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8d13558ae6
libvirt/src/virterror.c
John Levon fa7f51b813 introduce virSaveLastError(), virFreeError()
2009-02-09 14:16:23 +00:00

1114 lines
32 KiB
C
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/*
* virterror.c: implements error handling and reporting code for libvirt
*
* Copy: Copyright (C) 2006, 2008, 2009 Red Hat, Inc.
*
* See COPYING.LIB for the License of this software
*
* Author: Daniel Veillard <veillard@redhat.com>
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include "virterror_internal.h"
#include "datatypes.h"
#include "logging.h"
#include "memory.h"
#include "threads.h"
#include "util.h"
virThreadLocal virLastErr;
virErrorFunc virErrorHandler = NULL; /* global error handler */
void *virUserData = NULL; /* associated data */
/*
* Macro used to format the message as a string in virRaiseError
* and borrowed from libxml2.
*/
#define VIR_GET_VAR_STR(msg, str) { \
int size, prev_size = -1; \
int chars; \
char *larger; \
va_list ap; \
\
str = (char *) malloc(150); \
if (str != NULL) { \
\
size = 150; \
\
while (1) { \
va_start(ap, msg); \
chars = vsnprintf(str, size, msg, ap); \
va_end(ap); \
if ((chars > -1) && (chars < size)) { \
if (prev_size == chars) { \
break; \
} else { \
prev_size = chars; \
} \
} \
if (chars > -1) \
size += chars + 1; \
else \
size += 100; \
if ((larger = (char *) realloc(str, size)) == NULL) { \
break; \
} \
str = larger; \
}} \
}
static virLogPriority virErrorLevelPriority(virErrorLevel level) {
switch (level) {
case VIR_ERR_NONE:
return(VIR_LOG_INFO);
case VIR_ERR_WARNING:
return(VIR_LOG_WARN);
case VIR_ERR_ERROR:
return(VIR_LOG_ERROR);
}
return(VIR_LOG_ERROR);
}
static const char *virErrorDomainName(virErrorDomain domain) {
const char *dom = "unknown";
switch (domain) {
case VIR_FROM_NONE:
dom = "";
break;
case VIR_FROM_XEN:
dom = "Xen ";
break;
case VIR_FROM_XML:
dom = "XML ";
break;
case VIR_FROM_XEND:
dom = "Xen Daemon ";
break;
case VIR_FROM_XENSTORE:
dom = "Xen Store ";
break;
case VIR_FROM_XEN_INOTIFY:
dom = "Xen Inotify ";
break;
case VIR_FROM_DOM:
dom = "Domain ";
break;
case VIR_FROM_RPC:
dom = "XML-RPC ";
break;
case VIR_FROM_QEMU:
dom = "QEMU ";
break;
case VIR_FROM_NET:
dom = "Network ";
break;
case VIR_FROM_TEST:
dom = "Test ";
break;
case VIR_FROM_REMOTE:
dom = "Remote ";
break;
case VIR_FROM_SEXPR:
dom = "S-Expr ";
break;
case VIR_FROM_PROXY:
dom = "PROXY ";
break;
case VIR_FROM_CONF:
dom = "Config ";
break;
case VIR_FROM_OPENVZ:
dom = "OpenVZ ";
break;
case VIR_FROM_XENXM:
dom = "Xen XM ";
break;
case VIR_FROM_STATS_LINUX:
dom = "Linux Stats ";
break;
case VIR_FROM_LXC:
dom = "Linux Container ";
break;
case VIR_FROM_STORAGE:
dom = "Storage ";
break;
case VIR_FROM_NETWORK:
dom = "Network Config ";
break;
case VIR_FROM_DOMAIN:
dom = "Domain Config ";
break;
case VIR_FROM_NODEDEV:
dom = "Node Device ";
break;
case VIR_FROM_UML:
dom = "UML ";
break;
}
return(dom);
}
/*
* Internal helper that is called when a thread exits, to
* release the error object stored in the thread local
*/
static void
virLastErrFreeData(void *data)
{
virErrorPtr err = data;
if (!err)
return;
virResetError(err);
VIR_FREE(err);
}
int
virErrorInitialize(void)
{
return virThreadLocalInit(&virLastErr, virLastErrFreeData);
}
/*
* Internal helper to ensure a generic error code is stored
* in case where API returns failure, but forgot to set an
* error
*/
static void
virErrorGenericFailure(virErrorPtr err)
{
err->code = VIR_ERR_INTERNAL_ERROR;
err->domain = VIR_FROM_NONE;
err->level = VIR_ERR_ERROR;
