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error: add error_set_errno and error_setg_errno

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These functions help maintaining homogeneous formatting of error
messages that include strerror values.

Acked-by: Luiz Capitulino <lcapitulino@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2012-10-02 09:00:45 +02:00
parent da124e62de
commit 680d16dcb7
2 changed files with 37 additions and 0 deletions
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28
error.c
View File

@ -43,6 +43,34 @@ void error_set(Error **errp, ErrorClass err_class, const char *fmt, ...)
*errp = err;
}
void error_set_errno(Error **errp, int os_errno, ErrorClass err_class,
const char *fmt, ...)
{
Error *err;
char *msg1;
va_list ap;
if (errp == NULL) {
return;
}
assert(*errp == NULL);
err = g_malloc0(sizeof(*err));
va_start(ap, fmt);
msg1 = g_strdup_vprintf(fmt, ap);
if (os_errno != 0) {
err->msg = g_strdup_printf("%s: %s", msg1, strerror(os_errno));
g_free(msg1);
} else {
err->msg = msg1;
}
va_end(ap);
err->err_class = err_class;
*errp = err;
}
Error *error_copy(const Error *err)
{
Error *err_new;

9
error.h
View File

@ -29,11 +29,20 @@ typedef struct Error Error;
*/
void error_set(Error **err, ErrorClass err_class, const char *fmt, ...) GCC_FMT_ATTR(3, 4);
/**
* Set an indirect pointer to an error given a ErrorClass value and a
* printf-style human message, followed by a strerror() string if
* @os_error is not zero.
*/
void error_set_errno(Error **err, int os_error, ErrorClass err_class, const char *fmt, ...) GCC_FMT_ATTR(4, 5);
/**
* Same as error_set(), but sets a generic error
*/
#define error_setg(err, fmt, ...) \
error_set(err, ERROR_CLASS_GENERIC_ERROR, fmt, ## __VA_ARGS__)
#define error_setg_errno(err, os_error, fmt, ...) \
error_set_errno(err, os_error, ERROR_CLASS_GENERIC_ERROR, fmt, ## __VA_ARGS__)
/**
* Returns true if an indirect pointer to an error is pointing to a valid