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[Libvir] [PATCH] 1/2: Move safewrite and saferead to a separate file.



Move safewrite and saferead to a separate file.

We currently use safewrite from inside libvirt and don't want to publish
any such function name.  However, we do want to use it in applications
like virsh, libvirtd and libvirt_proxy that link with libvirt.  To that
end, this change moves that function definition (along with the nearly
identical saferead) into a new file, util-lib.c.  To avoid maintaining
separate copies of even such small functions, we simply include that new
file from util.c.  Then, the separate applications that need to use
safewrite simply compile and link with util-lib.c.

Of course, this does mean that each of those applications will
containing two copies of these functions.  However, the functions
are so small that it's not worth worrying about that.

* src/util.c (saferead, safewrite): Move function definitions to
util-lib.c and include that .c file.
* src/util-lib.c (saferead, safewrite): New file.  Functions from src/util.c
with slight change (s/int r =/ssize_t r =/) to reflect read/write return type.
* src/util-lib.h: Declare the two moved functions.
* src/util.h: Remove declarations.  Include src/util-lib.h.
* proxy/Makefile.am (libvirt_proxy_SOURCES): Add src/util-lib.c.
* qemud/Makefile.am (libvirtd_SOURCES): Likewise.
* src/Makefile.am (virsh_SOURCES): Add util-lib.c.  Remove some SP-before-TAB.

Signed-off-by: Jim Meyering <meyering redhat com>
---
 proxy/Makefile.am     |    6 +++-
 proxy/libvirt_proxy.c |   16 ++++----------
 qemud/Makefile.am     |    3 +-
 src/Makefile.am       |   16 +++++++-------
 src/util-lib.c        |   52 +++++++++++++++++++++++++++++++++++++++++++++++++
 src/util-lib.h        |   16 +++++++++++++++
 src/util.c            |   43 ++-------------------------------------
 src/util.h            |   10 ++++----
 8 files changed, 95 insertions(+), 67 deletions(-)
 create mode 100644 src/util-lib.c
 create mode 100644 src/util-lib.h

diff --git a/proxy/Makefile.am b/proxy/Makefile.am
index ff9a3eb..68e3317 100644
--- a/proxy/Makefile.am
+++ b/proxy/Makefile.am
@@ -12,11 +12,13 @@ libexec_PROGRAMS = libvirt_proxy
 libvirt_proxy_SOURCES = libvirt_proxy.c @top_srcdir@/src/xend_internal.c \
 	    @top_srcdir@/src/xen_internal.c @top_srcdir@/src/virterror.c \
 	    @top_srcdir@/src/sexpr.c @top_srcdir@/src/xml.c \
-            @top_srcdir@/src/xs_internal.c @top_srcdir@/src/buf.c @top_srcdir@/src/uuid.c
+            @top_srcdir@/src/xs_internal.c @top_srcdir@/src/buf.c \
+            @top_srcdir@/src/util-lib.c \
+	    @top_srcdir@/src/uuid.c
 libvirt_proxy_LDFLAGS = $(WARN_CFLAGS)
 libvirt_proxy_DEPENDENCIES =
 libvirt_proxy_LDADD =

 install-exec-hook:
 	chmod u+s $(DESTDIR)$(libexecdir)/libvirt_proxy
-endif
\ No newline at end of file
+endif
diff --git a/proxy/libvirt_proxy.c b/proxy/libvirt_proxy.c
index d96d3db..a22ba6c 100644
--- a/proxy/libvirt_proxy.c
+++ b/proxy/libvirt_proxy.c
@@ -2,7 +2,7 @@
  * proxy_svr.c: root suid proxy server for Xen access to APIs with no
  *              side effects from unauthenticated clients.
  *
- * Copyright (C) 2006, 2007 Red Hat, Inc.
+ * Copyright (C) 2006, 2007, 2008 Red Hat, Inc.
  *
  * See COPYING.LIB for the License of this software
  *
@@ -26,6 +26,7 @@
 #include "internal.h"

 #include "proxy_internal.h"
+#include "util.h"
 #include "xen_internal.h"
 #include "xend_internal.h"
 #include "xs_internal.h"
@@ -317,19 +318,12 @@ proxyWriteClientSocket(int nr, virProxyPacketPtr req) {
 	return(-1);
     }

