might
change something in the filesystem etc. to
make this process succeed later. */
#define STAT_NORETRY -3 /* address syntax error, not implemented etc;
not even by external changes correctable */
extern int xioinitialize(int xioflags);
extern int xio_forked_inchild(void);
extern int xiosetopt(char what, const char *arg);
extern int xioinqopt(char what, char *arg, size_t n);
extern xiofile_t *xioopen(const char *args, int xioflags);
extern xiofile_t *xioopenx(const char *addr, int xioflags, int infd, int outfd);extern int xiosocketpair(xiofile_t **xfd1p, xiofile_t **xfd2p, int how, ...);
extern int xioopensingle(char *addr, xiosingle_t *fd, int xioflags);
extern int xioopenhelp(FILE *of, int level);
/* must be outside function for use by childdied handler */
extern xiofile_t *xioallocfd(void);
extern void xiofreefd(xiofile_t *xfd);
extern int xio_opt_signal(pid_t pid, int signum);
extern void *xioengine(void *thread_arg);
extern int _socat(xiofile_t *xfd1, xiofile_t *xfd2);
extern ssize_t xioread(xiofile_t *sock1, void *buff, size_t bufsiz);
extern ssize_t xiopending(xiofile_t *sock1);
extern ssize_t xiowrite(xiofile_t *sock1, const void *buff, size_t bufsiz);
extern int xiotransfer(xiofile_t *inpipe, xiofile_t *outpipe,
unsigned char **buff, size_t bufsiz, bool righttoleft);
extern int xioshutdown(xiofile_t *sock, int how);
extern int xioclose(xiofile_t *sock);
extern void xioexit(void);
extern int (*xiohook_newchild)(void); /* xio calls this function from a new child process */
extern int socat_sigchild(struct single *file);
extern xioopts_t xioopts, *xioparams;
#endif /* !defined(__xio_h_included) */
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