monitor: Enable adding an inherited fd to an fd set
qmp_add_fd() gets an fd that was received over a socket with SCM_RIGHTS and adds it to an fd set. This patch adds support that will enable adding an fd that was inherited on the command line to an fd set. Note: All of the code added to monitor_fdset_add_fd(), with the exception of the error path for non-valid fdset-id, is code motion from qmp_add_fd(). Signed-off-by: Corey Bryant <coreyb@linux.vnet.ibm.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Corey Bryant
Kevin Wolf
parent
9ac54af0c3
commit
e446f70d54
157
monitor.c
157
monitor.c
@ -2135,8 +2135,6 @@ AddfdInfo *qmp_add_fd(bool has_fdset_id, int64_t fdset_id, bool has_opaque,
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{
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{
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int fd;
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int fd;
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Monitor *mon = cur_mon;
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Monitor *mon = cur_mon;
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MonFdset *mon_fdset = NULL;
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MonFdsetFd *mon_fdset_fd;
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AddfdInfo *fdinfo;
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AddfdInfo *fdinfo;
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fd = qemu_chr_fe_get_msgfd(mon->chr);
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fd = qemu_chr_fe_get_msgfd(mon->chr);
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@ -2145,78 +2143,12 @@ AddfdInfo *qmp_add_fd(bool has_fdset_id, int64_t fdset_id, bool has_opaque,
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goto error;
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goto error;
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}
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}
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if (has_fdset_id) {
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fdinfo = monitor_fdset_add_fd(fd, has_fdset_id, fdset_id,
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QLIST_FOREACH(mon_fdset, &mon_fdsets, next) {
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has_opaque, opaque, errp);
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/* Break if match found or match impossible due to ordering by ID */
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if (fdinfo) {
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if (fdset_id <= mon_fdset->id) {
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return fdinfo;
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if (fdset_id < mon_fdset->id) {
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mon_fdset = NULL;
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}
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break;
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}
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}
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}
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}
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if (mon_fdset == NULL) {
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int64_t fdset_id_prev = -1;
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MonFdset *mon_fdset_cur = QLIST_FIRST(&mon_fdsets);
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if (has_fdset_id) {
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if (fdset_id < 0) {
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error_set(errp, QERR_INVALID_PARAMETER_VALUE, "fdset-id",
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"a non-negative value");
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goto error;
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}
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/* Use specified fdset ID */
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QLIST_FOREACH(mon_fdset, &mon_fdsets, next) {
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mon_fdset_cur = mon_fdset;
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if (fdset_id < mon_fdset_cur->id) {
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break;
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}
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}
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} else {
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/* Use first available fdset ID */
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QLIST_FOREACH(mon_fdset, &mon_fdsets, next) {
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mon_fdset_cur = mon_fdset;
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if (fdset_id_prev == mon_fdset_cur->id - 1) {
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fdset_id_prev = mon_fdset_cur->id;
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continue;
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}
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break;
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}
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}
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mon_fdset = g_malloc0(sizeof(*mon_fdset));
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if (has_fdset_id) {
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mon_fdset->id = fdset_id;
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} else {
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mon_fdset->id = fdset_id_prev + 1;
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}
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/* The fdset list is ordered by fdset ID */
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if (!mon_fdset_cur) {
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QLIST_INSERT_HEAD(&mon_fdsets, mon_fdset, next);
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} else if (mon_fdset->id < mon_fdset_cur->id) {
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QLIST_INSERT_BEFORE(mon_fdset_cur, mon_fdset, next);
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} else {
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QLIST_INSERT_AFTER(mon_fdset_cur, mon_fdset, next);
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}
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}
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mon_fdset_fd = g_malloc0(sizeof(*mon_fdset_fd));
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mon_fdset_fd->fd = fd;
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mon_fdset_fd->removed = false;
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if (has_opaque) {
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mon_fdset_fd->opaque = g_strdup(opaque);
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}
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QLIST_INSERT_HEAD(&mon_fdset->fds, mon_fdset_fd, next);
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fdinfo = g_malloc0(sizeof(*fdinfo));
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fdinfo->fdset_id = mon_fdset->id;
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fdinfo->fd = mon_fdset_fd->fd;
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return fdinfo;
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error:
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error:
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if (fd != -1) {
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if (fd != -1) {
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close(fd);
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close(fd);