-retry:
-    ret = write(pollInfos[nr].fd, (char *) req, req->len);
+    ret = safewrite(pollInfos[nr].fd, (char *) req, req->len);
     if (ret < 0) {
-        if (errno == EINTR) {
-	    if (debug > 0)
-	        fprintf(stderr, "write socket %d to client %d interrupted\n",
-		        pollInfos[nr].fd, nr);
-	    goto retry;
-	}
         fprintf(stderr, "write %d bytes to socket %d from client %d failed\n",
 	        req->len, pollInfos[nr].fd, nr);
-	proxyCloseClientSocket(nr);
-	return(-1);
+        proxyCloseClientSocket(nr);
+        return(-1);
     }
     if (ret == 0) {
 	if (debug)
diff --git a/qemud/Makefile.am b/qemud/Makefile.am
index db6adb1..1e1f861 100644
--- a/qemud/Makefile.am
+++ b/qemud/Makefile.am
@@ -42,6 +42,7 @@ libvirtd_SOURCES = \
 		qemud.c internal.h \
 		remote_protocol.h remote_protocol.c \
 		remote.c \
+		$(srcdir)/../src/util-lib.c \
 		event.c event.h

 #-D_XOPEN_SOURCE=600 -D_XOPEN_SOURCE_EXTENDED=1 -D_POSIX_C_SOURCE=199506L
@@ -151,4 +152,4 @@ uninstall-init:

 endif # DBUS_INIT_SCRIPTS_RED_HAT

-endif # WITH_LIBVIRTD
\ No newline at end of file
+endif # WITH_LIBVIRTD
diff --git a/src/Makefile.am b/src/Makefile.am
index 7bbf816..1da0d73 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -51,21 +51,21 @@ CLIENT_SOURCES =						\
 		conf.c conf.h                                   \
 		xm_internal.c xm_internal.h                     \
 		remote_internal.c remote_internal.h		\
-		bridge.c bridge.h 				\
-		iptables.c iptables.h 				\
-		uuid.c uuid.h 					\
-		qemu_driver.c qemu_driver.h 			\
+		bridge.c bridge.h				\
+		iptables.c iptables.h				\
+		uuid.c uuid.h					\
+		qemu_driver.c qemu_driver.h			\
 		qemu_conf.c qemu_conf.h				\
 		openvz_conf.c openvz_conf.h			\
-		openvz_driver.c openvz_driver.h 		\
+		openvz_driver.c openvz_driver.h			\
                 nodeinfo.h nodeinfo.c                           \
 		storage_conf.h storage_conf.c			\
 		storage_driver.h storage_driver.c		\
 		storage_backend.h storage_backend.c		\
-		storage_backend_fs.h storage_backend_fs.c 	\
+		storage_backend_fs.h storage_backend_fs.c	\
 		util.c util.h

-SERVER_SOURCES = 						\
+SERVER_SOURCES =						\
 		../qemud/remote_protocol.c ../qemud/remote_protocol.h

 if WITH_STORAGE_LVM
@@ -100,7 +100,7 @@ libvirt_la_CFLAGS = $(COVERAGE_CFLAGS)

