libxenlight: Clean up logging arrangements
* Introduce new variants of the logging functions which include
errno values (converted using strerror) in the messages passed to the
application's logging callback.
* While we're at it, introduce xl_logv.
* Use the new errno-including logging functions everywhere where
appropriate. In general, xc_... functions return errno values or 0;
xs_... functions return 0 or -1 (or some such) setting errno.
* When libxl_xs_get_dompath fails, do not treat it as an allocation
error. It isn't: it usually means xenstored failed.
* Remove many spurious \n's from log messages. (The applications log
callback is expected to add a \n if it wants to do that, so libxl's
logging functions should be passes strings without \n.)
Signed-off-by: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
diff --git a/tools/libxl/libxl.c b/tools/libxl/libxl.c
index 69690e4..5e2f23b 100644
--- a/tools/libxl/libxl.c
+++ b/tools/libxl/libxl.c
@@ -106,14 +106,17 @@ int libxl_domain_make(struct libxl_ctx *ctx,
libxl_domain_create_info *info,
ret = xc_domain_create(ctx->xch, info->ssidref, handle, flags, domid);
if (ret < 0) {
- XL_LOG(ctx, XL_LOG_ERROR, "domain creation fail: %d", ret);
+ XL_LOG_ERRNOVAL(ctx, XL_LOG_ERROR, ret, "domain creation fail");
return ERROR_FAIL;
}
dom_path = libxl_xs_get_dompath(ctx, *domid);
+ if (!dom_path)
+ return ERROR_FAIL;
+
vm_path = libxl_sprintf(ctx, "/vm/%s", uuid_string);
vss_path = libxl_sprintf(ctx, "/vss/%s", uuid_string);
- if (!dom_path || !vm_path || !vss_path) {
+ if (!vm_path || !vss_path) {
XL_LOG(ctx, XL_LOG_ERROR, "cannot allocate create paths");
return ERROR_FAIL;
}
@@ -326,6 +329,9 @@ int libxl_domain_shutdown(struct libxl_ctx *ctx, uint32_t
domid, int req)
return ERROR_INVAL;
dom_path = libxl_xs_get_dompath(ctx, domid);
+ if (!dom_path)
+ return ERROR_FAIL;
+
shutdown_path = libxl_sprintf(ctx, "%s/control/shutdown", dom_path);
xs_write(ctx->xsh, XBT_NULL, shutdown_path, req_table[req],
strlen(req_table[req]));
@@ -347,20 +353,21 @@ static int libxl_destroy_device_model(struct libxl_ctx
*ctx, uint32_t domid)
pid = libxl_xs_read(ctx, XBT_NULL, libxl_sprintf(ctx,
"/local/domain/%d/image/device-model-pid", domid));
if (!pid) {
- XL_LOG(ctx, XL_LOG_ERROR, "Couldn't find device model's pid\n");
+ XL_LOG_ERRNO(ctx, XL_LOG_ERROR, "Couldn't find device model's pid");
return -1;
}
xs_rm(ctx->xsh, XBT_NULL, libxl_sprintf(ctx,
"/local/domain/0/device-model/%d", domid));
ret = kill(atoi(pid), SIGHUP);
if (ret < 0 && errno == ESRCH) {
- XL_LOG(ctx, XL_LOG_DEBUG, "Device Model already exited\n");
+ XL_LOG(ctx, XL_LOG_DEBUG, "Device Model already exited");
ret = 0;
} else if (ret == 0) {
- XL_LOG(ctx, XL_LOG_DEBUG, "Device Model signaled\n");