err->message = strdup(_("Unknown failure"));
}
/*
* Internal helper to perform a deep copy of the an error
*/
static int
virCopyError(virErrorPtr from,
virErrorPtr to)
{
int ret = 0;
if (!to)
return 0;
virResetError(to);
if (!from)
return 0;
to->code = from->code;
to->domain = from->domain;
to->level = from->level;
if (from->message && !(to->message = strdup(from->message)))
ret = -1;
if (from->str1 && !(to->str1 = strdup(from->str1)))
ret = -1;
if (from->str2 && !(to->str2 = strdup(from->str2)))
ret = -1;
if (from->str3 && !(to->str3 = strdup(from->str3)))
ret = -1;
to->int1 = from->int1;
to->int2 = from->int2;
/*
* Delibrately not setting 'conn', 'dom', 'net' references
*/
return ret;
}
static virErrorPtr
virLastErrorObject(void)
{
virErrorPtr err;
err = virThreadLocalGet(&virLastErr);
if (!err) {
if (VIR_ALLOC(err) < 0)
return NULL;
virThreadLocalSet(&virLastErr, err);
}
return err;
}
/**
* virGetLastError:
*
* Provide a pointer to the last error caught at the library level
*
* The error object is kept in thread local storage, so separate
* threads can safely access this concurrently.
*
* Returns a pointer to the last error or NULL if none occurred.
*/
virErrorPtr
virGetLastError(void)
{
virErrorPtr err = virLastErrorObject();
if (!err || err->code == VIR_ERR_OK)
return NULL;
return err;
}
/**
* virCopyLastError:
* @to: target to receive the copy
*
* Copy the content of the last error caught at the library level
*
* The error object is kept in thread local storage, so separate
* threads can safely access this concurrently.
*
* One will need to free the result with virResetError()
*
* Returns 0 if no error was found and the error code otherwise and -1 in case
* of parameter error.
*/
int
virCopyLastError(virErrorPtr to)
{
virErrorPtr err = virLastErrorObject();
/* We can't guarentee caller has initialized it to zero */
memset(to, 0, sizeof(*to));
if (err)
virCopyError(err, to);
else
virResetError(to);
return to->code;
}
/**
* virSaveLastError:
*
* Save the last error into a new error object.
*
* Returns a pointer to the copied error or NULL if allocation failed.
* It is the caller's responsibility to free the error with
* virFreeError().
*/
virErrorPtr
virSaveLastError(void)
{
virErrorPtr to;
if (VIR_ALLOC(to) < 0)
return NULL;
virCopyLastError(to);
return to;
}
/**
* virResetError:
* @err: pointer to the virError to clean up
*
* Reset the error being pointed to
*/
void
virResetError(virErrorPtr err)
{
if (err == NULL)
return;
free(err->message);
free(err->str1);
free(err->str2);
free(err->str3);
memset(err, 0, sizeof(virError));
}
/**
* virFreeError:
* @err: error to free
*
* Resets and frees the given error.
*/
void
virFreeError(virErrorPtr err)
{
virResetError(err);
VIR_FREE(err);
}
/**
* virResetLastError:
*
* Reset the last error caught at the library level.
*
* The error object is kept in thread local storage, so separate
* threads can safely access this concurrently, only resetting
* their own error object.
*/
void
virResetLastError(void)
{
virErrorPtr err = virLastErrorObject();
if (err)
virResetError(err);
}
/**
* virConnGetLastError:
* @conn: pointer to the hypervisor connection
*
* Provide a pointer to the last error caught on that connection
*
* This method is not protected against access from multiple
* threads. In a multi-threaded application, always use the
* global virGetLastError() API which is backed by thread
* local storage.
*
* If the connection object was discovered to be invalid by
* an API call, then the error will be reported against the
* global error object.