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@ -2301,6 +2233,87 @@ FdsetInfoList *qmp_query_fdsets(Error **errp)
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return fdset_list;
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return fdset_list;
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}
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}
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AddfdInfo *monitor_fdset_add_fd(int fd, bool has_fdset_id, int64_t fdset_id,
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bool has_opaque, const char *opaque,
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Error **errp)
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{
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MonFdset *mon_fdset = NULL;
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MonFdsetFd *mon_fdset_fd;
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AddfdInfo *fdinfo;
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if (has_fdset_id) {
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QLIST_FOREACH(mon_fdset, &mon_fdsets, next) {
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/* Break if match found or match impossible due to ordering by ID */
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if (fdset_id <= mon_fdset->id) {
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if (fdset_id < mon_fdset->id) {
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mon_fdset = NULL;
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}
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break;
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}
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}
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}
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if (mon_fdset == NULL) {
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int64_t fdset_id_prev = -1;
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MonFdset *mon_fdset_cur = QLIST_FIRST(&mon_fdsets);
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if (has_fdset_id) {
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if (fdset_id < 0) {
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error_set(errp, QERR_INVALID_PARAMETER_VALUE, "fdset-id",
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"a non-negative value");
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return NULL;
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}
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/* Use specified fdset ID */
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QLIST_FOREACH(mon_fdset, &mon_fdsets, next) {
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mon_fdset_cur = mon_fdset;
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if (fdset_id < mon_fdset_cur->id) {
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break;
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}
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}
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} else {
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/* Use first available fdset ID */
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QLIST_FOREACH(mon_fdset, &mon_fdsets, next) {
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mon_fdset_cur = mon_fdset;
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if (fdset_id_prev == mon_fdset_cur->id - 1) {
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fdset_id_prev = mon_fdset_cur->id;
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continue;
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}
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break;
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}
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}
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mon_fdset = g_malloc0(sizeof(*mon_fdset));
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if (has_fdset_id) {
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mon_fdset->id = fdset_id;
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} else {
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mon_fdset->id = fdset_id_prev + 1;
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}
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/* The fdset list is ordered by fdset ID */
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if (!mon_fdset_cur) {
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QLIST_INSERT_HEAD(&mon_fdsets, mon_fdset, next);
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} else if (mon_fdset->id < mon_fdset_cur->id) {
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QLIST_INSERT_BEFORE(mon_fdset_cur, mon_fdset, next);
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} else {
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QLIST_INSERT_AFTER(mon_fdset_cur, mon_fdset, next);
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}
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}
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mon_fdset_fd = g_malloc0(sizeof(*mon_fdset_fd));
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mon_fdset_fd->fd = fd;
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mon_fdset_fd->removed = false;
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if (has_opaque) {
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mon_fdset_fd->opaque = g_strdup(opaque);
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}
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QLIST_INSERT_HEAD(&mon_fdset->fds, mon_fdset_fd, next);
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fdinfo = g_malloc0(sizeof(*fdinfo));
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fdinfo->fdset_id = mon_fdset->id;
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fdinfo->fd = mon_fdset_fd->fd;
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return fdinfo;
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}
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int monitor_fdset_get_fd(int64_t fdset_id, int flags)
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int monitor_fdset_get_fd(int64_t fdset_id, int flags)
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{
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{
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#ifndef _WIN32
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#ifndef _WIN32
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@ -90,6 +90,9 @@ int qmp_qom_set(Monitor *mon, const QDict *qdict, QObject **ret);
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int qmp_qom_get(Monitor *mon, const QDict *qdict, QObject **ret);
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int qmp_qom_get(Monitor *mon, const QDict *qdict, QObject **ret);
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AddfdInfo *monitor_fdset_add_fd(int fd, bool has_fdset_id, int64_t fdset_id,
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bool has_opaque, const char *opaque,
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Error **errp);
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int monitor_fdset_get_fd(int64_t fdset_id, int flags);
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int monitor_fdset_get_fd(int64_t fdset_id, int flags);
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int monitor_fdset_dup_fd_add(int64_t fdset_id, int dup_fd);
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int monitor_fdset_dup_fd_add(int64_t fdset_id, int dup_fd);
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int monitor_fdset_dup_fd_remove(int dup_fd);
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int monitor_fdset_dup_fd_remove(int dup_fd);
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