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[unix-history] / usr / src / sys / kern / sys_generic.c
/*
* Copyright (c) 1982, 1986, 1989 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by the University of California, Berkeley. The name of the
* University may not be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*
* @(#)sys_generic.c 7.13 (Berkeley) %G%
*/
#include "param.h"
#include "systm.h"
#include "syscontext.h"
#include "ioctl.h"
#include "file.h"
#include "proc.h"
#include "uio.h"
#include "kernel.h"
#include "stat.h"
#include "malloc.h"
#ifdef KTRACE
#include "ktrace.h"
#endif
/*
* Read system call.
*/
read()
{
register struct a {
int fdes;
char *cbuf;
unsigned count;
} *uap = (struct a *)u.u_ap;
register struct file *fp;
struct uio auio;
struct iovec aiov;
long cnt, error = 0;
#ifdef KTRACE
struct iovec ktriov;
#endif
if (((unsigned)uap->fdes) >= NOFILE ||
(fp = u.u_ofile[uap->fdes]) == NULL ||
(fp->f_flag & FREAD) == 0)
RETURN (EBADF);
if (uap->count < 0)
RETURN (EINVAL);
aiov.iov_base = (caddr_t)uap->cbuf;
aiov.iov_len = uap->count;
auio.uio_iov = &aiov;
auio.uio_iovcnt = 1;
auio.uio_resid = uap->count;
auio.uio_rw = UIO_READ;
auio.uio_segflg = UIO_USERSPACE;
#ifdef KTRACE
/*
* if tracing, save a copy of iovec
*/
if (KTRPOINT(u.u_procp, KTR_GENIO))
ktriov = aiov;
#endif
cnt = uap->count;
if (setjmp(&u.u_qsave)) {
if (auio.uio_resid == cnt) {
if ((u.u_sigintr & sigmask(u.u_procp->p_cursig)) != 0)
error = EINTR;
else
u.u_eosys = RESTARTSYS;
}
} else
error = (*fp->f_ops->fo_read)(fp, &auio, fp->f_cred);
cnt -= auio.uio_resid;
#ifdef KTRACE
if (KTRPOINT(u.u_procp, KTR_GENIO))
ktrgenio(u.u_procp->p_tracep, uap->fdes, UIO_READ, &ktriov, cnt);
#endif
u.u_r.r_val1 = cnt;
RETURN (error);
}
readv()
{
register struct a {
int fdes;
struct iovec *iovp;
unsigned iovcnt;
} *uap = (struct a *)u.u_ap;
register struct file *fp;
struct uio auio;
register struct iovec *iov;
struct iovec aiov[UIO_SMALLIOV];
long i, cnt, error = 0;
#ifdef KTRACE
struct iovec *ktriov = NULL;
#endif
if (((unsigned)uap->fdes) >= NOFILE ||
(fp = u.u_ofile[uap->fdes]) == NULL ||
(fp->f_flag & FREAD) == 0)
RETURN (EBADF);
if (uap->iovcnt > UIO_SMALLIOV) {
if (uap->iovcnt > UIO_MAXIOV)
RETURN (EINVAL);
MALLOC(iov, struct iovec *,
sizeof(struct iovec) * uap->iovcnt, M_IOV, M_WAITOK);
} else
iov = aiov;
auio.uio_iov = iov;
auio.uio_iovcnt = uap->iovcnt;
auio.uio_rw = UIO_READ;
auio.uio_segflg = UIO_USERSPACE;
if (error = copyin((caddr_t)uap->iovp, (caddr_t)iov,
uap->iovcnt * sizeof (struct iovec)))
goto done;
auio.uio_resid = 0;
for (i = 0; i < uap->iovcnt; i++) {
if (iov->iov_len < 0) {
error = EINVAL;
goto done;
}
auio.uio_resid += iov->iov_len;
if (auio.uio_resid < 0) {
error = EINVAL;
goto done;
}
iov++;
}
#ifdef KTRACE
/*
