/* * QEMU Error Objects * * Copyright IBM, Corp. 2011 * Copyright (C) 2011-2015 Red Hat, Inc. * * Authors: * Anthony Liguori <aliguori@us.ibm.com> * Markus Armbruster <armbru@redhat.com>, * * This work is licensed under the terms of the GNU LGPL, version 2. See * the COPYING.LIB file in the top-level directory. */ #include "qemu-common.h" #include "qapi/error.h" #include "qemu/error-report.h" struct Error { char *msg; ErrorClass err_class; const char *src, *func; int line; GString *hint; }; Error *error_abort; Error *error_fatal; static void error_handle_fatal(Error **errp, Error *err) { if (errp == &error_abort) { fprintf(stderr, "Unexpected error in %s() at %s:%d:\n", err->func, err->src, err->line); error_report_err(err); abort(); } if (errp == &error_fatal) { error_report_err(err); exit(1); } } static void error_setv(Error **errp, const char *src, int line, const char *func, ErrorClass err_class, const char *fmt, va_list ap) { Error *err; int saved_errno = errno; if (errp == NULL) { return; } assert(*errp == NULL); err = g_malloc0(sizeof(*err)); err->msg = g_strdup_vprintf(fmt, ap); err->err_class = err_class; err->src = src; err->line = line; err->func = func; error_handle_fatal(errp, err); *errp = err; errno = saved_errno; } void error_set_internal(Error **errp, const char *src, int line, const char *func, ErrorClass err_class, const char *fmt, ...) { va_list ap; va_start(ap, fmt); error_setv(errp, src, line, func, err_class, fmt, ap); va_end(ap); } void error_setg_internal(Error **errp, const char *src, int line, const char *func, const char *fmt, ...) { va_list ap; va_start(ap, fmt); error_setv(errp, src, line, func, ERROR_CLASS_GENERIC_ERROR, fmt, ap); va_end(ap); } void error_setg_errno_internal(Error **errp, const char *src, int line, const char *func, int os_errno, const char *fmt, ...) { va_list ap; char *msg; int saved_errno = errno; if (errp == NULL) { return; } va_start(ap, fmt); error_setv(errp, src, line, func, ERROR_CLASS_GENERIC_ERROR, fmt, ap); va_end(ap); if (os_errno != 0) { msg = (*errp)->msg; (*errp)->msg = g_strdup_printf("%s: %s", msg, strerror(os_errno)); g_free(msg); } errno = saved_errno; } void error_setg_file_open_internal(Error **errp, const char *src, int line, const char *func, int os_errno, const char *filename) { error_setg_errno_internal(errp, src, line, func, os_errno, "Could not open '%s'", filename); } void error_append_hint(Error **errp, const char *fmt, ...) { va_list ap; int saved_errno = errno; Error *err; if (!errp) { return; } err = *errp; assert(err && errp != &error_abort); if (!err->hint) { err->hint = g_string_new(NULL); } va_start(ap, fmt); g_string_append_vprintf(err->hint, fmt, ap); va_end(ap); errno = saved_errno; } #ifdef _WIN32 void error_setg_win32_internal(Error **errp, const char *src, int line, const char *func, int win32_err, const char *fmt, ...) { va_list ap; char *msg1, *msg2; if (errp == NULL) { return; } va_start(ap, fmt); error_setv(errp, src, line, func, ERROR_CLASS_GENERIC_ERROR, fmt, ap); va_end(ap); if (win32_err != 0) { msg1 = (*errp)->msg; msg2 = g_win32_error_message(win32_err); (*errp)->msg = g_strdup_printf("%s: %s (error: %x)", msg1, msg2, (unsigned)win32_err); g_free(msg2); g_free(msg1); } } #endif Error *error_copy(const Error *err) { Error *err_new; err_new = g_malloc0(sizeof(*err)); err_new->msg = g_strdup(err->msg); err_new->err_class = err->err_class; err_new->src = err->src; err_new->line = err->line; err_new->func = err->func; if (err->hint) { err_new->hint = g_string_new(err->hint->str); } return err_new; } ErrorClass error_get_class(const Error *err) { return err->err_class; } const char *error_get_pretty(Error *err) { return err->msg; } void error_report_err(Error *err) { error_report("%s", error_get_pretty(err)); if (err->hint) { error_printf_unless_qmp("%s\n", err->hint->str); } error_free(err); } void error_free(Error *err) { if (err) { g_free(err->msg); if (err->hint) { g_string_free(err->hint, true); } g_free(err); } } void error_propagate(Error **dst_errp, Error *local_err) { if (!local_err) { return; } error_handle_fatal(dst_errp, local_err); if (dst_errp && !*dst_errp) { *dst_errp = local_err; } else { error_free(local_err); } }