 bin_PROGRAMS = virsh

-virsh_SOURCES = virsh.c console.c console.h
+virsh_SOURCES = virsh.c console.c console.h util-lib.c
 virsh_LDFLAGS = $(WARN_CFLAGS) $(COVERAGE_LDFLAGS)
 virsh_DEPENDENCIES = $(DEPS)
 virsh_LDADD = $(LDADDS) $(VIRSH_LIBS)
diff --git a/src/util-lib.c b/src/util-lib.c
new file mode 100644
index 0000000..92496cd
--- /dev/null
+++ b/src/util-lib.c
@@ -0,0 +1,52 @@
+/*
+ * common, generic utility functions
+ *
+ * Copyright (C) 2006, 2007, 2008 Red Hat, Inc.
+ * See COPYING.LIB for the License of this software
+ */
+
+#include <config.h>
+
+#include <unistd.h>
+#include <errno.h>
+
+#include "util-lib.h"
+
+/* Like read(), but restarts after EINTR */
+int saferead(int fd, void *buf, size_t count)
+{
+	size_t nread = 0;
+	while (count > 0) {
+		ssize_t r = read(fd, buf, count);
+		if (r < 0 && errno == EINTR)
+			continue;
+		if (r < 0)
+			return r;
+		if (r == 0)
+			return nread;
+		buf = (char *)buf + r;
+		count -= r;
+		nread += r;
+	}
+	return nread;
+}
+
+/* Like write(), but restarts after EINTR */
+ssize_t safewrite(int fd, const void *buf, size_t count)
+{
+	size_t nwritten = 0;
+	while (count > 0) {
+		ssize_t r = write(fd, buf, count);
+
+		if (r < 0 && errno == EINTR)
+			continue;
+		if (r < 0)
+			return r;
+		if (r == 0)
+			return nwritten;
+		buf = (const char *)buf + r;
+		count -= r;
+		nwritten += r;
+	}
+	return nwritten;
+}
diff --git a/src/util-lib.h b/src/util-lib.h
new file mode 100644
index 0000000..4a14810
--- /dev/null
+++ b/src/util-lib.h
@@ -0,0 +1,16 @@
+/*
+ * private utility functions
+ *
+ * Copyright (C) 2008 Red Hat, Inc.
+ * See COPYING.LIB for the License of this software
+ */
+
+#ifndef __UTIL_LIB_H__
+#define __UTIL_LIB_H__
+
+#include <sys/types.h>
+
+int saferead(int fd, void *buf, size_t count);
+ssize_t safewrite(int fd, const void *buf, size_t count);
+
+#endif
diff --git a/src/util.c b/src/util.c
index 19131a7..67cb0b8 100644
--- a/src/util.c
+++ b/src/util.c
@@ -1,7 +1,7 @@
 /*
  * utils.c: common, generic utility functions
  *
- * Copyright (C) 2006, 2007 Red Hat, Inc.
+ * Copyright (C) 2006, 2007, 2008 Red Hat, Inc.
  * Copyright (C) 2006 Daniel P. Berrange
  * Copyright (C) 2006, 2007 Binary Karma
  * Copyright (C) 2006 Shuveb Hussain
@@ -46,6 +46,8 @@
 #include "buf.h"
 #include "util.h"

+#include "util-lib.c"
+
 #define MAX_ERROR_LEN   1024

 #define virLog(msg...) fprintf(stderr, msg)
@@ -276,45 +278,6 @@ virExecNonBlock(virConnectPtr conn,

 #endif /* __MINGW32__ */

-/* Like read(), but restarts after EINTR */
-int saferead(int fd, void *buf, size_t count)
-{
-	size_t nread = 0;
-	while (count > 0) {
-		int r = read(fd, buf, count);
-		if (r < 0 && errno == EINTR)
-			continue;
-		if (r < 0)
-			return r;
-		if (r == 0)
-			return nread;
-		buf = (unsigned char *)buf + r;
-		count -= r;
-		nread += r;
-	}
-	return nread;
-}
-
-/* Like write(), but restarts after EINTR */
-ssize_t safewrite(int fd, const void *buf, size_t count)
-{
-	size_t nwritten = 0;
-	while (count > 0) {
-		int r = write(fd, buf, count);
-
-		if (r < 0 && errno == EINTR)
-			continue;
-		if (r < 0)
-			return r;
-		if (r == 0)
-			return nwritten;
-		buf = (unsigned char *)buf + r;
-		count -= r;
-		nwritten += r;
-	}
-	return nwritten;
-}
-

 int __virFileReadAll(const char *path,
                      int maxlen,
diff --git a/src/util.h b/src/util.h
index 7080ed0..23a016d 100644
--- a/src/util.h
+++ b/src/util.h
@@ -25,14 +25,14 @@
 #define __VIR_UTIL_H__

 #include "internal.h"
+#include "util-lib.h"

-int virExec(virConnectPtr conn, char **argv, int *retpid, int infd, int *outfd, int *errfd);
-int virExecNonBlock(virConnectPtr conn, char **argv, int *retpid, int infd, int *outfd, int *errfd);
+int virExec(virConnectPtr conn, char **argv, int *retpid,
+	    int infd, int *outfd, int *errfd);
+int virExecNonBlock(virConnectPtr conn, char **argv, int *retpid,
+		    int infd, int *outfd, int *errfd);
 int virRun(virConnectPtr conn, char **argv, int *status);

-int saferead(int fd, void *buf, size_t count);
-ssize_t safewrite(int fd, const void *buf, size_t count);
-
 int __virFileReadAll(const char *path,
 		     int maxlen,
 		     char **buf);
--
1.5.4.2.185.gf5f8


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