+ XL_LOG(ctx, XL_LOG_DEBUG, "Device Model signaled");
ret = 0;
} else {
- XL_LOG(ctx, XL_LOG_ERROR, "kill %d returned %d errno=%d\n", atoi(pid),
ret, errno);
+ XL_LOG_ERRNO(ctx, XL_LOG_ERROR, "failed to kill Device Model [%d]",
+ atoi(pid));
}
return ret;
}
@@ -369,38 +376,40 @@ int libxl_domain_destroy(struct libxl_ctx *ctx, uint32_t
domid, int force)
{
char *dom_path, vm_path[41];
xen_uuid_t *uuid;
+ int rc;
dom_path = libxl_xs_get_dompath(ctx, domid);
- if (!dom_path) {
- XL_LOG(ctx, XL_LOG_ERROR, "dompath doesn't exist for %d\n", domid);
+ if (!dom_path)
return -1;
- }
+
if (libxl_domid_to_uuid(ctx, &uuid, domid) < 0) {
- XL_LOG(ctx, XL_LOG_ERROR, "failed ot get uuid for %d\n", domid);
+ XL_LOG(ctx, XL_LOG_ERROR, "failed ot get uuid for %d", domid);
return -1;
}
if (libxl_device_pci_shutdown(ctx, domid) < 0)
- XL_LOG(ctx, XL_LOG_ERROR, "pci shutdown failed for domid %d\n", domid);
+ XL_LOG(ctx, XL_LOG_ERROR, "pci shutdown failed for domid %d", domid);
xs_write(ctx->xsh, XBT_NULL,
libxl_sprintf(ctx, "/local/domain/0/device-model/%d/command",
domid),
"shutdown", strlen("shutdown"));
- if (xc_domain_pause(ctx->xch, domid) < 0) {
- XL_LOG(ctx, XL_LOG_ERROR, "xc_domain_pause failed for %d\n", domid);
+ rc = xc_domain_pause(ctx->xch, domid);
+ if (rc < 0) {
+ XL_LOG_ERRNOVAL(ctx, XL_LOG_ERROR, rc, "xc_domain_pause failed for
%d", domid);
return -1;
}
- if (xc_domain_destroy(ctx->xch, domid) < 0) {
- XL_LOG(ctx, XL_LOG_ERROR, "xc_domain_destroy failed for %d\n", domid);
+ rc = xc_domain_destroy(ctx->xch, domid);
+ if (rc < 0) {
+ XL_LOG_ERRNOVAL(ctx, XL_LOG_ERROR, rc, "xc_domain_destroy failed for
%d", domid);
return -1;
}
if (libxl_devices_destroy(ctx, domid, force) < 0)
- XL_LOG(ctx, XL_LOG_ERROR, "libxl_destroy_devices failed for %d\n",
domid);
+ XL_LOG(ctx, XL_LOG_ERROR, "libxl_destroy_devices failed for %d",
domid);
if (libxl_destroy_device_model(ctx, domid) < 0)
- XL_LOG(ctx, XL_LOG_ERROR, "libxl_destroy_device_model failed for
%d\n", domid);
+ XL_LOG(ctx, XL_LOG_ERROR, "libxl_destroy_device_model failed for %d",
domid);
if (!xs_rm(ctx->xsh, XBT_NULL, dom_path))
- XL_LOG(ctx, XL_LOG_ERROR, "xs_rm failed for %s\n", dom_path);
+ XL_LOG_ERRNO(ctx, XL_LOG_ERROR, "xs_rm failed for %s", dom_path);
snprintf(vm_path, sizeof(vm_path), "/vm/%s", libxl_uuid_to_string(ctx,
uuid));
if (!xs_rm(ctx->xsh, XBT_NULL, vm_path))
- XL_LOG(ctx, XL_LOG_ERROR, "xs_rm failed for %s\n", vm_path);
+ XL_LOG_ERRNO(ctx, XL_LOG_ERROR, "xs_rm failed for %s", vm_path);
return 0;
}
@@ -524,6 +533,8 @@ int libxl_create_device_model(struct libxl_ctx *ctx,
return ERROR_FAIL;
dom_path = libxl_xs_get_dompath(ctx, info->domid);
+ if (!dom_path)
+ return ERROR_FAIL;
