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[Qemu-devel] [PATCH v3 2/5] add qemu_fopen_err
From: |
Alon Levy |
Subject: |
[Qemu-devel] [PATCH v3 2/5] add qemu_fopen_err |
Date: |
Sun, 18 Mar 2012 19:29:10 +0100 |
This adds a helper to conveniently set the correct error based on the
errno after a failed fopen.
The added function is placed in it's own c file to allow libcacard to
not develop dependencies on everything that qerror will bring in, which
includes monitor and half of qemu. I tried to make it as less ugly as I
could, by naming an osdep-no-qerror-obj-y and having that included in
osdep-obj-y, and using only the former for libcacard.
Signed-off-by: Alon Levy <address@hidden>
---
Makefile.objs | 8 +++++---
libcacard/Makefile | 2 +-
osdep-qerror.c | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++++
osdep-qerror.h | 8 ++++++++
osdep.c | 1 -
5 files changed, 66 insertions(+), 5 deletions(-)
create mode 100644 osdep-qerror.c
create mode 100644 osdep-qerror.h
diff --git a/Makefile.objs b/Makefile.objs
index 226b01d..fb5a73a 100644
--- a/Makefile.objs
+++ b/Makefile.objs
@@ -20,9 +20,11 @@ universal-obj-y += $(qom-obj-y)
#######################################################################
# oslib-obj-y is code depending on the OS (win32 vs posix)
-oslib-obj-y = osdep.o
-oslib-obj-$(CONFIG_WIN32) += oslib-win32.o qemu-thread-win32.o
-oslib-obj-$(CONFIG_POSIX) += oslib-posix.o qemu-thread-posix.o
+oslib-no-qerror-obj-y = osdep.o
+oslib-no-qerror-obj-$(CONFIG_WIN32) += oslib-win32.o qemu-thread-win32.o
+oslib-no-qerror-obj-$(CONFIG_POSIX) += oslib-posix.o qemu-thread-posix.o
+oslib-obj-y = $(oslib-no-qerror-obj-y)
+oslib-obj-y += osdep-qerror.o
#######################################################################
# coroutines
diff --git a/libcacard/Makefile b/libcacard/Makefile
index c6a896a..83f483f 100644
--- a/libcacard/Makefile
+++ b/libcacard/Makefile
@@ -8,7 +8,7 @@ libcacard_includedir=$(includedir)/cacard
$(call set-vpath, $(SRC_PATH):$(libcacard_srcpath))
# objects linked against normal qemu binaries, not compiled with libtool
-QEMU_OBJS=$(addprefix ../,$(oslib-obj-y) qemu-timer-common.o $(trace-obj-y))
+QEMU_OBJS=$(addprefix ../,$(oslib-no-qerror-obj-y) qemu-timer-common.o
$(trace-obj-y))
# objects linked into a shared library, built with libtool with -fPIC if
required
QEMU_OBJS_LIB=$(addsuffix .lo,$(basename $(QEMU_OBJS)))
diff --git a/osdep-qerror.c b/osdep-qerror.c
new file mode 100644
index 0000000..6dac984
--- /dev/null
+++ b/osdep-qerror.c
@@ -0,0 +1,52 @@
+#include "qerror.h"
+
+#include "osdep-qerror.h"
+
+/*
+ * Helper to set an Error after a failed fopen.
+ *
+ * Uses errno so it must not be changed by another intermediate call.
+ */
+void qemu_fopen_err(Error **errp, const char *file_name)
+{
+ const char *fmt = NULL;
+
+ switch (errno) {
+ case EACCES:
+ fmt = QERR_EACCES;
+ break;
+ case EINTR:
+ fmt = QERR_EINTR;
+ break;
+ case EEXIST:
+ fmt = QERR_EEXIST;
+ break;
+ case EMFILE:
+ fmt = QERR_OPEN_FILE_EMFILE;
+ break;
+ case ENOSPC:
+ fmt = QERR_ENOSPC;
+ break;
+ case EPERM:
+ fmt = QERR_EPERM;
+ break;
+ case EROFS:
+ fmt = QERR_READ_ONLY;
+ break;
+ case ENOTDIR:
+ fmt = QERR_ENOTDIR;
+ break;
+ case EFBIG:
+ fmt = QERR_EFBIG;
+ break;
+ default:
+ /*
+ * EINVAL and ENOTSUP will result in the default
+ *
+ * ENOENT too, it's used by (for instance) bdrv_create_file for
+ * a different purpose then open (2) so just give a generic error.
+ */
+ fmt = QERR_OPEN_FILE_FAILED;
+ }
+ error_set(errp, fmt, file_name);
+}
diff --git a/osdep-qerror.h b/osdep-qerror.h
new file mode 100644
index 0000000..7320f4a
--- /dev/null
+++ b/osdep-qerror.h
@@ -0,0 +1,8 @@
+#ifndef OSDEP_QERROR_H
+#define OSDEP_QERROR_H
+
+#include "error.h"
+
+void qemu_fopen_err(Error **errp, const char *file_name);
+
+#endif
diff --git a/osdep.c b/osdep.c
index 3e6bada..efdd21c 100644
--- a/osdep.c
+++ b/osdep.c
@@ -241,4 +241,3 @@ ssize_t qemu_recv_full(int fd, void *buf, size_t count, int
flags)
return total;
}
-
--
1.7.9.3
[Qemu-devel] [PATCH v3 1/5] qerror: add error codes for fopen failure, Alon Levy, 2012/03/18
Re: [Qemu-devel] [PATCH v3 1/5] qerror: add error codes for fopen failure, Alon Levy, 2012/03/26