[unix-history] / usr / src / sys / kern / uipc_syscalls.c

/*      uipc_syscalls.c 4.17    82/04/10        */

#include "../h/param.h"
#include "../h/systm.h"
#include "../h/dir.h"
#include "../h/user.h"
#include "../h/proc.h"
#include "../h/file.h"
#include "../h/inode.h"
#include "../h/buf.h"
#include "../h/mbuf.h"
#include "../h/protosw.h"
#include "../h/socket.h"
#include "../h/socketvar.h"
#include "../net/in.h"
#include "../net/in_systm.h"

/*
* Socket system call interface.
*
* These routines interface the socket routines to UNIX,
* isolating the system interface from the socket-protocol interface.
*
* TODO:
*      SO_INTNOTIFY
*/

static  struct sockproto localproto = { PF_UNIX, 0 };
/*
* Pipe system call interface.
*/
spipe()
{
       register struct file *rf, *wf;
       struct socket *rso, *wso;
       int r;
COUNT(SPIPE);
       
       u.u_error = socreate(&rso, SOCK_STREAM,
           &localproto, (struct sockaddr *)0, 0);
       if (u.u_error)
               return;
       u.u_error = socreate(&wso, SOCK_STREAM,
           &localproto, (struct sockaddr *)0, 0);
       if (u.u_error)
               goto free;
       rf = falloc();
       if (rf == NULL)
               goto free2;
       r = u.u_r.r_val1;
       rf->f_flag = FREAD|FSOCKET;
       rf->f_socket = rso;
       wf = falloc();
       if (wf == NULL)
               goto free3;
       wf->f_flag = FWRITE|FSOCKET;
       wf->f_socket = wso;
       u.u_r.r_val2 = u.u_r.r_val1;
       u.u_r.r_val1 = r;
       if (piconnect(wso, rso) == 0)
               goto free4;
       return;
free4:
       wf->f_count = 0;
       u.u_ofile[u.u_r.r_val1] = 0;
free3:
       rf->f_count = 0;
       u.u_ofile[r] = 0;
free2:
       wso->so_state |= SS_USERGONE;
       sofree(wso);
free:
       rso->so_state |= SS_USERGONE;
       sofree(rso);
}

/*
* Socket system call interface.  Copy sa arguments
* set up file descriptor and call internal socket
* creation routine.
*/
ssocket()
{
       register struct a {
               int     type;
               struct  sockproto *asp;
               struct  sockaddr *asa;
               int     options;
       } *uap = (struct a *)u.u_ap;
       struct sockproto sp;
       struct sockaddr sa;
       struct socket *so;
       register struct file *fp;
COUNT(SSOCKET);

       if ((fp = falloc()) == NULL)
               return;
       fp->f_flag = FSOCKET|FREAD|FWRITE;
       if (uap->asp && copyin((caddr_t)uap->asp, (caddr_t)&sp, sizeof (sp)) ||
           uap->asa && copyin((caddr_t)uap->asa, (caddr_t)&sa, sizeof (sa))) {
               u.u_error = EFAULT;
               return;
       }
       u.u_error = socreate(&so, uap->type,
           uap->asp ? &sp : 0, uap->asa ? &sa : 0, uap->options);
       if (u.u_error)
               goto bad;
       fp->f_socket = so;
       return;
bad:
       u.u_ofile[u.u_r.r_val1] = 0;
       fp->f_count = 0;
}

/*
* Accept system call interface.
*/
saccept()
{
       register struct a {
               int     fdes;
               struct  sockaddr *asa;
       } *uap = (struct a *)u.u_ap;
       struct sockaddr sa;
       register struct file *fp;
       struct socket *so;
       int s;
COUNT(SACCEPT);

       if (uap->asa && useracc((caddr_t)uap->asa, sizeof (sa), B_WRITE)==0) {
               u.u_error = EFAULT;
               return;
       }
       fp = getf(uap->fdes);
       if (fp == 0)
               return;
       if ((fp->f_flag & FSOCKET) == 0) {
               u.u_error = ENOTSOCK;
               return;
       }
       s = splnet();
       so = fp->f_socket;
       if ((so->so_state & SS_NBIO) &&
           (so->so_state & SS_CONNAWAITING) == 0) {
               u.u_error = EWOULDBLOCK;
               splx(s);
               return;
       }
       while ((so->so_state & SS_CONNAWAITING) == 0 && so->so_error == 0)
               sleep((caddr_t)&so->so_timeo, PZERO+1);
       if (so->so_error) {
               u.u_error = so->so_error;
               splx(s);
               return;
       }
       u.u_error = soaccept(so, &sa);
       if (u.u_error) {
               splx(s);
               return;
       }
       if (uap->asa)
               (void) copyout((caddr_t)&sa, (caddr_t)uap->asa, sizeof (sa));
       /* deal with new file descriptor case */
       /* u.u_r.r_val1 = ... */
       splx(s);
}