path = libxl_sprintf(ctx, "/local/domain/0/device-model/%d", info->domid);
xs_mkdir(ctx->xsh, XBT_NULL, path);
@@ -1017,7 +1028,7 @@ static int libxl_create_pci_backend(struct libxl_ctx
*ctx, uint32_t domid, libxl
if (!back)
return ERROR_NOMEM;
- XL_LOG(ctx, XL_LOG_DEBUG, "Creating pci backend\n");
+ XL_LOG(ctx, XL_LOG_DEBUG, "Creating pci backend");
/* add pci device */
device.backend_devid = 0;
@@ -1088,7 +1099,7 @@ static int libxl_device_pci_add_xenstore(struct libxl_ctx
*ctx, uint32_t domid,
if (!back)
return ERROR_NOMEM;
- XL_LOG(ctx, XL_LOG_DEBUG, "Adding new pci device to xenstore\n");
+ XL_LOG(ctx, XL_LOG_DEBUG, "Adding new pci device to xenstore");
num = atoi(num_devs);
flexarray_set(back, boffset++, libxl_sprintf(ctx, "key-%d", num));
flexarray_set(back, boffset++, libxl_sprintf(ctx, PCI_BDF, pcidev->domain,
pcidev->bus, pcidev->dev, pcidev->func));
@@ -1140,7 +1151,7 @@ static int libxl_device_pci_remove_xenstore(struct
libxl_ctx *ctx, uint32_t domi
if (!is_hvm(ctx, domid)) {
if (libxl_wait_for_backend(ctx, be_path, "4") < 0) {
- XL_LOG(ctx, XL_LOG_DEBUG, "pci backend at %s is not ready\n");
+ XL_LOG(ctx, XL_LOG_DEBUG, "pci backend at %s is not ready");
return -1;
}
}
@@ -1154,7 +1165,7 @@ static int libxl_device_pci_remove_xenstore(struct
libxl_ctx *ctx, uint32_t domi
}
}
if (i == num) {
- XL_LOG(ctx, XL_LOG_ERROR, "Couldn't find the device on xenstore\n");
+ XL_LOG(ctx, XL_LOG_ERROR, "Couldn't find the device on xenstore");
return -1;
}
@@ -1196,7 +1207,7 @@ int libxl_device_pci_add(struct libxl_ctx *ctx, uint32_t
domid, libxl_device_pci
snprintf(path, sizeof(path),
"/local/domain/0/device-model/%d/command", domid);
xs_write(ctx->xsh, XBT_NULL, path, "pci-ins", strlen("pci-ins"));
if (libxl_wait_for_device_model(ctx, domid, "pci-inserted") < 0)
- XL_LOG(ctx, XL_LOG_ERROR, "Device Model didn't respond in time\n");
+ XL_LOG(ctx, XL_LOG_ERROR, "Device Model didn't respond in time");
snprintf(path, sizeof(path),
"/local/domain/0/device-model/%d/parameter", domid);
vdevfn = libxl_xs_read(ctx, XBT_NULL, path);
sscanf(vdevfn + 2, "%x", &pcidev->vdevfn);
@@ -1211,22 +1222,22 @@ int libxl_device_pci_add(struct libxl_ctx *ctx,
uint32_t domid, libxl_device_pci
int i;
if (f == NULL) {
- XL_LOG(ctx, XL_LOG_ERROR, "Couldn't open %s\n", sysfs_path);
+ XL_LOG_ERRNO(ctx, XL_LOG_ERROR, "Couldn't open %s", sysfs_path);
return -1;
}
for (i = 0; i < PROC_PCI_NUM_RESOURCES; i++) {
- fscanf(f, "0x%x 0x%x 0x%x\n", &start, &end, &flags);
+ fscanf(f, "0x%x 0x%x 0x%x", &start, &end, &flags);
size = end - start + 1;
if (start) {
if (flags & PCI_BAR_IO) {
rc = xc_domain_ioport_permission(ctx->xch, domid, start,
size, 1);
if (rc < 0)
- XL_LOG(ctx, XL_LOG_ERROR, "Error:
