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Split sendit into two parts. The first part, still called sendit, that

Browse Source 
does the copyin stuff and then calls the second part kern_sendit to do
the hard work. Don't bother holding Giant during the copyin phase.

The intent of this is to allow the Linux emulator to impliment send*
syscalls without using the stackgap.
This commit is contained in:
dwmalone 2003-05-05 20:33:38 +00:00
parent a6a4c99084
commit 86e87d5e2d
2 changed files with 69 additions and 50 deletions
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115
sys/kern/uipc_syscalls.c
View File

@ -619,47 +619,18 @@ sendit(td, s, mp, flags)
register struct msghdr *mp;
int flags;
{
struct uio auio;
register struct iovec *iov;
register int i;
struct mbuf *control;
struct sockaddr *to = NULL;
int len, error;
struct socket *so;
#ifdef KTRACE
struct iovec *ktriov = NULL;
struct uio ktruio;
int iovlen;
#endif
struct sockaddr *to;
int error;
if ((error = fgetsock(td, s, &so, NULL)) != 0)
return (error);
#ifdef MAC
error = mac_check_socket_send(td->td_ucred, so);
if (error)
goto bad;
#endif
auio.uio_iov = mp->msg_iov;
auio.uio_iovcnt = mp->msg_iovlen;
auio.uio_segflg = UIO_USERSPACE;
auio.uio_rw = UIO_WRITE;
auio.uio_td = td;
auio.uio_offset = 0; /* XXX */
auio.uio_resid = 0;
iov = mp->msg_iov;
for (i = 0; i < mp->msg_iovlen; i++, iov++) {
if ((auio.uio_resid += iov->iov_len) < 0) {
error = EINVAL;
goto bad;
}
}
if (mp->msg_name) {
if (mp->msg_name != NULL) {
error = getsockaddr(&to, mp->msg_name, mp->msg_namelen);
if (error)
goto bad;
}
return error;
mp->msg_name = to;
} else
to = NULL;
if (mp->msg_control) {
if (mp->msg_controllen < sizeof(struct cmsghdr)
#ifdef COMPAT_OLDSOCK
@ -690,7 +661,59 @@ sendit(td, s, mp, flags)
}
#endif
} else {
control = 0;
control = NULL;
}
error = kern_sendit(td, s, mp, flags, control);
bad:
if (to)
FREE(to, M_SONAME);
return (error);
}
int
kern_sendit(td, s, mp, flags, control)
struct thread *td;
int s;
struct msghdr *mp;
int flags;
struct mbuf *control;
{
struct uio auio;
struct iovec *iov;
struct socket *so;
int i;
int len, error;
#ifdef KTRACE
struct iovec *ktriov = NULL;
struct uio ktruio;
int iovlen;
#endif
mtx_lock(&Giant);
if ((error = fgetsock(td, s, &so, NULL)) != 0)
goto bad2;
#ifdef MAC
error = mac_check_socket_send(td->td_ucred, so);
if (error)
goto bad;
#endif
auio.uio_iov = mp->msg_iov;
auio.uio_iovcnt = mp->msg_iovlen;
auio.uio_segflg = UIO_USERSPACE;
auio.uio_rw = UIO_WRITE;
auio.uio_td = td;
auio.uio_offset = 0; /* XXX */
auio.uio_resid = 0;
iov = mp->msg_iov;
for (i = 0; i < mp->msg_iovlen; i++, iov++) {
if ((auio.uio_resid += iov->iov_len) < 0) {
error = EINVAL;
goto bad;
}
}
#ifdef KTRACE
if (KTRPOINT(td, KTR_GENIO)) {
@ -701,8 +724,8 @@ sendit(td, s, mp, flags)
}
#endif
len = auio.uio_resid;
error = so->so_proto->pr_usrreqs->pru_sosend(so, to, &auio, 0, control,
flags, td);
error = so->so_proto->pr_usrreqs->pru_sosend(so, mp->msg_name, &auio,
0, control, flags, td);
if (error) {
if (auio.uio_resid != len && (error == ERESTART ||
error == EINTR || error == EWOULDBLOCK))
@ -728,8 +751,8 @@ sendit(td, s, mp, flags)
#endif
bad:
fputsock(so);
if (to)
FREE(to, M_SONAME);
bad2:
mtx_unlock(&Giant);
return (error);
}
@ -762,9 +785,7 @@ sendto(td, uap)
#endif
aiov.iov_base = uap->buf;
aiov.iov_len = uap->len;
mtx_lock(&Giant);
error = sendit(td, uap->s, &msg, uap->flags);
mtx_unlock(&Giant);
return (error);
}
@ -794,9 +815,7 @@ osend(td, uap)
aiov.iov_len = uap->len;
msg.msg_control = 0;
msg.msg_flags = 0;
mtx_lock(&Giant);
error = sendit(td, uap->s, &msg, uap->flags);
mtx_unlock(&Giant);
return (error);
}
@ -816,7 +835,6 @@ osendmsg(td, uap)
struct iovec aiov[UIO_SMALLIOV], *iov;
int error;
mtx_lock(&Giant);
error = copyin(uap->msg, &msg, sizeof (struct omsghdr));
if (error)
goto done2;
@ -842,7 +860,6 @@ osendmsg(td, uap)
if (iov != aiov)
FREE(iov, M_IOV);
done2:
mtx_unlock(&Giant);
return (error);
}
#endif
@ -863,7 +880,6 @@ sendmsg(td, uap)
struct iovec aiov[UIO_SMALLIOV], *iov;
int error;
mtx_lock(&Giant);
error = copyin(uap->msg, &msg, sizeof (msg));
if (error)
goto done2;
@ -891,7 +907,6 @@ sendmsg(td, uap)
if (iov != aiov)
FREE(iov, M_IOV);
done2:
mtx_unlock(&Giant);
return (error);
}

4
sys/sys/syscallsubr.h
View File

@ -32,6 +32,8 @@
#include <sys/uio.h>
struct sockaddr;
struct msghdr;
struct mbuf;
int kern___getcwd(struct thread *td, u_char *buf, enum uio_seg bufseg,
u_int buflen);
@ -70,6 +72,8 @@ int kern_rename(struct thread *td, char *from, char *to,
int kern_rmdir(struct thread *td, char *path, enum uio_seg pathseg);
int kern_select(struct thread *td, int nd, fd_set *fd_in, fd_set *fd_ou,
fd_set *fd_ex, struct timeval *tvp);
int kern_sendit(struct thread *td, int s, struct msghdr *mp, int flags,
struct mbuf *control);
int kern_shmat(struct thread *td, int shmid, const void *shmaddr,
int shmflg, int wantrem);
int kern_shmctl(struct thread *td, int shmid, int cmd, void *buf,