*
* Since 0.6.0, all errors reported in the per-connection object
* are also duplicated in the global error object. As such an
* application can always use virGetLastError(). This method
* remains for backwards compatability.
*
* Returns a pointer to the last error or NULL if none occurred.
*/
virErrorPtr
virConnGetLastError(virConnectPtr conn)
{
if (conn == NULL)
return NULL;
return &conn->err;
}
/**
* virConnCopyLastError:
* @conn: pointer to the hypervisor connection
* @to: target to receive the copy
*
* Copy the content of the last error caught on that connection
*
* This method is not protected against access from multiple
* threads. In a multi-threaded application, always use the
* global virGetLastError() API which is backed by thread
* local storage.
*
* If the connection object was discovered to be invalid by
* an API call, then the error will be reported against the
* global error object.
*
* Since 0.6.0, all errors reported in the per-connection object
* are also duplicated in the global error object. As such an
* application can always use virGetLastError(). This method
* remains for backwards compatability.
*
* One will need to free the result with virResetError()
*
* Returns 0 if no error was found and the error code otherwise and -1 in case
* of parameter error.
*/
int
virConnCopyLastError(virConnectPtr conn, virErrorPtr to)
{
/* We can't guarentee caller has initialized it to zero */
memset(to, 0, sizeof(*to));
if (conn == NULL)
return -1;
virMutexLock(&conn->lock);
if (conn->err.code == VIR_ERR_OK)
virResetError(to);
else
virCopyError(&conn->err, to);
virMutexUnlock(&conn->lock);
return to->code;
}
/**
* virConnResetLastError:
* @conn: pointer to the hypervisor connection
*
* The error object is kept in thread local storage, so separate
* threads can safely access this concurrently.
*
* Reset the last error caught on that connection
*/
void
virConnResetLastError(virConnectPtr conn)
{
if (conn == NULL)
return;
virMutexLock(&conn->lock);
virResetError(&conn->err);
virMutexUnlock(&conn->lock);
}
/**
* virSetErrorFunc:
* @userData: pointer to the user data provided in the handler callback
* @handler: the function to get called in case of error or NULL
*
* Set a library global error handling function, if @handler is NULL,
* it will reset to default printing on stderr. The error raised there
* are those for which no handler at the connection level could caught.
*/
void
virSetErrorFunc(void *userData, virErrorFunc handler)
{
virErrorHandler = handler;
virUserData = userData;
}
/**
* virConnSetErrorFunc:
* @conn: pointer to the hypervisor connection
* @userData: pointer to the user data provided in the handler callback
* @handler: the function to get called in case of error or NULL
*
* Set a connection error handling function, if @handler is NULL
* it will reset to default which is to pass error back to the global
* library handler.
*/
void
virConnSetErrorFunc(virConnectPtr conn, void *userData,
virErrorFunc handler)
{
if (conn == NULL)
return;
virMutexLock(&conn->lock);
conn->handler = handler;
conn->userData = userData;
virMutexUnlock(&conn->lock);
}
/**
* virDefaultErrorFunc:
* @err: pointer to the error.
*
* Default routine reporting an error to stderr.
*/
void
virDefaultErrorFunc(virErrorPtr err)
{
const char *lvl = "", *dom = "", *domain = "", *network = "";
int len;
if ((err == NULL) || (err->code == VIR_ERR_OK))
return;
switch (err->level) {
case VIR_ERR_NONE:
lvl = "";
break;
case VIR_ERR_WARNING:
lvl = _("warning");
break;
case VIR_ERR_ERROR:
lvl = _("error");
break;
}
dom = virErrorDomainName(err->domain);
if ((err->dom != NULL) && (err->code != VIR_ERR_INVALID_DOMAIN)) {
domain = err->dom->name;
} else if ((err->net != NULL) && (err->code != VIR_ERR_INVALID_NETWORK)) {
network = err->net->name;
}
len = strlen(err->message);
if ((err->domain == VIR_FROM_XML) && (err->code == VIR_ERR_XML_DETAIL) &&
(err->int1 != 0))
fprintf(stderr, "libvir: %s%s %s%s: line %d: %s",
dom, lvl, domain, network, err->int1, err->message);
else if ((len == 0) || (err->message[len - 1] != '\n'))
fprintf(stderr, "libvir: %s%s %s%s: %s\n",
dom, lvl, domain, network, err->message);
else
fprintf(stderr, "libvir: %s%s %s%s: %s",
dom, lvl, domain, network, err->message);
}
/*
* Internal helper to ensure the global error object
* is initialized with a generic message if not already
* set.