xc_domain_ioport_permission error 0x%x/0x%x: %d\n", start, size, rc);
+ XL_LOG_ERRNOVAL(ctx, XL_LOG_ERROR, rc, "Error:
xc_domain_ioport_permission error 0x%x/0x%x", start, size);
} else {
rc = xc_domain_iomem_permission(ctx->xch, domid,
start>>XC_PAGE_SHIFT,
(size+(XC_PAGE_SIZE-1))>>XC_PAGE_SHIFT, 1);
if (rc < 0)
- XL_LOG(ctx, XL_LOG_ERROR, "Error:
xc_domain_iomem_permission error 0x%x/0x%x: %d\n", start, size, rc);
+ XL_LOG_ERRNOVAL(ctx, XL_LOG_ERROR, rc, "Error:
xc_domain_iomem_permission error 0x%x/0x%x", start, size);
}
}
}
@@ -1235,25 +1246,25 @@ int libxl_device_pci_add(struct libxl_ctx *ctx,
uint32_t domid, libxl_device_pci
pcidev->bus, pcidev->dev, pcidev->func);
f = fopen(sysfs_path, "r");
if (f == NULL) {
- XL_LOG(ctx, XL_LOG_ERROR, "Couldn't open %s\n", sysfs_path);
+ XL_LOG_ERRNO(ctx, XL_LOG_ERROR, "Couldn't open %s", sysfs_path);
goto out;
}
fscanf(f, "%u", &irq);
if (irq) {
rc = xc_physdev_map_pirq(ctx->xch, domid, irq, &irq);
if (rc < 0) {
- XL_LOG(ctx, XL_LOG_ERROR, "Error: xc_physdev_map_pirq irq=%d:
%d\n", irq, rc);
+ XL_LOG_ERRNOVAL(ctx, XL_LOG_ERROR, rc, "Error:
xc_physdev_map_pirq irq=%d", irq);
}
rc = xc_domain_irq_permission(ctx->xch, domid, irq, 1);
if (rc < 0) {
- XL_LOG(ctx, XL_LOG_ERROR, "Error: xc_domain_irq_permission
irq=%d: %d\n", irq, rc);
+ XL_LOG_ERRNOVAL(ctx, XL_LOG_ERROR, rc, "Error:
xc_domain_irq_permission irq=%d", irq);
}
}
fclose(f);
}
out:
if ((rc = xc_assign_device(ctx->xch, domid, pcidev->value)) < 0)
- XL_LOG(ctx, XL_LOG_ERROR, "Error: xc_assign_device error %d\n", rc);
+ XL_LOG_ERRNOVAL(ctx, XL_LOG_ERROR, rc, "xc_assign_device failed");
libxl_device_pci_add_xenstore(ctx, domid, pcidev);
return 0;
@@ -1280,7 +1291,7 @@ int libxl_device_pci_remove(struct libxl_ctx *ctx,
uint32_t domid, libxl_device_
snprintf(path, sizeof(path),
"/local/domain/0/device-model/%d/command", domid);
xs_write(ctx->xsh, XBT_NULL, path, "pci-rem", strlen("pci-rem"));
if (libxl_wait_for_device_model(ctx, domid, "pci-removed") < 0) {
- XL_LOG(ctx, XL_LOG_ERROR, "Device Model didn't respond in time\n");
+ XL_LOG(ctx, XL_LOG_ERROR, "Device Model didn't respond in time");
return -1;
}
snprintf(path, sizeof(path), "/local/domain/0/device-model/%d/state",
domid);
@@ -1294,7 +1305,7 @@ int libxl_device_pci_remove(struct libxl_ctx *ctx,
uint32_t domid, libxl_device_
int i;
if (f == NULL) {
- XL_LOG(ctx, XL_LOG_ERROR, "Couldn't open %s\n", sysfs_path);
+ XL_LOG_ERRNO(ctx, XL_LOG_ERROR, "Couldn't open %s", sysfs_path);
goto skip1;
}
for (i = 0; i < PROC_PCI_NUM_RESOURCES; i++) {
@@ -1304,12 +1315,12 @@ int libxl_device_pci_remove(struct libxl_ctx *ctx,
uint32_t domid, libxl_device_
if (flags & PCI_BAR_IO) {
rc = xc_domain_ioport_permission(ctx->xch, domid, start,
size, 0);
if (rc < 0)