* if tracing, save a copy of iovec
*/
if (KTRPOINT(u.u_procp, KTR_GENIO)) {
int iovlen = auio.uio_iovcnt * sizeof (struct iovec);
MALLOC(ktriov, struct iovec *, iovlen, M_TEMP, M_WAITOK);
bcopy((caddr_t)auio.uio_iov, (caddr_t)ktriov, iovlen);
}
#endif
cnt = auio.uio_resid;
if (setjmp(&u.u_qsave)) {
if (auio.uio_resid == cnt) {
if ((u.u_sigintr & sigmask(u.u_procp->p_cursig)) != 0)
error = EINTR;
else
u.u_eosys = RESTARTSYS;
}
} else
error = (*fp->f_ops->fo_read)(fp, &auio, fp->f_cred);
cnt -= auio.uio_resid;
#ifdef KTRACE
if (ktriov != NULL) {
ktrgenio(u.u_procp->p_tracep, uap->fdes, UIO_READ, ktriov, cnt);
FREE(ktriov, M_TEMP);
}
#endif
u.u_r.r_val1 = cnt;
done:
if (uap->iovcnt > UIO_SMALLIOV)
FREE(iov, M_IOV);
RETURN (error);
}
/*
* Write system call
*/
write()
{
register struct a {
int fdes;
char *cbuf;
unsigned count;
} *uap = (struct a *)u.u_ap;
register struct file *fp;
struct uio auio;
struct iovec aiov;
long cnt, error = 0;
#ifdef KTRACE
struct iovec ktriov;
#endif
if (((unsigned)uap->fdes) >= NOFILE ||
(fp = u.u_ofile[uap->fdes]) == NULL ||
(fp->f_flag & FWRITE) == 0)
RETURN (EBADF);
if (uap->count < 0)
RETURN (EINVAL);
aiov.iov_base = (caddr_t)uap->cbuf;
aiov.iov_len = uap->count;
auio.uio_iov = &aiov;
auio.uio_iovcnt = 1;
auio.uio_resid = uap->count;
auio.uio_rw = UIO_WRITE;
auio.uio_segflg = UIO_USERSPACE;
#ifdef KTRACE
/*
* if tracing, save a copy of iovec
*/
if (KTRPOINT(u.u_procp, KTR_GENIO))
ktriov = aiov;
#endif
cnt = uap->count;
if (setjmp(&u.u_qsave)) {
if (auio.uio_resid == cnt) {
if ((u.u_sigintr & sigmask(u.u_procp->p_cursig)) != 0)
error = EINTR;
else
u.u_eosys = RESTARTSYS;
}
} else
error = (*fp->f_ops->fo_write)(fp, &auio, fp->f_cred);
cnt -= auio.uio_resid;
#ifdef KTRACE
if (KTRPOINT(u.u_procp, KTR_GENIO))
ktrgenio(u.u_procp->p_tracep, uap->fdes, UIO_WRITE,
&ktriov, cnt);
#endif
u.u_r.r_val1 = cnt;
RETURN (error);
}
writev()
{
register struct a {
int fdes;
struct iovec *iovp;
unsigned iovcnt;
} *uap = (struct a *)u.u_ap;
register struct file *fp;
struct uio auio;
register struct iovec *iov;
struct iovec aiov[UIO_SMALLIOV];
long i, cnt, error = 0;
#ifdef KTRACE
struct iovec *ktriov = NULL;
#endif
if (((unsigned)uap->fdes) >= NOFILE ||
(fp = u.u_ofile[uap->fdes]) == NULL ||
(fp->f_flag & FWRITE) == 0)
RETURN (EBADF);
if (uap->iovcnt > UIO_SMALLIOV) {
if (uap->iovcnt > UIO_MAXIOV)
RETURN (EINVAL);
MALLOC(iov, struct iovec *,
sizeof(struct iovec) * uap->iovcnt, M_IOV, M_WAITOK);
} else
iov = aiov;
auio.uio_iov = iov;
auio.uio_iovcnt = uap->iovcnt;
auio.uio_rw = UIO_WRITE;
auio.uio_segflg = UIO_USERSPACE;
if (error = copyin((caddr_t)uap->iovp, (caddr_t)iov,
uap->iovcnt * sizeof (struct iovec)))
goto done;
auio.uio_resid = 0;
for (i = 0; i < uap->iovcnt; i++) {
if (iov->iov_len < 0) {
error = EINVAL;