*/
void
virSetGlobalError(void)
{
virErrorPtr err = virLastErrorObject();
if (err && err->code == VIR_ERR_OK)
virErrorGenericFailure(err);
}
/*
* Internal helper to ensure the connection error object
* is initialized from the global object.
*/
void
virSetConnError(virConnectPtr conn)
{
virErrorPtr err = virLastErrorObject();
if (err && err->code == VIR_ERR_OK)
virErrorGenericFailure(err);
if (conn) {
virMutexLock(&conn->lock);
if (err)
virCopyError(err, &conn->err);
else
virErrorGenericFailure(&conn->err);
virMutexUnlock(&conn->lock);
}
}
/**
* virRaiseError:
* @conn: the connection to the hypervisor if available
* @dom: the domain if available
* @net: the network if available
* @domain: the virErrorDomain indicating where it's coming from
* @code: the virErrorNumber code for the error
* @level: the virErrorLevel for the error
* @str1: extra string info
* @str2: extra string info
* @str3: extra string info
* @int1: extra int info
* @int2: extra int info
* @msg: the message to display/transmit
* @...: extra parameters for the message display
*
* Internal routine called when an error is detected. It will raise it
* immediately if a callback is found and store it for later handling.
*/
void
virRaiseError(virConnectPtr conn,
virDomainPtr dom ATTRIBUTE_UNUSED,
virNetworkPtr net ATTRIBUTE_UNUSED,
int domain, int code, virErrorLevel level,
const char *str1, const char *str2, const char *str3,
int int1, int int2, const char *msg, ...)
{
virErrorPtr to;
void *userData = virUserData;
virErrorFunc handler = virErrorHandler;
char *str;
/*
* All errors are recorded in thread local storage
* For compatability, public API calls will copy them
* to the per-connection error object when neccessary
*/
to = virLastErrorObject();
if (!to)
return; /* Hit OOM allocating thread error object, sod all we can do now */
virResetError(to);
if (code == VIR_ERR_OK)
return;
/*
* try to find the best place to save and report the error
*/
if (conn != NULL) {
virMutexLock(&conn->lock);
if (conn->handler != NULL) {
handler = conn->handler;
userData = conn->userData;
}
virMutexUnlock(&conn->lock);
}
/*
* formats the message
*/
if (msg == NULL) {
str = strdup(_("No error message provided"));
} else {
VIR_GET_VAR_STR(msg, str);
}
/*
* Hook up the error or warning to the logging facility
* TODO: pass function name and lineno
*/
virLogMessage(virErrorDomainName(domain), virErrorLevelPriority(level),
NULL, 0, 1, "%s", str);
/*
* Save the information about the error
*/
virResetError(to);
/*
* Delibrately not setting conn, dom & net fields since
* they're utterly unsafe
*/
to->domain = domain;
to->code = code;
to->message = str;
to->level = level;
if (str1 != NULL)
to->str1 = strdup(str1);
if (str2 != NULL)
to->str2 = strdup(str2);
if (str3 != NULL)
to->str3 = strdup(str3);
to->int1 = int1;
to->int2 = int2;
/*
* now, report it
*/
if (handler != NULL) {
handler(userData, to);
} else {
virDefaultErrorFunc(to);
}
}
/**
* virErrorMsg:
* @error: the virErrorNumber
* @info: usually the first parameter string
*
* Internal routine to get the message associated to an error raised
* from the library
*
* Returns the constant string associated to @error
*/
const char *
virErrorMsg(virErrorNumber error, const char *info)
{
const char *errmsg = NULL;
switch (error) {
case VIR_ERR_OK:
return (NULL);
case VIR_ERR_INTERNAL_ERROR:
if (info != NULL)
errmsg = _("internal error %s");
else
errmsg = _("internal error");
break;
case VIR_ERR_NO_MEMORY:
errmsg = _("out of memory");
break;
case VIR_ERR_NO_SUPPORT:
if (info == NULL)
errmsg = _("this function is not supported by the hypervisor");
else
errmsg = _("this function is not supported by the hypervisor: %s");
break;
case VIR_ERR_NO_CONNECT:
if (info == NULL)
errmsg = _("could not connect to hypervisor");
else
errmsg = _("could not connect to %s");