- XL_LOG(ctx, XL_LOG_ERROR, "Error:
xc_domain_ioport_permission error 0x%x/0x%x: %d\n", start, size, rc);
+ XL_LOG_ERRNOVAL(ctx, XL_LOG_ERROR, rc,
"xc_domain_ioport_permission error 0x%x/0x%x", start, size);
} else {
rc = xc_domain_iomem_permission(ctx->xch, domid,
start>>XC_PAGE_SHIFT,
(size+(XC_PAGE_SIZE-1))>>XC_PAGE_SHIFT, 0);
if (rc < 0)
- XL_LOG(ctx, XL_LOG_ERROR, "Error:
xc_domain_iomem_permission error 0x%x/0x%x: %d\n", start, size, rc);
+ XL_LOG_ERRNOVAL(ctx, XL_LOG_ERROR, rc,
"xc_domain_iomem_permission error 0x%x/0x%x", start, size);
}
}
}
@@ -1319,18 +1330,18 @@ skip1:
pcidev->bus, pcidev->dev, pcidev->func);
f = fopen(sysfs_path, "r");
if (f == NULL) {
- XL_LOG(ctx, XL_LOG_ERROR, "Couldn't open %s\n", sysfs_path);
+ XL_LOG_ERRNO(ctx, XL_LOG_ERROR, "Couldn't open %s", sysfs_path);
goto out;
}
fscanf(f, "%u", &irq);
if (irq) {
rc = xc_physdev_unmap_pirq(ctx->xch, domid, irq);
if (rc < 0) {
- XL_LOG(ctx, XL_LOG_ERROR, "Error: xc_physdev_map_pirq irq=%d:
%d\n", irq, rc);
+ XL_LOG_ERRNOVAL(ctx, XL_LOG_ERROR, rc, "xc_physdev_map_pirq
irq=%d", irq);
}
rc = xc_domain_irq_permission(ctx->xch, domid, irq, 0);
if (rc < 0) {
- XL_LOG(ctx, XL_LOG_ERROR, "Error: xc_domain_irq_permission
irq=%d: %d\n", irq, rc);
+ XL_LOG_ERRNOVAL(ctx, XL_LOG_ERROR, rc,
"xc_domain_irq_permission irq=%d", irq);
}
}
fclose(f);
@@ -1341,7 +1352,7 @@ out:
libxl_device_pci_flr(ctx, pcidev->domain, pcidev->bus, pcidev->dev,
pcidev->func);
if ((rc = xc_deassign_device(ctx->xch, domid, pcidev->value)) < 0)
- XL_LOG(ctx, XL_LOG_ERROR, "Error: xc_deassign_device error %d\n", rc);
+ XL_LOG_ERRNOVAL(ctx, XL_LOG_ERROR, rc, "xc_deassign_device failed");
return 0;
}
diff --git a/tools/libxl/libxl_device.c b/tools/libxl/libxl_device.c
index eee0a40..82a2a30 100644
--- a/tools/libxl/libxl_device.c
+++ b/tools/libxl/libxl_device.c
@@ -92,7 +92,7 @@ retry_transaction:
if (errno == EAGAIN)
goto retry_transaction;
else
- XL_LOG(ctx, XL_LOG_ERROR, "xs transaction failed errno=%d\n",
errno);
+ XL_LOG_ERRNO(ctx, XL_LOG_ERROR, "xs transaction failed");
}
return 0;
}
@@ -213,7 +213,7 @@ int libxl_devices_destroy(struct libxl_ctx *ctx, uint32_t
domid, int force)
path = libxl_sprintf(ctx, "/local/domain/%d/device", domid);
l1 = libxl_xs_directory(ctx, XBT_NULL, path, &num1);
if (!l1) {
- XL_LOG(ctx, XL_LOG_ERROR, "%s is empty\n", path);
+ XL_LOG(ctx, XL_LOG_ERROR, "%s is empty", path);
return -1;
}
for (i = 0; i < num1; i++) {
@@ -248,7 +248,7 @@ int libxl_devices_destroy(struct libxl_ctx *ctx, uint32_t
domid, int force)
if (!state || atoi(state) == 6) {
xs_unwatch(ctx->xsh, l1[0], l1[1]);
xs_rm(ctx->xsh, XBT_NULL, l1[1]);
- XL_LOG(ctx, XL_LOG_DEBUG, "Destroyed device backend at
%s\n", l1[1]);