/*
* Connect socket to foreign peer; system call
* interface.  Copy sa arguments and call internal routine.
*/
sconnect()
{
       register struct a {
               int     fdes;
               struct  sockaddr *a;
       } *uap = (struct a *)u.u_ap;
       struct sockaddr sa;
       register struct file *fp;
       register struct socket *so;
       int s;
COUNT(SCONNECT);

       if (copyin((caddr_t)uap->a, (caddr_t)&sa, sizeof (sa))) {
               u.u_error = EFAULT;
               return;
       }
       fp = getf(uap->fdes);
       if (fp == 0)
               return;
       if ((fp->f_flag & FSOCKET) == 0) {
               u.u_error = ENOTSOCK;
               return;
       }
       so = fp->f_socket;
       u.u_error = soconnect(so, &sa);
       if (u.u_error)
               return;
       s = splnet();
       if ((so->so_state & SS_NBIO) &&
           (so->so_state & SS_ISCONNECTING)) {
               u.u_error = EINPROGRESS;
               splx(s);
               return;
       }
       while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0)
               sleep((caddr_t)&so->so_timeo, PZERO+1);
       u.u_error = so->so_error;
       so->so_error = 0;
       splx(s);
}

/*
* Send data on socket.
*/
ssend()
{
       register struct a {
               int     fdes;
               struct  sockaddr *asa;
               caddr_t cbuf;
               unsigned count;
       } *uap = (struct a *)u.u_ap;
       register struct file *fp;
       struct sockaddr sa;
COUNT(SSEND);

       fp = getf(uap->fdes);
       if (fp == 0)
               return;
       if ((fp->f_flag & FSOCKET) == 0) {
               u.u_error = ENOTSOCK;
               return;
       }
       u.u_base = uap->cbuf;
       u.u_count = uap->count;
       u.u_segflg = 0;
       if (useracc(uap->cbuf, uap->count, B_READ) == 0 ||
           uap->asa && copyin((caddr_t)uap->asa, (caddr_t)&sa, sizeof (sa))) {
               u.u_error = EFAULT;
               return;
       }
       u.u_error = sosend(fp->f_socket, uap->asa ? &sa : 0);
       u.u_r.r_val1 = uap->count - u.u_count;
}

/*
* Receive data on socket.
*/
sreceive()
{
       register struct a {
               int     fdes;
               struct  sockaddr *asa;
               caddr_t cbuf;
               u_int   count;
       } *uap = (struct a *)u.u_ap;
       register struct file *fp;
       struct sockaddr sa;
COUNT(SRECEIVE);

       fp = getf(uap->fdes);
       if (fp == 0)
               return;
       if ((fp->f_flag & FSOCKET) == 0) {
               u.u_error = ENOTSOCK;
               return;
       }
       u.u_base = uap->cbuf;
       u.u_count = uap->count;
       u.u_segflg = 0;
       if (useracc(uap->cbuf, uap->count, B_WRITE) == 0 ||
           uap->asa && copyin((caddr_t)uap->asa, (caddr_t)&sa, sizeof (sa))) {
               u.u_error = EFAULT;
               return;
       }
       u.u_error = soreceive(fp->f_socket, uap->asa ? &sa : 0);
       if (u.u_error)
               return;
       if (uap->asa)
               (void) copyout((caddr_t)&sa, (caddr_t)uap->asa, sizeof (sa));
       u.u_r.r_val1 = uap->count - u.u_count;
}

/*
* Get socket address.
*/
ssocketaddr()
{
       register struct a {
               int     fdes;
               struct  sockaddr *asa;
       } *uap = (struct a *)u.u_ap;
       register struct file *fp;
       register struct socket *so;
       struct sockaddr addr;
COUNT(SSOCKETADDR);

       fp = getf(uap->fdes);
       if (fp == 0)
               return;
       if ((fp->f_flag & FSOCKET) == 0) {
               u.u_error = ENOTSOCK;
               return;
       }
       so = fp->f_socket;
       u.u_error =
               (*so->so_proto->pr_usrreq)(so, PRU_SOCKADDR, 0, (caddr_t)&addr);
       if (u.u_error)
               return;
       if (copyout((caddr_t)&addr, (caddr_t)uap->asa, sizeof (addr)))
               u.u_error = EFAULT;
}