break;
case VIR_ERR_INVALID_CONN:
if (info == NULL)
errmsg = _("invalid connection pointer in");
else
errmsg = _("invalid connection pointer in %s");
break;
case VIR_ERR_INVALID_DOMAIN:
if (info == NULL)
errmsg = _("invalid domain pointer in");
else
errmsg = _("invalid domain pointer in %s");
break;
case VIR_ERR_INVALID_ARG:
if (info == NULL)
errmsg = _("invalid argument in");
else
errmsg = _("invalid argument in %s");
break;
case VIR_ERR_OPERATION_FAILED:
if (info != NULL)
errmsg = _("operation failed: %s");
else
errmsg = _("operation failed");
break;
case VIR_ERR_GET_FAILED:
if (info != NULL)
errmsg = _("GET operation failed: %s");
else
errmsg = _("GET operation failed");
break;
case VIR_ERR_POST_FAILED:
if (info != NULL)
errmsg = _("POST operation failed: %s");
else
errmsg = _("POST operation failed");
break;
case VIR_ERR_HTTP_ERROR:
errmsg = _("got unknown HTTP error code %d");
break;
case VIR_ERR_UNKNOWN_HOST:
if (info != NULL)
errmsg = _("unknown host %s");
else
errmsg = _("unknown host");
break;
case VIR_ERR_SEXPR_SERIAL:
if (info != NULL)
errmsg = _("failed to serialize S-Expr: %s");
else
errmsg = _("failed to serialize S-Expr");
break;
case VIR_ERR_NO_XEN:
if (info == NULL)
errmsg = _("could not use Xen hypervisor entry");
else
errmsg = _("could not use Xen hypervisor entry %s");
break;
case VIR_ERR_NO_XENSTORE:
if (info == NULL)
errmsg = _("could not connect to Xen Store");
else
errmsg = _("could not connect to Xen Store %s");
break;
case VIR_ERR_XEN_CALL:
errmsg = _("failed Xen syscall %s");
break;
case VIR_ERR_OS_TYPE:
if (info == NULL)
errmsg = _("unknown OS type");
else
errmsg = _("unknown OS type %s");
break;
case VIR_ERR_NO_KERNEL:
errmsg = _("missing kernel information");
break;
case VIR_ERR_NO_ROOT:
if (info == NULL)
errmsg = _("missing root device information");
else
errmsg = _("missing root device information in %s");
break;
case VIR_ERR_NO_SOURCE:
if (info == NULL)
errmsg = _("missing source information for device");
else
errmsg = _("missing source information for device %s");
break;
case VIR_ERR_NO_TARGET:
if (info == NULL)
errmsg = _("missing target information for device");
else
errmsg = _("missing target information for device %s");
break;
case VIR_ERR_NO_NAME:
if (info == NULL)
errmsg = _("missing domain name information");
else
errmsg = _("missing domain name information in %s");
break;
case VIR_ERR_NO_OS:
if (info == NULL)
errmsg = _("missing operating system information");
else
errmsg = _("missing operating system information for %s");
break;
case VIR_ERR_NO_DEVICE:
if (info == NULL)
errmsg = _("missing devices information");
else
errmsg = _("missing devices information for %s");
break;
case VIR_ERR_DRIVER_FULL:
if (info == NULL)
errmsg = _("too many drivers registered");
else
errmsg = _("too many drivers registered in %s");
break;
case VIR_ERR_CALL_FAILED: /* DEPRECATED, use VIR_ERR_NO_SUPPORT */
if (info == NULL)
errmsg = _("library call failed, possibly not supported");
else
errmsg = _("library call %s failed, possibly not supported");
break;
case VIR_ERR_XML_ERROR:
if (info == NULL)
errmsg = _("XML description not well formed or invalid");
else
errmsg = _("XML description for %s is not well formed or invalid");
break;
case VIR_ERR_DOM_EXIST:
if (info == NULL)
errmsg = _("this domain exists already");
else
errmsg = _("domain %s exists already");
break;
case VIR_ERR_OPERATION_DENIED:
if (info == NULL)
errmsg = _("operation forbidden for read only access");
else
errmsg = _("operation %s forbidden for read only access");
break;
case VIR_ERR_OPEN_FAILED:
if (info == NULL)
errmsg = _("failed to open configuration file for reading");
else
errmsg = _("failed to open %s for reading");
break;
case VIR_ERR_READ_FAILED:
if (info == NULL)
errmsg = _("failed to read configuration file");
else