+ XL_LOG(ctx, XL_LOG_DEBUG, "Destroyed device backend at
%s", l1[1]);
n_watches--;
}
}
@@ -267,15 +267,20 @@ int libxl_devices_destroy(struct libxl_ctx *ctx, uint32_t
domid, int force)
int libxl_device_pci_flr(struct libxl_ctx *ctx, unsigned int domain, unsigned
int bus,
unsigned int dev, unsigned int func)
{
+ char *do_flr= "/sys/bus/pci/drivers/pciback/do_flr";
FILE *fd;
- fd = fopen("/sys/bus/pci/drivers/pciback/do_flr", "w");
+ fd = fopen(do_flr, "w");
if (fd != NULL) {
fprintf(fd, PCI_BDF, domain, bus, dev, func);
fclose(fd);
return 0;
}
- XL_LOG(ctx, XL_LOG_ERROR, "Pciback doesn't support do_flr, cannot flr the
device\n");
+ if (errno == ENOENT) {
+ XL_LOG(ctx, XL_LOG_ERROR, "Pciback doesn't support do_flr, cannot flr
the device");
+ } else {
+ XL_LOG_ERRNO(ctx, XL_LOG_ERROR, "Failed to access pciback path %s",
do_flr);
+ }
return -1;
}
@@ -303,7 +308,7 @@ int libxl_wait_for_device_model(struct libxl_ctx *ctx,
uint32_t domid, char *sta
}
}
}
- XL_LOG(ctx, XL_LOG_ERROR, "Device Model not ready\n");
+ XL_LOG(ctx, XL_LOG_ERROR, "Device Model not ready");
return -1;
}
@@ -317,7 +322,13 @@ int libxl_wait_for_backend(struct libxl_ctx *ctx, char
*be_path, char *state)
while (watchdog > 0) {
p = xs_read(ctx->xsh, XBT_NULL, path, &len);
if (p == NULL) {
- XL_LOG(ctx, XL_LOG_ERROR, "Backend %s does not exist\n", be_path);
+ if (errno == ENOENT) {
+ XL_LOG(ctx, XL_LOG_ERROR, "Backend %s does not exist",
+ be_path);
+ } else {
+ XL_LOG_ERRNO(ctx, XL_LOG_ERROR, "Failed to access backend %s",
+ be_path);
+ }
return -1;
} else {
if (!strcmp(p, state)) {
@@ -328,7 +339,7 @@ int libxl_wait_for_backend(struct libxl_ctx *ctx, char
*be_path, char *state)
}
}
}
- XL_LOG(ctx, XL_LOG_ERROR, "Backend %s not ready\n", be_path);
+ XL_LOG(ctx, XL_LOG_ERROR, "Backend %s not ready", be_path);
return -1;
}
diff --git a/tools/libxl/libxl_dom.c b/tools/libxl/libxl_dom.c
index a98daee..eaea6f3 100644
--- a/tools/libxl/libxl_dom.c
+++ b/tools/libxl/libxl_dom.c
@@ -83,6 +83,9 @@ int build_post(struct libxl_ctx *ctx, uint32_t domid,
ents[9] = libxl_sprintf(ctx, "%lu", state->store_mfn);
dom_path = libxl_xs_get_dompath(ctx, domid);
+ if (!dom_path)
+ return ERROR_FAIL;
+
vm_path = xs_read(ctx->xsh, XBT_NULL, libxl_sprintf(ctx, "%s/vm",
dom_path), NULL);
retry_transaction:
t = xs_transaction_start(ctx->xsh);
@@ -107,7 +110,7 @@ int build_pv(struct libxl_ctx *ctx, uint32_t domid,
dom = xc_dom_allocate(info->u.pv.cmdline, info->u.pv.features);
if (!dom) {
- XL_LOG(ctx, XL_LOG_ERROR, "xc_dom_allocate failed: %d", dom);
+ XL_LOG_ERRNOVAL(ctx, XL_LOG_ERROR, dom, "xc_dom_allocate failed");
return -1;
}
if ((ret = xc_dom_linux_build(ctx->xch, dom, domid, info->max_memkb / 1024,
@@ -115,7 +118,7 @@ int build_pv(struct libxl_ctx *ctx, uint32_t domid,
