/**
* virConfParseValue:
* @ctxt: the parsing context
*
* Parse one value
*
* Returns a pointer to the value or NULL in case of error
*/
static virConfValuePtr
virConfParseValue(virConfParserCtxtPtr ctxt)
{
virConfValuePtr ret, lst = NULL, tmp, prev;
virConfType type = VIR_CONF_NONE;
char *str = NULL;
long l = 0;
SKIP_BLANKS;
if (ctxt->cur >= ctxt->end) {
virConfError(ctxt, VIR_ERR_CONF_SYNTAX, _("expecting a value"));
return NULL;
}
if ((CUR == '"') || (CUR == '\'') ||
(ctxt->conf->flags & VIR_CONF_FLAG_LXC_FORMAT)) {
type = VIR_CONF_STRING;
str = virConfParseString(ctxt);
if (str == NULL)
return NULL;
} else if (CUR == '[') {
if (ctxt->conf->flags & VIR_CONF_FLAG_VMX_FORMAT) {
virConfError(ctxt, VIR_ERR_CONF_SYNTAX,
_("lists not allowed in VMX format"));
return NULL;
}
type = VIR_CONF_LIST;
NEXT;
SKIP_BLANKS_AND_EOL;
if ((ctxt->cur < ctxt->end) && (CUR != ']')) {
if ((lst = virConfParseValue(ctxt)) == NULL)
return NULL;
SKIP_BLANKS_AND_EOL;
}
while ((ctxt->cur < ctxt->end) && (CUR != ']')) {
/* Tell Clang that when execution reaches this point
"lst" is guaranteed to be non-NULL. This stops it
from issuing an invalid NULL-dereference warning about
"prev = lst; while (prev->next..." below. */
sa_assert(lst);
if (CUR != ',') {
virConfError(ctxt, VIR_ERR_CONF_SYNTAX,
_("expecting a separator in list"));
virConfFreeList(lst);
return NULL;
}
NEXT;
SKIP_BLANKS_AND_EOL;
if (CUR == ']') {
break;
}
tmp = virConfParseValue(ctxt);
if (tmp == NULL) {
virConfFreeList(lst);
return NULL;
}
prev = lst;
while (prev->next != NULL) prev = prev->next;
prev->next = tmp;
SKIP_BLANKS_AND_EOL;
}
if (CUR == ']') {
NEXT;
} else {
virConfError(ctxt, VIR_ERR_CONF_SYNTAX,
_("list is not closed with ]"));
virConfFreeList(lst);
return NULL;
}
} else if (c_isdigit(CUR) || (CUR == '-') || (CUR == '+')) {
if (ctxt->conf->flags & VIR_CONF_FLAG_VMX_FORMAT) {
virConfError(ctxt, VIR_ERR_CONF_SYNTAX,
_("numbers not allowed in VMX format"));
return NULL;
}
if (virConfParseLong(ctxt, &l) < 0) {
return NULL;
}
type = VIR_CONF_LONG;
} else {
virConfError(ctxt, VIR_ERR_CONF_SYNTAX, _("expecting a value"));
return NULL;
}
if (VIR_ALLOC(ret) < 0) {
virConfFreeList(lst);
VIR_FREE(str);
return NULL;
}
ret->type = type;
ret->l = l;
ret->str = str;
ret->list = lst;
return ret;
}
/*
* Manage input and output to the child process.
