Since commit 50b7b00
, we have error_append_hint() to conveniently
accumulate Error member @hint. error_report_err() prints it with a
newline appended. Consequently, users of error_append_hint() need to
know whether theirs is the final line of the hint to decide whether it
needs a newline. Not a nice interface.
Change error_report_err() to print just the hint, and the (still few)
users of error_append_hint() to add the required newline.
Cc: Eric Blake <eblake@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-Id: <1450370121-5768-7-git-send-email-armbru@redhat.com>
242 lines
5.2 KiB
C
242 lines
5.2 KiB
C
/*
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* QEMU Error Objects
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*
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* Copyright IBM, Corp. 2011
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* Copyright (C) 2011-2015 Red Hat, Inc.
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*
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* Authors:
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* Anthony Liguori <aliguori@us.ibm.com>
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* Markus Armbruster <armbru@redhat.com>,
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*
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* This work is licensed under the terms of the GNU LGPL, version 2. See
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* the COPYING.LIB file in the top-level directory.
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*/
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#include "qemu-common.h"
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#include "qapi/error.h"
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#include "qemu/error-report.h"
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struct Error
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{
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char *msg;
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ErrorClass err_class;
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const char *src, *func;
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int line;
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GString *hint;
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};
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Error *error_abort;
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Error *error_fatal;
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static void error_handle_fatal(Error **errp, Error *err)
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{
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if (errp == &error_abort) {
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fprintf(stderr, "Unexpected error in %s() at %s:%d:\n",
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err->func, err->src, err->line);
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error_report_err(err);
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abort();
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}
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if (errp == &error_fatal) {
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error_report_err(err);
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exit(1);
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}
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}
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static void error_setv(Error **errp,
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const char *src, int line, const char *func,
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ErrorClass err_class, const char *fmt, va_list ap)
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{
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Error *err;
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int saved_errno = errno;
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if (errp == NULL) {
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return;
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}
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assert(*errp == NULL);
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err = g_malloc0(sizeof(*err));
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err->msg = g_strdup_vprintf(fmt, ap);
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err->err_class = err_class;
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err->src = src;
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err->line = line;
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err->func = func;
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error_handle_fatal(errp, err);
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*errp = err;
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errno = saved_errno;
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}
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void error_set_internal(Error **errp,
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const char *src, int line, const char *func,
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ErrorClass err_class, const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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error_setv(errp, src, line, func, err_class, fmt, ap);
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va_end(ap);
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}
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void error_setg_internal(Error **errp,
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const char *src, int line, const char *func,
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const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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error_setv(errp, src, line, func, ERROR_CLASS_GENERIC_ERROR, fmt, ap);
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va_end(ap);
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}
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void error_setg_errno_internal(Error **errp,
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const char *src, int line, const char *func,
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int os_errno, const char *fmt, ...)
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{
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va_list ap;
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char *msg;
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int saved_errno = errno;
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if (errp == NULL) {
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return;
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}
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va_start(ap, fmt);
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error_setv(errp, src, line, func, ERROR_CLASS_GENERIC_ERROR, fmt, ap);
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va_end(ap);
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if (os_errno != 0) {
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msg = (*errp)->msg;
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(*errp)->msg = g_strdup_printf("%s: %s", msg, strerror(os_errno));
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g_free(msg);
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}
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errno = saved_errno;
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}
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void error_setg_file_open_internal(Error **errp,
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const char *src, int line, const char *func,
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int os_errno, const char *filename)
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{
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error_setg_errno_internal(errp, src, line, func, os_errno,
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"Could not open '%s'", filename);
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}
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void error_append_hint(Error **errp, const char *fmt, ...)
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{
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va_list ap;
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int saved_errno = errno;
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Error *err;
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if (!errp) {
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return;
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}
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err = *errp;
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assert(err && errp != &error_abort);
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if (!err->hint) {
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err->hint = g_string_new(NULL);
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}
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va_start(ap, fmt);
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g_string_append_vprintf(err->hint, fmt, ap);
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va_end(ap);
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errno = saved_errno;
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}
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#ifdef _WIN32
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void error_setg_win32_internal(Error **errp,
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const char *src, int line, const char *func,
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int win32_err, const char *fmt, ...)
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{
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va_list ap;
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char *msg1, *msg2;
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if (errp == NULL) {
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return;
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}
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va_start(ap, fmt);
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error_setv(errp, src, line, func, ERROR_CLASS_GENERIC_ERROR, fmt, ap);
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va_end(ap);
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if (win32_err != 0) {
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msg1 = (*errp)->msg;
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msg2 = g_win32_error_message(win32_err);
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(*errp)->msg = g_strdup_printf("%s: %s (error: %x)", msg1, msg2,
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(unsigned)win32_err);
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g_free(msg2);
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g_free(msg1);
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}
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}
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#endif
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Error *error_copy(const Error *err)
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{
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Error *err_new;
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err_new = g_malloc0(sizeof(*err));
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err_new->msg = g_strdup(err->msg);
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err_new->err_class = err->err_class;
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err_new->src = err->src;
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err_new->line = err->line;
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err_new->func = err->func;
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if (err->hint) {
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err_new->hint = g_string_new(err->hint->str);
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}
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return err_new;
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}
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ErrorClass error_get_class(const Error *err)
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{
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return err->err_class;
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}
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const char *error_get_pretty(Error *err)
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{
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return err->msg;
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}
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void error_report_err(Error *err)
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{
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error_report("%s", error_get_pretty(err));
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if (err->hint) {
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error_printf_unless_qmp("%s", err->hint->str);
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}
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error_free(err);
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}
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void error_free(Error *err)
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{
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if (err) {
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g_free(err->msg);
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if (err->hint) {
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g_string_free(err->hint, true);
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}
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g_free(err);
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}
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}
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void error_free_or_abort(Error **errp)
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{
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assert(errp && *errp);
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error_free(*errp);
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*errp = NULL;
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}
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void error_propagate(Error **dst_errp, Error *local_err)
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{
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if (!local_err) {
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return;
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}
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error_handle_fatal(dst_errp, local_err);
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if (dst_errp && !*dst_errp) {
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*dst_errp = local_err;
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} else {
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error_free(local_err);
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}
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}
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