state->store_port, &state->store_mfn,
state->console_port, &state->console_mfn))
!= 0) {
xc_dom_release(dom);
- XL_LOG(ctx, XL_LOG_ERROR, "xc_dom_linux_build failed: %d", ret);
+ XL_LOG_ERRNOVAL(ctx, XL_LOG_ERROR, ret, "xc_dom_linux_build failed");
return -2;
}
xc_dom_release(dom);
@@ -129,7 +132,7 @@ int build_hvm(struct libxl_ctx *ctx, uint32_t domid,
ret = xc_hvm_build(ctx->xch, domid, info->max_memkb / 1024, info->kernel);
if (ret) {
- XL_LOG(ctx, XL_LOG_ERROR, "hvm building failed: %d", ret);
+ XL_LOG_ERRNOVAL(ctx, XL_LOG_ERROR, ret, "hvm building failed");
return ERROR_FAIL;
}
ret = hvm_build_set_params(ctx->xch, domid, info->u.hvm.apic,
info->u.hvm.acpi,
@@ -137,7 +140,7 @@ int build_hvm(struct libxl_ctx *ctx, uint32_t domid,
info->max_vcpus,
state->store_port, &state->store_mfn);
if (ret) {
- XL_LOG(ctx, XL_LOG_ERROR, "hvm build set params failed: %d", ret);
+ XL_LOG_ERRNOVAL(ctx, XL_LOG_ERROR, ret, "hvm build set params failed");
return ERROR_FAIL;
}
xc_cpuid_apply_policy(ctx->xch, domid);
diff --git a/tools/libxl/libxl_exec.c b/tools/libxl/libxl_exec.c
index 8d7928b..8a589b6 100644
--- a/tools/libxl/libxl_exec.c
+++ b/tools/libxl/libxl_exec.c
@@ -28,7 +28,7 @@ int libxl_exec(struct libxl_ctx *ctx, int stdinfd, int
stdoutfd, int stderrfd,
pid = fork();
if (pid == -1) {
- XL_LOG(ctx, XL_LOG_ERROR, "fork failed");
+ XL_LOG_ERRNO(ctx, XL_LOG_ERROR, "fork failed");
return -1;
}
if (pid == 0) {
diff --git a/tools/libxl/libxl_internal.c b/tools/libxl/libxl_internal.c
index 407cf22..7ba0c97 100644
--- a/tools/libxl/libxl_internal.c
+++ b/tools/libxl/libxl_internal.c
@@ -146,14 +146,41 @@ char *libxl_dirname(struct libxl_ctx *ctx, const char *s)
return ptr;
}
-void xl_log(struct libxl_ctx *ctx, int loglevel, const char *file, int line,
const char *func, char *fmt, ...)
+void xl_logv(struct libxl_ctx *ctx, int loglevel, int errnoval,
+ const char *file, int line, const char *func,
+ char *fmt, va_list ap)
{
- va_list ap;
+ char *enomem = "[out of memory formatting log message]";
char *s;
- va_start(ap, fmt);
- vasprintf(&s, fmt, ap);
- va_end(ap);
+ int rc;
+
+ rc = vasprintf(&s, fmt, ap);
+ if (rc<0) { s = enomem; goto x; }
+
+ if (errnoval >= 0) {
+ char *errstr, *snew;
+ errstr = strerror(errnoval);
+ if (errstr)
+ rc = asprintf(&snew, "%s: %s", s, errstr);
+ else
+ rc = asprintf(&snew, "%s: unknown error number %d", s, errnoval);
+ free(s);
+ if (rc<0) { s = enomem; goto x; }
+ s = snew;
+ }
+ x:
ctx->log_callback(ctx->log_userdata, loglevel, file, line, func, s);
- free(s);
+ if (s != enomem)
+ free(s);
+}
+
+void xl_log(struct libxl_ctx *ctx, int loglevel, int errnoval,
+ const char *file, int line,
+ const char *func, char *fmt, ...)