*/
static int
virCommandProcessIO(virCommandPtr cmd)
{
int infd = -1, outfd = -1, errfd = -1;
size_t inlen = 0, outlen = 0, errlen = 0;
size_t inoff = 0;
int ret = 0;
/* With an input buffer, feed data to child
* via pipe */
if (cmd->inbuf) {
inlen = strlen(cmd->inbuf);
infd = cmd->inpipe;
}
/* With out/err buffer, the outfd/errfd have been filled with an
* FD for us. Guarantee an allocated string with partial results
* even if we encounter a later failure, as well as freeing any
* results accumulated over a prior run of the same command. */
if (cmd->outbuf) {
outfd = cmd->outfd;
if (VIR_REALLOC_N(*cmd->outbuf, 1) < 0) {
virReportOOMError();
ret = -1;
}
}
if (cmd->errbuf) {
errfd = cmd->errfd;
if (VIR_REALLOC_N(*cmd->errbuf, 1) < 0) {
virReportOOMError();
ret = -1;
}
}
if (ret == -1)
goto cleanup;
ret = -1;
for (;;) {
int i;
struct pollfd fds[3];
int nfds = 0;
if (infd != -1) {
fds[nfds].fd = infd;
fds[nfds].events = POLLOUT;
nfds++;
}
if (outfd != -1) {
fds[nfds].fd = outfd;
fds[nfds].events = POLLIN;
nfds++;
}
if (errfd != -1) {
fds[nfds].fd = errfd;
fds[nfds].events = POLLIN;
nfds++;
}
if (nfds == 0)
break;
if (poll(fds, nfds, -1) < 0) {
if ((errno == EAGAIN) || (errno == EINTR))
continue;
virReportSystemError(errno, "%s",
_("unable to poll on child"));
goto cleanup;
}
for (i = 0; i < nfds ; i++) {
if (fds[i].fd == errfd ||
fds[i].fd == outfd) {
char data[1024];
char **buf;
size_t *len;
int done;
if (fds[i].fd == outfd) {
buf = cmd->outbuf;
len = &outlen;
} else {
buf = cmd->errbuf;
len = &errlen;
}
/* Silence a false positive from clang. */
sa_assert(buf);
done = read(fds[i].fd, data, sizeof(data));
if (done < 0) {
if (errno != EINTR &&
errno != EAGAIN) {
virReportSystemError(errno, "%s",
_("unable to write to child input"));
goto cleanup;
}
} else if (done == 0) {
if (fds[i].fd == outfd)
outfd = -1;
else
errfd = -1;
} else {
if (VIR_REALLOC_N(*buf, *len + done + 1) < 0) {
virReportOOMError();
goto cleanup;
}
memcpy(*buf + *len, data, done);
*len += done;
}
} else {
int done;
done = write(infd, cmd->inbuf + inoff,
inlen - inoff);
if (done < 0) {
if (errno != EINTR &&
errno != EAGAIN) {
virReportSystemError(errno, "%s",
_("unable to write to child input"));
goto cleanup;
}
} else {
inoff += done;
if (inoff == inlen) {
int tmpfd = infd;
if (VIR_CLOSE(infd) < 0)
VIR_DEBUG("ignoring failed close on fd %d", tmpfd);
}
}
}
}
}
ret = 0;
cleanup:
if (cmd->outbuf && *cmd->outbuf)
(*cmd->outbuf)[outlen] = '\0';
if (cmd->errbuf && *cmd->errbuf)
(*cmd->errbuf)[errlen] = '\0';
return ret;
}
static int virCgroupMakeGroup(virCgroupPtr parent, virCgroupPtr group,
int create, unsigned int flags)
{
int i;
int rc = 0;
VIR_DEBUG("Make group %s", group->path);
for (i = 0 ; i < VIR_CGROUP_CONTROLLER_LAST ; i++) {
char *path = NULL;
/* Skip over controllers that aren't mounted */
if (!group->controllers[i].mountPoint)
continue;
/* We need to control cpu bandwidth for each vcpu now */
if ((flags & VIR_CGROUP_VCPU) &&
(i != VIR_CGROUP_CONTROLLER_CPU &&
i != VIR_CGROUP_CONTROLLER_CPUACCT)) {
/* treat it as unmounted and we can use virCgroupAddTask */
VIR_FREE(group->controllers[i].mountPoint);
continue;
}
rc = virCgroupPathOfController(group, i, "", &path);
if (rc < 0)
return rc;
/* As of Feb 2011, clang can't see that the above function
* call did not modify group. */
sa_assert(group->controllers[i].mountPoint);
VIR_DEBUG("Make controller %s", path);
if (access(path, F_OK) != 0) {
if (!create ||
mkdir(path, 0755) < 0) {
/* With a kernel that doesn't support multi-level directory
* for blkio controller, libvirt will fail and disable all
* other controllers even though they are available. So
* treat blkio as unmounted if mkdir fails. */
if (i == VIR_CGROUP_CONTROLLER_BLKIO) {
rc = 0;
VIR_FREE(group->controllers[i].mountPoint);
VIR_FREE(path);
continue;
} else {
rc = -errno;
VIR_FREE(path);
break;
}
}
if (group->controllers[VIR_CGROUP_CONTROLLER_CPUSET].mountPoint != NULL &&
(i == VIR_CGROUP_CONTROLLER_CPUSET ||
STREQ(group->controllers[i].mountPoint, group->controllers[VIR_CGROUP_CONTROLLER_CPUSET].mountPoint))) {
rc = virCgroupCpuSetInherit(parent, group);
if (rc != 0) {
VIR_FREE(path);
break;
}
}
/*
* Note that virCgroupSetMemoryUseHierarchy should always be
* called prior to creating subcgroups and attaching tasks.
