On Wed, Apr 25, 2012 at 01:21:14PM +0800, Amos Kong wrote: > Add a bool argument to inet_connect() to assign if set socket > to block/nonblock, and delete original argument 'socktype' > that is unused. > Add a new argument to inet_connect()/inet_connect_opts(), > to pass back connect error by error class. > > Retry to connect when -EINTR is got. Connect's successful > for nonblock socket when following errors are got, user > should wait for connecting by select(): > -EINPROGRESS > -EWOULDBLOCK (win32) > -WSAEALREADY (win32) > > Change nbd, vnc to use new interface. > > --- > Changes from v7: > - posix: let EWOULDBLOCK fall through to CONNECT_FAILED path > - fix typo > > Changes from v8: > - reuse rc variable > - fix a NULL pointer dereference > > Changes from v9: > - handle non-blocking correctly if errp is NULL > > Signed-off-by: Amos Kong <ak...@redhat.com>
Reviewed-by: Michael Roth <mdr...@linux.vnet.ibm.com> > --- > nbd.c | 2 +- > qemu-char.c | 2 +- > qemu-sockets.c | 43 +++++++++++++++++++++++++++++++++++++------ > qemu_socket.h | 6 ++++-- > ui/vnc.c | 2 +- > 5 files changed, 44 insertions(+), 11 deletions(-) > > diff --git a/nbd.c b/nbd.c > index 406e555..bb71f00 100644 > --- a/nbd.c > +++ b/nbd.c > @@ -146,7 +146,7 @@ int tcp_socket_outgoing(const char *address, uint16_t > port) > > int tcp_socket_outgoing_spec(const char *address_and_port) > { > - return inet_connect(address_and_port, SOCK_STREAM); > + return inet_connect(address_and_port, true, NULL); > } > > int tcp_socket_incoming(const char *address, uint16_t port) > diff --git a/qemu-char.c b/qemu-char.c > index 74c60e1..aeee2e8 100644 > --- a/qemu-char.c > +++ b/qemu-char.c > @@ -2444,7 +2444,7 @@ static CharDriverState *qemu_chr_open_socket(QemuOpts > *opts) > if (is_listen) { > fd = inet_listen_opts(opts, 0); > } else { > - fd = inet_connect_opts(opts); > + fd = inet_connect_opts(opts, NULL); > } > } > if (fd < 0) { > diff --git a/qemu-sockets.c b/qemu-sockets.c > index 6bcb8e3..ce3f06c 100644 > --- a/qemu-sockets.c > +++ b/qemu-sockets.c > @@ -51,6 +51,9 @@ static QemuOptsList dummy_opts = { > },{ > .name = "ipv6", > .type = QEMU_OPT_BOOL, > + },{ > + .name = "block", > + .type = QEMU_OPT_BOOL, > }, > { /* end if list */ } > }, > @@ -194,7 +197,7 @@ listen: > return slisten; > } > > -int inet_connect_opts(QemuOpts *opts) > +int inet_connect_opts(QemuOpts *opts, Error **errp) > { > struct addrinfo ai,*res,*e; > const char *addr; > @@ -202,6 +205,7 @@ int inet_connect_opts(QemuOpts *opts) > char uaddr[INET6_ADDRSTRLEN+1]; > char uport[33]; > int sock,rc; > + bool block; > > memset(&ai,0, sizeof(ai)); > ai.ai_flags = AI_CANONNAME | AI_ADDRCONFIG; > @@ -210,8 +214,10 @@ int inet_connect_opts(QemuOpts *opts) > > addr = qemu_opt_get(opts, "host"); > port = qemu_opt_get(opts, "port"); > + block = qemu_opt_get_bool(opts, "block", 0); > if (addr == NULL || port == NULL) { > fprintf(stderr, "inet_connect: host and/or port not specified\n"); > + error_set(errp, QERR_SOCKET_CREATE_FAILED); > return -1; > } > > @@ -224,6 +230,7 @@ int inet_connect_opts(QemuOpts *opts) > if (0 != (rc = getaddrinfo(addr, port, &ai, &res))) { > fprintf(stderr,"getaddrinfo(%s,%s): %s\n", addr, port, > gai_strerror(rc)); > + error_set(errp, QERR_SOCKET_CREATE_FAILED); > return -1; > } > > @@ -241,19 +248,37 @@ int inet_connect_opts(QemuOpts *opts) > continue; > } > setsockopt(sock,SOL_SOCKET,SO_REUSEADDR,(void*)&on,sizeof(on)); > - > + if (!block) { > + socket_set_nonblock(sock); > + } > /* connect to peer */ > - if (connect(sock,e->ai_addr,e->ai_addrlen) < 0) { > + do { > + rc = 0; > + if (connect(sock, e->ai_addr, e->ai_addrlen) < 0) { > + rc = -socket_error(); > + } > + } while (rc == -EINTR); > + > + #ifdef _WIN32 > + if (!block && (rc == -EINPROGRESS || rc == -EWOULDBLOCK > + || rc == -WSAEALREADY)) { > + #else > + if (!block && (rc == -EINPROGRESS)) { > + #endif > + error_set(errp, QERR_SOCKET_CONNECT_IN_PROGRESS); > + } else if (rc < 0) { > if (NULL == e->ai_next) > fprintf(stderr, "%s: connect(%s,%s,%s,%s): %s\n", > __FUNCTION__, > inet_strfamily(e->ai_family), > e->ai_canonname, uaddr, uport, strerror(errno)); > closesocket(sock); > + sock = -1; > continue; > } > freeaddrinfo(res); > return sock; > } > + error_set(errp, QERR_SOCKET_CONNECT_FAILED); > freeaddrinfo(res); > return -1; > } > @@ -449,14 +474,20 @@ int inet_listen(const char *str, char *ostr, int olen, > return sock; > } > > -int inet_connect(const char *str, int socktype) > +int inet_connect(const char *str, bool block, Error **errp) > { > QemuOpts *opts; > int sock = -1; > > opts = qemu_opts_create(&dummy_opts, NULL, 0); > - if (inet_parse(opts, str) == 0) > - sock = inet_connect_opts(opts); > + if (inet_parse(opts, str) == 0) { > + if (block) { > + qemu_opt_set(opts, "block", "on"); > + } > + sock = inet_connect_opts(opts, errp); > + } else { > + error_set(errp, QERR_SOCKET_CREATE_FAILED); > + } > qemu_opts_del(opts); > return sock; > } > diff --git a/qemu_socket.h b/qemu_socket.h > index a5d0a84..26998ef 100644 > --- a/qemu_socket.h > +++ b/qemu_socket.h > @@ -27,6 +27,8 @@ int inet_aton(const char *cp, struct in_addr *ia); > #endif /* !_WIN32 */ > > #include "qemu-option.h" > +#include "error.h" > +#include "qerror.h" > > /* misc helpers */ > int qemu_socket(int domain, int type, int protocol); > @@ -40,8 +42,8 @@ int send_all(int fd, const void *buf, int len1); > int inet_listen_opts(QemuOpts *opts, int port_offset); > int inet_listen(const char *str, char *ostr, int olen, > int socktype, int port_offset); > -int inet_connect_opts(QemuOpts *opts); > -int inet_connect(const char *str, int socktype); > +int inet_connect_opts(QemuOpts *opts, Error **errp); > +int inet_connect(const char *str, bool block, Error **errp); > int inet_dgram_opts(QemuOpts *opts); > const char *inet_strfamily(int family); > > diff --git a/ui/vnc.c b/ui/vnc.c > index deb9ecd..3ae7704 100644 > --- a/ui/vnc.c > +++ b/ui/vnc.c > @@ -3068,7 +3068,7 @@ int vnc_display_open(DisplayState *ds, const char > *display) > if (strncmp(display, "unix:", 5) == 0) > vs->lsock = unix_connect(display+5); > else > - vs->lsock = inet_connect(display, SOCK_STREAM); > + vs->lsock = inet_connect(display, true, NULL); > if (-1 == vs->lsock) { > g_free(vs->display); > vs->display = NULL; > >