+{
+ va_list ap;
+ va_start(ap, fmt);
+ xl_logv(ctx, loglevel, errnoval, file, line, func, fmt, ap);
+ va_end(ap);
}
diff --git a/tools/libxl/libxl_internal.h b/tools/libxl/libxl_internal.h
index d6835be..fe6aa00 100644
--- a/tools/libxl/libxl_internal.h
+++ b/tools/libxl/libxl_internal.h
@@ -37,9 +37,13 @@
#define XL_LOGGING_ENABLED
#ifdef XL_LOGGING_ENABLED
-#define XL_LOG(ctx, loglevel, _f, _a...) xl_log(ctx, loglevel, __FILE__,
__LINE__, __func__, _f, ##_a)
+#define XL_LOG(ctx, loglevel, _f, _a...) xl_log(ctx, -1, loglevel, __FILE__,
__LINE__, __func__, _f, ##_a)
+#define XL_LOG_ERRNO(ctx, loglevel, _f, _a...) xl_log(ctx, errno, loglevel,
__FILE__, __LINE__, __func__, _f, ##_a)
+#define XL_LOG_ERRNOVAL(ctx, errnoval, loglevel, _f, _a...) xl_log(ctx,
errnoval, loglevel, __FILE__, __LINE__, __func__, _f, ##_a)
#else
#define XL_LOG(ctx, loglevel, _f, _a...)
+#define XL_LOG_ERRNO(ctx, loglevel, _f, _a...)
+#define XL_LOG_ERRNOVAL(ctx, loglevel, errnoval, _f, _a...)
#endif
#define XL_LOG_DEBUG 3
@@ -47,7 +51,8 @@
#define XL_LOG_WARNING 1
#define XL_LOG_ERROR 0
-void xl_log(struct libxl_ctx *ctx, int loglevel, const char *file, int line,
const char *func, char *fmt, ...);
+void xl_logv(struct libxl_ctx *ctx, int errnoval, int loglevel, const char
*file, int line, const char *func, char *fmt, va_list al);
+void xl_log(struct libxl_ctx *ctx, int errnoval, int loglevel, const char
*file, int line, const char *func, char *fmt, ...);
struct libxl_domain_build_state_ {
uint32_t store_port;
@@ -97,7 +102,7 @@ int libxl_xs_writev(struct libxl_ctx *ctx, xs_transaction_t
t,
char *dir, char **kvs);
int libxl_xs_write(struct libxl_ctx *ctx, xs_transaction_t t,
char *path, char *fmt, ...);
-char *libxl_xs_get_dompath(struct libxl_ctx *ctx, uint32_t domid);
+char *libxl_xs_get_dompath(struct libxl_ctx *ctx, uint32_t domid); // logs errs
char *libxl_xs_read(struct libxl_ctx *ctx, xs_transaction_t t, char *path);
char **libxl_xs_directory(struct libxl_ctx *ctx, xs_transaction_t t, char
*path, unsigned int *nb);
diff --git a/tools/libxl/libxl_xshelp.c b/tools/libxl/libxl_xshelp.c
index 6286d02..f59eee7 100644
--- a/tools/libxl/libxl_xshelp.c
+++ b/tools/libxl/libxl_xshelp.c
@@ -95,6 +95,11 @@ char * libxl_xs_read(struct libxl_ctx *ctx, xs_transaction_t
t, char *path)
char *libxl_xs_get_dompath(struct libxl_ctx *ctx, uint32_t domid)
{
char *s = xs_get_domain_path(ctx->xsh, domid);
+ if (!s) {
+ XL_LOG_ERRNO(ctx, XL_LOG_ERROR, "failed to get dompath for %lu",
+ domid);
+ return NULL;
+ }
libxl_ptr_add(ctx, s);
return s;
}
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