goto done;
}
auio.uio_resid += iov->iov_len;
if (auio.uio_resid < 0) {
error = EINVAL;
goto done;
}
iov++;
}
#ifdef KTRACE
/*
* if tracing, save a copy of iovec
*/
if (KTRPOINT(u.u_procp, KTR_GENIO)) {
int iovlen = auio.uio_iovcnt * sizeof (struct iovec);
MALLOC(ktriov, struct iovec *, iovlen, M_TEMP, M_WAITOK);
bcopy((caddr_t)auio.uio_iov, (caddr_t)ktriov, iovlen);
}
#endif
cnt = auio.uio_resid;
if (setjmp(&u.u_qsave)) {
if (auio.uio_resid == cnt) {
if ((u.u_sigintr & sigmask(u.u_procp->p_cursig)) != 0)
error = EINTR;
else
u.u_eosys = RESTARTSYS;
}
} else
error = (*fp->f_ops->fo_write)(fp, &auio, fp->f_cred);
cnt -= auio.uio_resid;
#ifdef KTRACE
if (ktriov != NULL) {
ktrgenio(u.u_procp->p_tracep, uap->fdes, UIO_WRITE,
ktriov, cnt);
FREE(ktriov, M_TEMP);
}
#endif
u.u_r.r_val1 = cnt;
done:
if (uap->iovcnt > UIO_SMALLIOV)
FREE(iov, M_IOV);
RETURN (error);
}
/*
* Ioctl system call
*/
ioctl()
{
register struct file *fp;
struct a {
int fdes;
int cmd;
caddr_t cmarg;
} *uap = (struct a *)u.u_ap;
register int com;
register u_int size;
caddr_t memp = 0;
#define STK_PARAMS 128
char stkbuf[STK_PARAMS];
caddr_t data = stkbuf;
if ((unsigned)uap->fdes >= NOFILE ||
(fp = u.u_ofile[uap->fdes]) == NULL)
RETURN (EBADF);
if ((fp->f_flag & (FREAD|FWRITE)) == 0) {
u.u_error = EBADF;
return;
}
com = uap->cmd;
if (com == FIOCLEX) {
u.u_pofile[uap->fdes] |= UF_EXCLOSE;
return;
}
if (com == FIONCLEX) {
u.u_pofile[uap->fdes] &= ~UF_EXCLOSE;
return;
}
/*
* Interpret high order word to find
* amount of data to be copied to/from the
* user's address space.
*/
size = IOCPARM_LEN(com);
if (size > IOCPARM_MAX) {
u.u_error = ENOTTY;
return;
}
if (size > sizeof (stkbuf)) {
memp = (caddr_t)malloc((u_long)IOCPARM_LEN(com), M_IOCTLOPS,
M_WAITOK);
data = memp;
}
if (com&IOC_IN) {
if (size) {
u.u_error = copyin(uap->cmarg, data, (u_int)size);
if (u.u_error) {
if (memp)
free(memp, M_IOCTLOPS);
return;
}
} else
*(caddr_t *)data = uap->cmarg;
} else if ((com&IOC_OUT) && size)
/*
* Zero the buffer so the user always
* gets back something deterministic.
*/
bzero(data, size);
else if (com&IOC_VOID)
*(caddr_t *)data = uap->cmarg;
switch (com) {
case FIONBIO:
u.u_error = fset(fp, FNDELAY, *(int *)data);
break;
case FIOASYNC:
u.u_error = fset(fp, FASYNC, *(int *)data);
break;
case FIOSETOWN:
u.u_error = fsetown(fp, *(int *)data);
break;
case FIOGETOWN:
u.u_error = fgetown(fp, (int *)data);
break;
default:
if (setjmp(&u.u_qsave))
u.u_error = EINTR;
else
u.u_error = (*fp->f_ops->fo_ioctl)(fp, com, data);
/*
* Copy any data to user, size was
* already set and checked above.
*/
if (u.u_error == 0 && (com&IOC_OUT) && size)
u.u_error = copyout(data, uap->cmarg, (u_int)size);
break;
}
if (memp)
free(memp, M_IOCTLOPS);
}
int unselect();
int nselcoll;
/*
* Select system call.
