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netbsd32_select.c revision 1.1.4.1 
      1 /*	$NetBSD: netbsd32_select.c,v 1.1.4.1 2001/11/14 19:13:17 nathanw Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1998, 2001 Matthew R. Green
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. The name of the author may not be used to endorse or promote products
     16  *    derived from this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
     23  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     24  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
     25  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
     26  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     28  * SUCH DAMAGE.
     29  */
     30 
     31 #include <sys/cdefs.h>
     32 __KERNEL_RCSID(0, "$NetBSD: netbsd32_select.c,v 1.1.4.1 2001/11/14 19:13:17 nathanw Exp $");
     33 
     34 #include <sys/param.h>
     35 #include <sys/systm.h>
     36 #include <sys/malloc.h>
     37 #include <sys/mount.h>
     38 #include <sys/time.h>
     39 #include <sys/vnode.h>
     40 #include <sys/file.h>
     41 #include <sys/filedesc.h>
     42 
     43 #include <sys/proc.h>
     44 
     45 #include <net/if.h>
     46 
     47 #include <compat/netbsd32/netbsd32.h>
     48 #include <compat/netbsd32/netbsd32_syscall.h>
     49 #include <compat/netbsd32/netbsd32_syscallargs.h>
     50 #include <compat/netbsd32/netbsd32_conv.h>
     51 
     52 int
     53 netbsd32_select(p, v, retval)
     54 	struct proc *p;
     55 	void *v;
     56 	register_t *retval;
     57 {
     58 	struct netbsd32_select_args /* {
     59 		syscallarg(int) nd;
     60 		syscallarg(netbsd32_fd_setp_t) in;
     61 		syscallarg(netbsd32_fd_setp_t) ou;
     62 		syscallarg(netbsd32_fd_setp_t) ex;
     63 		syscallarg(netbsd32_timevalp_t) tv;
     64 	} */ *uap = v;
     65 /* This one must be done in-line 'cause of the timeval */
     66 	struct netbsd32_timeval tv32;
     67 	caddr_t bits;
     68 	char smallbits[howmany(FD_SETSIZE, NFDBITS) * sizeof(fd_mask) * 6];
     69 	struct timeval atv;
     70 	int s, ncoll, error = 0, timo;
     71 	size_t ni;
     72 	extern int	selwait, nselcoll;
     73 	extern int selscan __P((struct proc *, fd_mask *, fd_mask *, int, register_t *));
     74 
     75 	if (SCARG(uap, nd) < 0)
     76 		return (EINVAL);
     77 	if (SCARG(uap, nd) > p->p_fd->fd_nfiles) {
     78 		/* forgiving; slightly wrong */
     79 		SCARG(uap, nd) = p->p_fd->fd_nfiles;
     80 	}
     81 	ni = howmany(SCARG(uap, nd), NFDBITS) * sizeof(fd_mask);
     82 	if (ni * 6 > sizeof(smallbits))
     83 		bits = malloc(ni * 6, M_TEMP, M_WAITOK);
     84 	else
     85 		bits = smallbits;
     86 
     87 #define	getbits(name, x) \
     88 	if (SCARG(uap, name)) { \
     89 		error = copyin((caddr_t)(u_long)SCARG(uap, name), bits + ni * x, ni); \
     90 		if (error) \
     91 			goto done; \
     92 	} else \
     93 		memset(bits + ni * x, 0, ni);
     94 	getbits(in, 0);
     95 	getbits(ou, 1);
     96 	getbits(ex, 2);
     97 #undef	getbits
     98 
     99 	if (SCARG(uap, tv)) {
    100 		error = copyin((caddr_t)(u_long)SCARG(uap, tv), (caddr_t)&tv32,
    101 			sizeof(tv32));
    102 		if (error)
    103 			goto done;
    104 		netbsd32_to_timeval(&tv32, &atv);
    105 		if (itimerfix(&atv)) {
    106 			error = EINVAL;
    107 			goto done;
    108 		}
    109 		s = splclock();
    110 		timeradd(&atv, &time, &atv);
    111 		splx(s);
    112 	} else
    113 		timo = 0;
    114 retry:
    115 	ncoll = nselcoll;
    116 	p->p_flag |= P_SELECT;
    117 	error = selscan(p, (fd_mask *)(bits + ni * 0),
    118 			   (fd_mask *)(bits + ni * 3), SCARG(uap, nd), retval);
    119 	if (error || *retval)
    120 		goto done;
    121 	if (SCARG(uap, tv)) {
    122 		/*
    123 		 * We have to recalculate the timeout on every retry.
    124 		 */
    125 		timo = hzto(&atv);
    126 		if (timo <= 0)
    127 			goto done;
    128 	}
    129 	s = splhigh();
    130 	if ((p->p_flag & P_SELECT) == 0 || nselcoll != ncoll) {
    131 		splx(s);
    132 		goto retry;
    133 	}
    134 	p->p_flag &= ~P_SELECT;
    135 	error = tsleep((caddr_t)&selwait, PSOCK | PCATCH, "select", timo);
    136 	splx(s);
    137 	if (error == 0)
    138 		goto retry;
    139 done:
    140 	p->p_flag &= ~P_SELECT;
    141 	/* select is not restarted after signals... */
    142 	if (error == ERESTART)
    143 		error = EINTR;
    144 	if (error == EWOULDBLOCK)
    145 		error = 0;
    146 	if (error == 0) {
    147 #define	putbits(name, x) \
    148 		if (SCARG(uap, name)) { \
    149 			error = copyout(bits + ni * x, (caddr_t)(u_long)SCARG(uap, name), ni); \
    150 			if (error) \
    151 				goto out; \
    152 		}
    153 		putbits(in, 3);
    154 		putbits(ou, 4);
    155 		putbits(ex, 5);
    156 #undef putbits
    157 	}
    158 out:
    159 	if (ni * 6 > sizeof(smallbits))
    160 		free(bits, M_TEMP);
    161 	return (error);
    162 }
    163