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Sweden-Number/scheduler/client.c

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/*
* Client part of the client/server communication
*
* Copyright (C) 1998 Alexandre Julliard
*/
#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/uio.h>
#include <unistd.h>
#include <stdarg.h>
#include "process.h"
#include "thread.h"
#include "server/request.h"
#include "server.h"
#include "winerror.h"
/* Some versions of glibc don't define this */
#ifndef SCM_RIGHTS
#define SCM_RIGHTS 1
#endif
/***********************************************************************
* CLIENT_ProtocolError
*/
static void CLIENT_ProtocolError( const char *err, ... )
{
THDB *thdb = THREAD_Current();
va_list args;
va_start( args, err );
fprintf( stderr, "Client protocol error:%p: ", thdb->server_tid );
vfprintf( stderr, err, args );
va_end( args );
ExitThread(1);
}
/***********************************************************************
* CLIENT_SendRequest_v
*
* Send a request to the server.
*/
static void CLIENT_SendRequest_v( enum request req, int pass_fd,
struct iovec *vec, int veclen )
{
THDB *thdb = THREAD_Current();
#ifndef HAVE_MSGHDR_ACCRIGHTS
struct cmsg_fd cmsg = { sizeof(cmsg), SOL_SOCKET, SCM_RIGHTS, pass_fd };
#endif
struct msghdr msghdr = { NULL, 0, vec, veclen, };
struct header head;
int i, ret, len;
assert( veclen > 0 );
vec[0].iov_base = &head;
vec[0].iov_len = sizeof(head);
for (i = len = 0; i < veclen; i++) len += vec[i].iov_len;
assert( len <= MAX_MSG_LENGTH );
head.type = req;
head.len = len;
head.seq = thdb->seq++;
if (pass_fd != -1) /* we have an fd to send */
{
#ifdef HAVE_MSGHDR_ACCRIGHTS
msghdr.msg_accrights = (void *)&pass_fd;
msghdr.msg_accrightslen = sizeof(pass_fd);
#else
msghdr.msg_control = &cmsg;
msghdr.msg_controllen = sizeof(cmsg);
#endif
}
if ((ret = sendmsg( thdb->socket, &msghdr, 0 )) < len)
{
if (ret == -1) perror( "sendmsg" );
CLIENT_ProtocolError( "partial msg sent %d/%d\n", ret, len );
}
/* we passed the fd now we can close it */
if (pass_fd != -1) close( pass_fd );
}
/***********************************************************************
* CLIENT_SendRequest
*
* Send a request to the server.
*/
void CLIENT_SendRequest( enum request req, int pass_fd,
int n, ... /* arg_1, len_1, etc. */ )
{
struct iovec vec[16];
va_list args;
int i;
n++; /* for vec[0] */
assert( n < 16 );
va_start( args, n );
for (i = 1; i < n; i++)
{
vec[i].iov_base = va_arg( args, void * );
vec[i].iov_len = va_arg( args, int );
}
va_end( args );
return CLIENT_SendRequest_v( req, pass_fd, vec, n );
}
/***********************************************************************
* CLIENT_WaitReply_v
*
* Wait for a reply from the server.
* Returns the error code (or 0 if OK).
*/
static unsigned int CLIENT_WaitReply_v( int *len, int *passed_fd,
struct iovec *vec, int veclen )
{
THDB *thdb = THREAD_Current();
int pass_fd = -1;
#ifdef HAVE_MSGHDR_ACCRIGHTS
struct msghdr msghdr = { NULL, 0, vec, veclen, (void*)&pass_fd, sizeof(int) };
#else
struct cmsg_fd cmsg = { sizeof(cmsg), SOL_SOCKET, SCM_RIGHTS, -1 };
struct msghdr msghdr = { NULL, 0, vec, veclen, &cmsg, sizeof(cmsg), 0 };
#endif
struct header head;
int ret, remaining;
assert( veclen > 0 );
vec[0].iov_base = &head;
vec[0].iov_len = sizeof(head);
while ((ret = recvmsg( thdb->socket, &msghdr, 0 )) == -1)
{
if (errno == EINTR) continue;
perror("recvmsg");
CLIENT_ProtocolError( "recvmsg\n" );
}
if (!ret) ExitThread(1); /* the server closed the connection; time to die... */
/* sanity checks */
if (ret < sizeof(head))
CLIENT_ProtocolError( "partial header received %d/%d\n", ret, sizeof(head) );
if ((head.len < sizeof(head)) || (head.len > MAX_MSG_LENGTH))
CLIENT_ProtocolError( "header length %d\n", head.len );
if (head.seq != thdb->seq++)
CLIENT_ProtocolError( "sequence %08x instead of %08x\n", head.seq, thdb->seq - 1 );
#ifndef HAVE_MSGHDR_ACCRIGHTS
pass_fd = cmsg.fd;
#endif
if (passed_fd)
{
*passed_fd = pass_fd;
pass_fd = -1;
}
if (len) *len = ret - sizeof(head);
if (pass_fd != -1) close( pass_fd );
