Alexandre Julliard : server: Make the fd passing code slightly more portable.
Module: wine Branch: master Commit: 179715251dbb399768ae0ef423ae094c4438face URL: http://source.winehq.org/git/wine.git/?a=commit;h=179715251dbb399768ae0ef423... Author: Alexandre Julliard <julliard(a)winehq.org> Date: Thu Sep 30 11:53:07 2010 +0200 server: Make the fd passing code slightly more portable. --- dlls/ntdll/server.c | 76 +++++++++++++++++-------------------------- server/request.c | 88 ++++++++++++++++++++++++++++----------------------- 2 files changed, 78 insertions(+), 86 deletions(-) diff --git a/dlls/ntdll/server.c b/dlls/ntdll/server.c index b3a8b21..f7c2ef5 100644 --- a/dlls/ntdll/server.c +++ b/dlls/ntdll/server.c @@ -99,20 +99,6 @@ static const enum cpu_type client_cpu = CPU_ARM; unsigned int server_cpus = 0; int is_wow64 = FALSE; -#ifndef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS -/* data structure used to pass an fd with sendmsg/recvmsg */ -struct cmsg_fd -{ - struct - { - size_t len; /* size of structure */ - int level; /* SOL_SOCKET */ - int type; /* SCM_RIGHTS */ - } header; - int fd; /* fd to pass */ -}; -#endif /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */ - timeout_t server_start_time = 0; /* time of server startup */ sigset_t server_block_set; /* signals to block during server calls */ @@ -334,35 +320,36 @@ void server_leave_uninterrupted_section( RTL_CRITICAL_SECTION *cs, sigset_t *sig */ void CDECL wine_server_send_fd( int fd ) { -#ifndef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS - struct cmsg_fd cmsg; -#endif struct send_fd data; struct msghdr msghdr; struct iovec vec; int ret; - vec.iov_base = (void *)&data; - vec.iov_len = sizeof(data); - - msghdr.msg_name = NULL; - msghdr.msg_namelen = 0; - msghdr.msg_iov = &vec; - msghdr.msg_iovlen = 1; - #ifdef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS msghdr.msg_accrights = (void *)&fd; msghdr.msg_accrightslen = sizeof(fd); #else /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */ - cmsg.header.len = sizeof(cmsg.header) + sizeof(fd); - cmsg.header.level = SOL_SOCKET; - cmsg.header.type = SCM_RIGHTS; - cmsg.fd = fd; - msghdr.msg_control = &cmsg; - msghdr.msg_controllen = sizeof(cmsg.header) + sizeof(fd); + char cmsg_buffer[256]; + struct cmsghdr *cmsg; + msghdr.msg_control = cmsg_buffer; + msghdr.msg_controllen = sizeof(cmsg_buffer); msghdr.msg_flags = 0; + cmsg = CMSG_FIRSTHDR( &msghdr ); + cmsg->cmsg_len = CMSG_LEN( sizeof(fd) ); + cmsg->cmsg_level = SOL_SOCKET; + cmsg->cmsg_type = SCM_RIGHTS; + *(int *)CMSG_DATA(cmsg) = fd; + msghdr.msg_controllen = cmsg->cmsg_len; #endif /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */ + msghdr.msg_name = NULL; + msghdr.msg_namelen = 0; + msghdr.msg_iov = &vec; + msghdr.msg_iovlen = 1; + + vec.iov_base = (void *)&data; + vec.iov_len = sizeof(data); + data.tid = GetCurrentThreadId(); data.fd = fd; @@ -385,24 +372,16 @@ void CDECL wine_server_send_fd( int fd ) static int receive_fd( obj_handle_t *handle ) { struct iovec vec; - int ret, fd; - -#ifdef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS struct msghdr msghdr; + int ret, fd = -1; - fd = -1; +#ifdef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS msghdr.msg_accrights = (void *)&fd; msghdr.msg_accrightslen = sizeof(fd); #else /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */ - struct msghdr msghdr; - struct cmsg_fd cmsg; - - cmsg.header.len = sizeof(cmsg.header) + sizeof(fd); - cmsg.header.level = SOL_SOCKET; - cmsg.header.type = SCM_RIGHTS; - cmsg.fd = -1; - msghdr.msg_control = &cmsg; - msghdr.msg_controllen = sizeof(cmsg.header) + sizeof(fd); + char cmsg_buffer[256]; + msghdr.msg_control = cmsg_buffer; + msghdr.msg_controllen = sizeof(cmsg_buffer); msghdr.msg_flags = 0; #endif /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */ @@ -418,8 +397,13 @@ static int receive_fd( obj_handle_t *handle ) if ((ret = recvmsg( fd_socket, &msghdr, MSG_CMSG_CLOEXEC )) > 0) { #ifndef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS - fd = cmsg.fd; -#endif + struct cmsghdr *cmsg; + for (cmsg = CMSG_FIRSTHDR( &msghdr ); cmsg; cmsg = CMSG_NXTHDR( &msghdr, cmsg )) + { + if (cmsg->cmsg_level != SOL_SOCKET) continue; + if (cmsg->cmsg_type == SCM_RIGHTS) fd = *(int *)CMSG_DATA(cmsg); + } +#endif /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */ if (fd != -1) fcntl( fd, F_SETFD, FD_CLOEXEC ); /* in case MSG_CMSG_CLOEXEC is not supported */ return fd; } diff --git a/server/request.c b/server/request.c