errmsg = _("failed to read configuration file %s");
break;
case VIR_ERR_PARSE_FAILED:
if (info == NULL)
errmsg = _("failed to parse configuration file");
else
errmsg = _("failed to parse configuration file %s");
break;
case VIR_ERR_CONF_SYNTAX:
if (info == NULL)
errmsg = _("configuration file syntax error");
else
errmsg = _("configuration file syntax error: %s");
break;
case VIR_ERR_WRITE_FAILED:
if (info == NULL)
errmsg = _("failed to write configuration file");
else
errmsg = _("failed to write configuration file: %s");
break;
case VIR_ERR_XML_DETAIL:
if (info == NULL)
errmsg = _("parser error");
else
errmsg = "%s";
break;
case VIR_ERR_INVALID_NETWORK:
if (info == NULL)
errmsg = _("invalid network pointer in");
else
errmsg = _("invalid network pointer in %s");
break;
case VIR_ERR_NETWORK_EXIST:
if (info == NULL)
errmsg = _("this network exists already");
else
errmsg = _("network %s exists already");
break;
case VIR_ERR_SYSTEM_ERROR:
if (info == NULL)
errmsg = _("system call error");
else
errmsg = "%s";
break;
case VIR_ERR_RPC:
if (info == NULL)
errmsg = _("RPC error");
else
errmsg = "%s";
break;
case VIR_ERR_GNUTLS_ERROR:
if (info == NULL)
errmsg = _("GNUTLS call error");
else
errmsg = "%s";
break;
case VIR_WAR_NO_NETWORK:
if (info == NULL)
errmsg = _("Failed to find the network");
else
errmsg = _("Failed to find the network: %s");
break;
case VIR_ERR_NO_DOMAIN:
if (info == NULL)
errmsg = _("Domain not found");
else
errmsg = _("Domain not found: %s");
break;
case VIR_ERR_NO_NETWORK:
if (info == NULL)
errmsg = _("Network not found");
else
errmsg = _("Network not found: %s");
break;
case VIR_ERR_INVALID_MAC:
if (info == NULL)
errmsg = _("invalid MAC address");
else
errmsg = _("invalid MAC address: %s");
break;
case VIR_ERR_AUTH_FAILED:
if (info == NULL)
errmsg = _("authentication failed");
else
errmsg = _("authentication failed: %s");
break;
case VIR_ERR_NO_STORAGE_POOL:
if (info == NULL)
errmsg = _("Storage pool not found");
else
errmsg = _("Storage pool not found: %s");
break;
case VIR_ERR_NO_STORAGE_VOL:
if (info == NULL)
errmsg = _("Storage volume not found");
else
errmsg = _("Storage volume not found: %s");
break;
case VIR_ERR_INVALID_STORAGE_POOL:
if (info == NULL)
errmsg = _("invalid storage pool pointer in");
else
errmsg = _("invalid storage pool pointer in %s");
break;
case VIR_ERR_INVALID_STORAGE_VOL:
if (info == NULL)
errmsg = _("invalid storage volume pointer in");
else
errmsg = _("invalid storage volume pointer in %s");
break;
case VIR_WAR_NO_STORAGE:
if (info == NULL)
errmsg = _("Failed to find a storage driver");
else
errmsg = _("Failed to find a storage driver: %s");
break;
case VIR_WAR_NO_NODE:
if (info == NULL)
errmsg = _("Failed to find a node driver");
else
errmsg = _("Failed to find a node driver: %s");
break;
case VIR_ERR_INVALID_NODE_DEVICE:
if (info == NULL)
errmsg = _("invalid node device pointer");
else
errmsg = _("invalid node device pointer in %s");
break;
case VIR_ERR_NO_NODE_DEVICE:
if (info == NULL)
errmsg = _("Node device not found");
else
errmsg = _("Node device not found: %s");
break;
}
return (errmsg);
}
/**
* virReportErrorHelper:
*
* @conn: the connection to the hypervisor if available
* @domcode: the virErrorDomain indicating where it's coming from
* @errcode: the virErrorNumber code for the error
* @filename: Source file error is dispatched from
* @funcname: Function error is dispatched from
* @linenr: Line number error is dispatched from
* @fmt: the format string
* @...: extra parameters for the message display
*
* Helper function to do most of the grunt work for individual driver
* ReportError
*/
void virReportErrorHelper(virConnectPtr conn, int domcode, int errcode,
const char *filename ATTRIBUTE_UNUSED,
const char *funcname ATTRIBUTE_UNUSED,
size_t linenr ATTRIBUTE_UNUSED,
const char *fmt, ...)
