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From fda8fad673053718fdee4b370476f7a2555437c3 Mon Sep 17 00:00:00 2001
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Message-Id: <fda8fad673053718fdee4b370476f7a2555437c3@dist-git>
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From: Shi Lei <shi_lei@massclouds.com>
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Date: Tue, 4 Jun 2019 13:04:24 +0200
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Subject: [PATCH] util: file: introduce VIR_AUTOCLOSE macro to close fd of the
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file automatically
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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Signed-off-by: Shi Lei <shi_lei@massclouds.com>
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(cherry picked from commit 09d35afd2c3058688290d5d818343d0f6aa2dd6e)
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https://bugzilla.redhat.com/show_bug.cgi?id=1641702
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Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
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Message-Id: <e13d3c54954aa3f13bedc3cda5b32723d5212a66.1559646067.git.jdenemar@redhat.com>
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Reviewed-by: Ján Tomko <jtomko@redhat.com>
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---
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src/util/virfile.h | 18 ++++++++++++++++--
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1 file changed, 16 insertions(+), 2 deletions(-)
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diff --git a/src/util/virfile.h b/src/util/virfile.h
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index 51c221e069..fa03269289 100644
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--- a/src/util/virfile.h
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+++ b/src/util/virfile.h
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@@ -53,6 +53,11 @@ int virFileClose(int *fdptr, virFileCloseFlags flags)
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int virFileFclose(FILE **file, bool preserve_errno) ATTRIBUTE_RETURN_CHECK;
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FILE *virFileFdopen(int *fdptr, const char *mode) ATTRIBUTE_RETURN_CHECK;
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+static inline void virForceCloseHelper(int *fd)
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+{
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+ ignore_value(virFileClose(fd, VIR_FILE_CLOSE_PRESERVE_ERRNO));
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+}
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+
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/* For use on normal paths; caller must check return value,
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and failure sets errno per close. */
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# define VIR_CLOSE(FD) virFileClose(&(FD), 0)
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@@ -63,8 +68,7 @@ FILE *virFileFdopen(int *fdptr, const char *mode) ATTRIBUTE_RETURN_CHECK;
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/* For use on cleanup paths; errno is unaffected by close,
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and no return value to worry about. */
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-# define VIR_FORCE_CLOSE(FD) \
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- ignore_value(virFileClose(&(FD), VIR_FILE_CLOSE_PRESERVE_ERRNO))
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+# define VIR_FORCE_CLOSE(FD) virForceCloseHelper(&(FD))
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# define VIR_FORCE_FCLOSE(FILE) ignore_value(virFileFclose(&(FILE), true))
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/* Similar VIR_FORCE_CLOSE() but ignores EBADF errors since they are expected
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@@ -79,6 +83,16 @@ FILE *virFileFdopen(int *fdptr, const char *mode) ATTRIBUTE_RETURN_CHECK;
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VIR_FILE_CLOSE_PRESERVE_ERRNO | \
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VIR_FILE_CLOSE_DONT_LOG))
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+/**
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+ * VIR_AUTOCLOSE:
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+ *
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+ * Macro to automatically force close the fd by calling virForceCloseHelper
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+ * when the fd goes out of scope. It's used to eliminate VIR_FORCE_CLOSE
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+ * in cleanup sections.
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+ */
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+# define VIR_AUTOCLOSE __attribute__((cleanup(virForceCloseHelper))) int
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+
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+
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/* Opaque type for managing a wrapper around a fd. */
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struct _virFileWrapperFd;
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--
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2.21.0
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