index d2aebb3..cea23ef 100644 --- a/server/request.c +++ b/server/request.c @@ -126,23 +126,6 @@ int config_dir_fd = -1; /* file descriptor for the config dir */ static struct master_socket *master_socket; /* the master socket object */ static struct timeout_user *master_timeout; -/* socket communication static structures */ -static struct iovec myiovec; -static struct msghdr msghdr; -#ifndef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS -struct cmsg_fd -{ - struct - { - size_t len; /* size of structure */ - int level; /* SOL_SOCKET */ - int type; /* SCM_RIGHTS */ - } header; - int fd; /* fd to pass */ -}; -static struct cmsg_fd cmsg = { { sizeof(cmsg.header) + sizeof(cmsg.fd), SOL_SOCKET, SCM_RIGHTS }, -1 }; -#endif /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */ - /* complain about a protocol error and terminate the client connection */ void fatal_protocol_error( struct thread *thread, const char *err, ... ) { @@ -359,25 +342,41 @@ error: /* receive a file descriptor on the process socket */ int receive_fd( struct process *process ) { + struct iovec vec; struct send_fd data; - int fd, ret; + struct msghdr msghdr; + int fd = -1, ret; #ifdef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS msghdr.msg_accrightslen = sizeof(int); msghdr.msg_accrights = (void *)&fd; #else /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */ - msghdr.msg_control = &cmsg; - msghdr.msg_controllen = sizeof(cmsg.header) + sizeof(fd); - cmsg.fd = -1; + char cmsg_buffer[256]; + msghdr.msg_control = cmsg_buffer; + msghdr.msg_controllen = sizeof(cmsg_buffer); + msghdr.msg_flags = 0; #endif /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */ - myiovec.iov_base = (void *)&data; - myiovec.iov_len = sizeof(data); + msghdr.msg_name = NULL; + msghdr.msg_namelen = 0; + msghdr.msg_iov = &vec; + msghdr.msg_iovlen = 1; + vec.iov_base = (void *)&data; + vec.iov_len = sizeof(data); ret = recvmsg( get_unix_fd( process->msg_fd ), &msghdr, 0 ); + #ifndef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS - fd = cmsg.fd; -#endif + if (ret > 0) + { + struct cmsghdr *cmsg; + for (cmsg = CMSG_FIRSTHDR( &msghdr ); cmsg; cmsg = CMSG_NXTHDR( &msghdr, cmsg )) + { + if (cmsg->cmsg_level != SOL_SOCKET) continue; + if (cmsg->cmsg_type == SCM_RIGHTS) fd = *(int *)CMSG_DATA(cmsg); + } + } +#endif /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */ if (ret == sizeof(data)) { @@ -412,6 +411,7 @@ int receive_fd( struct process *process ) { fprintf( stderr, "Protocol error: process %04x: partial recvmsg %d for fd\n", process->id, ret ); + if (fd != -1) close( fd ); kill_process( process, 1 ); } else @@ -429,23 +429,37 @@ int receive_fd( struct process *process ) /* send an fd to a client */ int send_client_fd( struct process *process, int fd, obj_handle_t handle ) { + struct iovec vec; + struct msghdr msghdr; int ret; - if (debug_level) - fprintf( stderr, "%04x: *fd* %04x -> %d\n", - current ? current->id : process->id, handle, fd ); - #ifdef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS msghdr.msg_accrightslen = sizeof(fd); msghdr.msg_accrights = (void *)&fd; #else /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */ - msghdr.msg_control = &cmsg; - msghdr.msg_controllen = sizeof(cmsg.header) + sizeof(fd); - cmsg.fd = fd; + char cmsg_buffer[256]; + struct cmsghdr *cmsg; + msghdr.msg_control = cmsg_buffer; + msghdr.msg_controllen = sizeof(cmsg_buffer); + msghdr.msg_flags = 0; + cmsg = CMSG_FIRSTHDR( &msghdr ); + cmsg->cmsg_len = CMSG_LEN( sizeof(fd) ); + cmsg->cmsg_level = SOL_SOCKET; + cmsg->cmsg_type = SCM_RIGHTS; + *(int *)CMSG_DATA(cmsg) = fd; + msghdr.msg_controllen = cmsg->cmsg_len; #endif /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */ - myiovec.iov_base = (void *)&handle; - myiovec.iov_len = sizeof(handle); + msghdr.msg_name = NULL; + msghdr.msg_namelen = 0; + msghdr.msg_iov = &vec; + msghdr.msg_iovlen = 1; + + vec.iov_base = (void *)&handle; + vec.iov_len = sizeof(handle); + + if (debug_level) + fprintf( stderr, "%04x: *fd* %04x -> %d\n", current ? current->id : process->id, handle, fd ); ret = sendmsg( get_unix_fd( process->msg_fd ), &msghdr, 0 ); @@ -797,12 +811,6 @@ void open_master_socket(void) acquire_lock(); } - /* setup msghdr structure constant fields */ - msghdr.msg_name = NULL; - msghdr.msg_namelen = 0; - msghdr.msg_iov = &myiovec; - msghdr.msg_iovlen = 1; - /* init the process tracing mechanism */ init_tracing_mechanism(); }
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Alexandre Julliard