*/
select()
{
register struct uap {
int nd;
fd_set *in, *ou, *ex;
struct timeval *tv;
} *uap = (struct uap *)u.u_ap;
fd_set ibits[3], obits[3];
struct timeval atv;
int s, ncoll, ni;
label_t lqsave;
bzero((caddr_t)ibits, sizeof(ibits));
bzero((caddr_t)obits, sizeof(obits));
if (uap->nd > NOFILE)
uap->nd = NOFILE; /* forgiving, if slightly wrong */
ni = howmany(uap->nd, NFDBITS);
#define getbits(name, x) \
if (uap->name) { \
u.u_error = copyin((caddr_t)uap->name, (caddr_t)&ibits[x], \
(unsigned)(ni * sizeof(fd_mask))); \
if (u.u_error) \
goto done; \
}
getbits(in, 0);
getbits(ou, 1);
getbits(ex, 2);
#undef getbits
if (uap->tv) {
u.u_error = copyin((caddr_t)uap->tv, (caddr_t)&atv,
sizeof (atv));
if (u.u_error)
goto done;
if (itimerfix(&atv)) {
u.u_error = EINVAL;
goto done;
}
s = splhigh(); timevaladd(&atv, &time); splx(s);
}
retry:
ncoll = nselcoll;
u.u_procp->p_flag |= SSEL;
u.u_r.r_val1 = selscan(ibits, obits, uap->nd);
if (u.u_error || u.u_r.r_val1)
goto done;
s = splhigh();
/* this should be timercmp(&time, &atv, >=) */
if (uap->tv && (time.tv_sec > atv.tv_sec ||
time.tv_sec == atv.tv_sec && time.tv_usec >= atv.tv_usec)) {
splx(s);
goto done;
}
if ((u.u_procp->p_flag & SSEL) == 0 || nselcoll != ncoll) {
splx(s);
goto retry;
}
u.u_procp->p_flag &= ~SSEL;
if (uap->tv) {
lqsave = u.u_qsave;
if (setjmp(&u.u_qsave)) {
untimeout(unselect, (caddr_t)u.u_procp);
u.u_error = EINTR;
splx(s);
goto done;
}
timeout(unselect, (caddr_t)u.u_procp, hzto(&atv));
}
tsleep((caddr_t)&selwait, PZERO+1, SLP_SELECT, 0);
if (uap->tv) {
u.u_qsave = lqsave;
untimeout(unselect, (caddr_t)u.u_procp);
}
splx(s);
goto retry;
done:
u.u_procp->p_flag &= ~SSEL;
#define putbits(name, x) \
if (uap->name) { \
int error = copyout((caddr_t)&obits[x], (caddr_t)uap->name, \
(unsigned)(ni * sizeof(fd_mask))); \
if (error) \
u.u_error = error; \
}
if (u.u_error == 0) {
putbits(in, 0);
putbits(ou, 1);
putbits(ex, 2);
#undef putbits
}
}
unselect(p)
register struct proc *p;
{
register int s = splhigh();
switch (p->p_stat) {
case SSLEEP:
setrun(p);
break;
case SSTOP:
unsleep(p);
break;
}
splx(s);
}
selscan(ibits, obits, nfd)
fd_set *ibits, *obits;
{
register int which, i, j;
register fd_mask bits;
int flag;
struct file *fp;
int n = 0;
for (which = 0; which < 3; which++) {
switch (which) {
case 0:
flag = FREAD; break;
case 1:
flag = FWRITE; break;
case 2:
flag = 0; break;
}
for (i = 0; i < nfd; i += NFDBITS) {
bits = ibits[which].fds_bits[i/NFDBITS];
while ((j = ffs(bits)) && i + --j < nfd) {
bits &= ~(1 << j);
fp = u.u_ofile[i + j];
if (fp == NULL) {
u.u_error = EBADF;
break;
}
if ((*fp->f_ops->fo_select)(fp, flag)) {
FD_SET(i + j, &obits[which]);
n++;
}
}
}
}
return (n);
}
/*ARGSUSED*/
seltrue(dev, flag)
dev_t dev;
int flag;
{
return (1);
}
selwakeup(p, coll)
register struct proc *p;
int coll;
{
if (coll) {
nselcoll++;
wakeup((caddr_t)&selwait);
}
if (p) {
int s = splhigh();
if (p->p_wchan == (caddr_t)&selwait) {
if (p->p_stat == SSLEEP)
setrun(p);
else
unsleep(p);
} else if (p->p_flag & SSEL)
p->p_flag &= ~SSEL;
splx(s);
}
}
Continuous source code history from original PDP-7 UNIX to FreeBSD 2, the first fully unencumbered FreeBSD release.