*/
if ((flags & VIR_CGROUP_MEM_HIERACHY) &&
(group->controllers[VIR_CGROUP_CONTROLLER_MEMORY].mountPoint != NULL) &&
(i == VIR_CGROUP_CONTROLLER_MEMORY ||
STREQ(group->controllers[i].mountPoint, group->controllers[VIR_CGROUP_CONTROLLER_MEMORY].mountPoint))) {
rc = virCgroupSetMemoryUseHierarchy(group);
if (rc != 0) {
VIR_FREE(path);
break;
}
}
}
VIR_FREE(path);
}
return rc;
}
/**
* virBitmapParse:
* @str: points to a string representing a human-readable bitmap
* @terminator: character separating the bitmap to parse
* @bitmap: a bitmap created from @str
* @bitmapSize: the upper limit of num of bits in created bitmap
*
* This function is the counterpart of virBitmapFormat. This function creates
* a bitmap, in which bits are set according to the content of @str.
*
* @str is a comma separated string of fields N, which means a number of bit
* to set, and ^N, which means to unset the bit, and N-M for ranges of bits
* to set.
*
* To allow parsing of bitmaps within larger strings it is possible to set
* a termination character in the argument @terminator. When the character
* in @terminator is encountered in @str, the parsing of the bitmap stops.
* Pass 0 as @terminator if it is not needed. Whitespace characters may not
* be used as terminators.
*
* Returns the number of bits set in @bitmap, or -1 in case of error.
*/
int
virBitmapParse(const char *str,
char terminator,
virBitmapPtr *bitmap,
size_t bitmapSize)
{
int ret = 0;
bool neg = false;
const char *cur;
char *tmp;
size_t i;
int start, last;
if (!str)
return -1;
cur = str;
virSkipSpaces(&cur);
if (*cur == 0)
return -1;
*bitmap = virBitmapNew(bitmapSize);
if (!*bitmap)
return -1;
while (*cur != 0 && *cur != terminator) {
/*
* 3 constructs are allowed:
* - N : a single CPU number
* - N-M : a range of CPU numbers with N < M
* - ^N : remove a single CPU number from the current set
*/
if (*cur == '^') {
cur++;
neg = true;
}
if (!c_isdigit(*cur))
goto parse_error;
if (virStrToLong_i(cur, &tmp, 10, &start) < 0)
goto parse_error;
if (start < 0)
goto parse_error;
cur = tmp;
virSkipSpaces(&cur);
if (*cur == ',' || *cur == 0 || *cur == terminator) {
if (neg) {
if (virBitmapIsSet(*bitmap, start)) {
ignore_value(virBitmapClearBit(*bitmap, start));
ret--;
}
} else {
if (!virBitmapIsSet(*bitmap, start)) {
ignore_value(virBitmapSetBit(*bitmap, start));
ret++;
}
}
} else if (*cur == '-') {
if (neg)
goto parse_error;
cur++;
virSkipSpaces(&cur);
if (virStrToLong_i(cur, &tmp, 10, &last) < 0)
goto parse_error;
if (last < start)
goto parse_error;
cur = tmp;
for (i = start; i <= last; i++) {
if (!virBitmapIsSet(*bitmap, i)) {
ignore_value(virBitmapSetBit(*bitmap, i));
ret++;
}
}
virSkipSpaces(&cur);
}
if (*cur == ',') {
cur++;
virSkipSpaces(&cur);
neg = false;
} else if (*cur == 0 || *cur == terminator) {
break;
} else {
goto parse_error;
}
}
sa_assert(ret >= 0);
return ret;
parse_error:
virBitmapFree(*bitmap);
*bitmap = NULL;
return -1;
}