{
va_list args;
char errorMessage[1024];
const char *virerr;
if (fmt) {
va_start(args, fmt);
vsnprintf(errorMessage, sizeof(errorMessage)-1, fmt, args);
va_end(args);
} else {
errorMessage[0] = '\0';
}
virerr = virErrorMsg(errcode, (errorMessage[0] ? errorMessage : NULL));
virRaiseError(conn, NULL, NULL, domcode, errcode, VIR_ERR_ERROR,
virerr, errorMessage, NULL, -1, -1, virerr, errorMessage);
}
const char *virStrerror(int theerrno, char *errBuf, size_t errBufLen)
{
#ifdef HAVE_STRERROR_R
# ifdef __USE_GNU
/* Annoying linux specific API contract */
return strerror_r(theerrno, errBuf, errBufLen);
# else
strerror_r(theerrno, errBuf, errBufLen);
return errBuf;
# endif
#else
/* Mingw lacks strerror_r() and its strerror() is definitely not
* threadsafe, so safest option is to just print the raw errno
* value - we can at least reliably & safely look it up in the
* header files for debug purposes
*/
int n = snprintf(errBuf, errBufLen, "errno=%d", theerrno);
return (0 < n && n < errBufLen
? errBuf : _("internal error: buffer too small"));
#endif
}
void virReportSystemErrorFull(virConnectPtr conn,
int domcode,
int theerrno,
const char *filename ATTRIBUTE_UNUSED,
const char *funcname ATTRIBUTE_UNUSED,
size_t linenr ATTRIBUTE_UNUSED,
const char *fmt, ...)
{
char strerror_buf[1024];
char msgDetailBuf[1024];
const char *errnoDetail = virStrerror(theerrno, strerror_buf,
sizeof(strerror_buf));
const char *msg = virErrorMsg(VIR_ERR_SYSTEM_ERROR, fmt);
const char *msgDetail = NULL;
if (fmt) {
va_list args;
int n;
va_start(args, fmt);
n = vsnprintf(msgDetailBuf, sizeof(msgDetailBuf), fmt, args);
va_end(args);
size_t len = strlen (msgDetailBuf);
if (0 <= n && n + 2 + len < sizeof (msgDetailBuf)) {
char *p = msgDetailBuf + n;
stpcpy (stpcpy (p, ": "), errnoDetail);
msgDetail = msgDetailBuf;
}
}
if (!msgDetail)
msgDetail = errnoDetail;
virRaiseError(conn, NULL, NULL, domcode, VIR_ERR_SYSTEM_ERROR, VIR_ERR_ERROR,
msg, msgDetail, NULL, -1, -1, msg, msgDetail);
}
void virReportOOMErrorFull(virConnectPtr conn,
int domcode,
const char *filename ATTRIBUTE_UNUSED,
const char *funcname ATTRIBUTE_UNUSED,
size_t linenr ATTRIBUTE_UNUSED)
{
const char *virerr;
virerr = virErrorMsg(VIR_ERR_NO_MEMORY, NULL);
virRaiseError(conn, NULL, NULL, domcode, VIR_ERR_NO_MEMORY, VIR_ERR_ERROR,
virerr, NULL, NULL, -1, -1, virerr, NULL);
}
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