debuggers.hg

changeset 22881:4fea7664a6fb

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libxl: correct error path in libxl_userdata_retrieve

Firstly, if libxl_read_file_contents fails, it doesn't really leave
*data and *datalen_r undefined - it leaves them unchanged. Tighten up
the spec for the benefit of libxl_userdata_retrieve.

Secondly, libxl_userdata_retrieve ignored errors, assuming they were
all ENOENT. Instead it should fail on unexpected errors.

Signed-off-by: Ian Jackson <ian.jackson@eu.citrix.com>
Acked-by: Jim Fehlig <jfehlig@novell.com>
Committed-by: Ian Jackson <ian.jackson@eu.citrix.com>
author Ian Jackson <ian.jackson@eu.citrix.com>
date Fri Jan 28 16:43:53 2011 +0000 (2011-01-28)
parents 722f7b7678dc
children 2831c5c08df9
files tools/libxl/libxl_dom.c tools/libxl/libxl_utils.h
line diff
     1.1 --- a/tools/libxl/libxl_dom.c	Fri Jan 28 11:08:49 2011 +0000
     1.2 +++ b/tools/libxl/libxl_dom.c	Fri Jan 28 16:43:53 2011 +0000
     1.3 @@ -671,7 +671,10 @@ int libxl_userdata_retrieve(libxl_ctx *c
     1.4      }
     1.5  
     1.6      e = libxl_read_file_contents(ctx, filename, data_r ? &data : 0, &datalen);
     1.7 -
     1.8 +    if (e && errno != ENOENT) {
     1.9 +        rc = ERROR_FAIL;
    1.10 +        goto out;
    1.11 +    }
    1.12      if (!e && !datalen) {
    1.13          LIBXL__LOG(ctx, LIBXL__LOG_ERROR, "userdata file %s is empty", filename);
    1.14          if (data_r) assert(!*data_r);

     2.1 --- a/tools/libxl/libxl_utils.h	Fri Jan 28 11:08:49 2011 +0000
     2.2 +++ b/tools/libxl/libxl_utils.h	Fri Jan 28 16:43:53 2011 +0000
     2.3 @@ -36,7 +36,7 @@ int libxl_read_file_contents(libxl_ctx *
     2.4    /* Reads the contents of the plain file filename into a mallocd
     2.5     * buffer.  Returns 0 or errno.  Any errors other than ENOENT are logged.
     2.6     * If the file is empty, *data_r and *datalen_r are set to 0.
     2.7 -   * On error, *data_r and *datalen_r are undefined.
     2.8 +   * On error, *data_r and *datalen_r are unchanged.
     2.9     * data_r and/or datalen_r may be 0.
    2.10     */
    2.11