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file: Log closing filedescriptors

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EBADF errors are logged as warnings as they normally indicate a double
close bug. This patch also provides VIR_MASS_CLOSE helper to be user in
the only case of mass close after fork when EBADF should rather be
ignored.
This commit is contained in:
Jiri Denemark 2012-05-30 15:54:18 +02:00
parent 461ed4210f
commit dfd4584317
3 changed files with 32 additions and 12 deletions
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2
src/util/command.c
View File

@ -529,7 +529,7 @@ virExecWithHook(const char *const*argv,
continue;
if (!keepfd || !virCommandFDIsSet(i, keepfd, keepfd_size)) {
tmpfd = i;
VIR_FORCE_CLOSE(tmpfd);
VIR_MASS_CLOSE(tmpfd);
} else if (virSetInherit(i, true) < 0) {
virReportSystemError(errno, _("failed to preserve fd %d"), i);
goto fork_error;

31
src/util/virfile.c
View File

@ -35,6 +35,7 @@
#include "configmake.h"
#include "memory.h"
#include "virterror_internal.h"
#include "logging.h"
#define VIR_FROM_THIS VIR_FROM_NONE
#define virFileError(code, ...) \
@ -42,19 +43,33 @@
__FUNCTION__, __LINE__, __VA_ARGS__)
int virFileClose(int *fdptr, bool preserve_errno)
int virFileClose(int *fdptr, bool preserve_errno, bool ignore_EBADF)
{
int saved_errno = 0;
int rc = 0;
if (*fdptr >= 0) {
if (preserve_errno)
saved_errno = errno;
rc = close(*fdptr);
*fdptr = -1;
if (preserve_errno)
errno = saved_errno;
if (*fdptr < 0)
return 0;
if (preserve_errno)
saved_errno = errno;
rc = close(*fdptr);
if (rc < 0) {
if (errno == EBADF) {
if (!ignore_EBADF)
VIR_WARN("Tried to close invalid fd %d", *fdptr);
} else {
char ebuf[1024] ATTRIBUTE_UNUSED;
VIR_DEBUG("Failed to close fd %d: %s",
*fdptr, virStrerror(errno, ebuf, sizeof(ebuf)));
}
} else {
VIR_DEBUG("Closed fd %d", *fdptr);
}
*fdptr = -1;
if (preserve_errno)
errno = saved_errno;
return rc;
}

11
src/util/virfile.h
View File

@ -33,13 +33,14 @@
/* Don't call these directly - use the macros below */
int virFileClose(int *fdptr, bool preserve_errno) ATTRIBUTE_RETURN_CHECK;
int virFileClose(int *fdptr, bool preserve_errno, bool ignore_EBADF)
ATTRIBUTE_RETURN_CHECK;
int virFileFclose(FILE **file, bool preserve_errno) ATTRIBUTE_RETURN_CHECK;
FILE *virFileFdopen(int *fdptr, const char *mode) ATTRIBUTE_RETURN_CHECK;
/* For use on normal paths; caller must check return value,
and failure sets errno per close. */
# define VIR_CLOSE(FD) virFileClose(&(FD), false)
# define VIR_CLOSE(FD) virFileClose(&(FD), false, false)
# define VIR_FCLOSE(FILE) virFileFclose(&(FILE), false)
/* Wrapper around fdopen that consumes fd on success. */
@ -47,9 +48,13 @@ FILE *virFileFdopen(int *fdptr, const char *mode) ATTRIBUTE_RETURN_CHECK;
/* For use on cleanup paths; errno is unaffected by close,
and no return value to worry about. */
# define VIR_FORCE_CLOSE(FD) ignore_value(virFileClose(&(FD), true))
# define VIR_FORCE_CLOSE(FD) ignore_value(virFileClose(&(FD), true, false))
# define VIR_FORCE_FCLOSE(FILE) ignore_value(virFileFclose(&(FILE), true))
/* Similar VIR_FORCE_CLOSE() but ignores EBADF errors since they are expected
* during mass close after fork(). */
# define VIR_MASS_CLOSE(FD) ignore_value(virFileClose(&(FD), true, true))
/* Opaque type for managing a wrapper around a fd. */
struct _virFileWrapperFd;