remaining = head.len - ret;
while (remaining > 0) /* get remaining data */
{
char *bufp, buffer[1024];
int addlen, i, iovtot = 0;
/* see if any iovs are still incomplete, otherwise drop the rest */
for (i = 0; i < veclen && remaining > 0; i++)
{
if (iovtot + vec[i].iov_len > head.len - remaining)
{
addlen = iovtot + vec[i].iov_len - (head.len - remaining);
bufp = (char *)vec[i].iov_base + (vec[i].iov_len - addlen);
if (addlen > remaining) addlen = remaining;
if ((addlen = recv( thdb->socket, bufp, addlen, 0 )) == -1)
{
perror( "recv" );
CLIENT_ProtocolError( "recv\n" );
}
if (!addlen) ExitThread(1); /* the server closed the connection; time to die... */
if (len) *len += addlen;
remaining -= addlen;
}
iovtot += vec[i].iov_len;
}
if (remaining > 0)
addlen = remaining < sizeof(buffer) ? remaining : sizeof(buffer);
else
break;
if ((addlen = recv( thdb->socket, buffer, addlen, 0 )) == -1)
{
perror( "recv" );
CLIENT_ProtocolError( "recv\n" );
}
if (!addlen) ExitThread(1); /* the server closed the connection; time to die... */
remaining -= addlen;
}
SetLastError( head.type );
return head.type; /* error code */
}
/***********************************************************************
* CLIENT_WaitReply
*
* Wait for a reply from the server.
*/
unsigned int CLIENT_WaitReply( int *len, int *passed_fd,
int n, ... /* arg_1, len_1, etc. */ )
{
struct iovec vec[16];
va_list args;
int i;
n++; /* for vec[0] */
assert( n < 16 );
va_start( args, n );
for (i = 1; i < n; i++)
{
vec[i].iov_base = va_arg( args, void * );
vec[i].iov_len = va_arg( args, int );
}
va_end( args );
return CLIENT_WaitReply_v( len, passed_fd, vec, n );
}
/***********************************************************************
* CLIENT_WaitSimpleReply
*
* Wait for a simple fixed-length reply from the server.
*/
unsigned int CLIENT_WaitSimpleReply( void *reply, int len, int *passed_fd )
{
struct iovec vec[2];
unsigned int ret;
int got;
vec[1].iov_base = reply;
vec[1].iov_len = len;
ret = CLIENT_WaitReply_v( &got, passed_fd, vec, 2 );
if (got != len)
CLIENT_ProtocolError( "WaitSimpleReply: len %d != %d\n", len, got );
return ret;
}
/***********************************************************************
* CLIENT_NewThread
*
* Send a new thread request.
*/
int CLIENT_NewThread( THDB *thdb, int *thandle, int *phandle )
{
struct new_thread_request request;
struct new_thread_reply reply;
int fd[2];
if (socketpair( AF_UNIX, SOCK_STREAM, 0, fd ) == -1)
{
SetLastError( ERROR_TOO_MANY_OPEN_FILES ); /* FIXME */
return -1;
}
request.pid = thdb->process->server_pid;
CLIENT_SendRequest( REQ_NEW_THREAD, fd[1], 1, &request, sizeof(request) );
if (CLIENT_WaitSimpleReply( &reply, sizeof(reply), NULL )) goto error;
thdb->server_tid = reply.tid;
thdb->process->server_pid = reply.pid;
if (thdb->socket != -1) close( thdb->socket );
thdb->socket = fd[0];
thdb->seq = 0; /* reset the sequence number for the new fd */
fcntl( fd[0], F_SETFD, 1 ); /* set close on exec flag */
if (thandle) *thandle = reply.thandle;
else if (reply.thandle != -1) CloseHandle( reply.thandle );
if (phandle) *phandle = reply.phandle;
else if (reply.phandle != -1) CloseHandle( reply.phandle );
return 0;
error:
close( fd[0] );
return -1;
}
/***********************************************************************
* CLIENT_InitThread
*
* Send an init thread request. Return 0 if OK.
*/
int CLIENT_InitThread(void)
{
THDB *thdb = THREAD_Current();
struct init_thread_request init;
int len = strlen( thdb->process->env_db->cmd_line );
init.unix_pid = getpid();
len = MIN( len, MAX_MSG_LENGTH - sizeof(init) );
CLIENT_SendRequest( REQ_INIT_THREAD, -1, 2,
&init, sizeof(init),
thdb->process->env_db->cmd_line, len );
return CLIENT_WaitReply( NULL, NULL, 0 );
}
/***********************************************************************
* CLIENT_SetDebug
*
* Send a set debug level request. Return 0 if OK.
*/
int CLIENT_SetDebug( int level )
{
CLIENT_SendRequest( REQ_SET_DEBUG, -1, 1, &level, sizeof(level) );
return CLIENT_WaitReply( NULL, NULL, 0 );
}
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