[libvirt] [PATCH 1/3] utils: Implement virCommandPassFDGetFDIndex
Martin Kletzander
mkletzan at redhat.com
Tue Feb 24 13:34:43 UTC 2015
On Mon, Feb 23, 2015 at 06:50:46AM -0500, Stefan Berger wrote:
>Implement virCommandPassFDGetFDIndex to determine the index a given
>file descriptor will have when passed to the child process. When this
>function is called, a flag is set to prevent the reordering of the
>file descriptors.
>
>Signed-off-by: Stefan Berger <stefanb at linux.vnet.ibm.com>
>---
> src/libvirt_private.syms | 1 +
> src/util/vircommand.c | 33 +++++++++++++++++++++++++++++++++
> src/util/vircommand.h | 3 +++
> 3 files changed, 37 insertions(+)
>
>diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
>index c156b40..aadb833 100644
>--- a/src/libvirt_private.syms
>+++ b/src/libvirt_private.syms
>@@ -1213,6 +1213,7 @@ virCommandNewArgList;
> virCommandNewArgs;
> virCommandNonblockingFDs;
> virCommandPassFD;
>+virCommandPassFDGetFDIndex;
> virCommandPassListenFDs;
> virCommandRawStatus;
> virCommandRequireHandshake;
>diff --git a/src/util/vircommand.c b/src/util/vircommand.c
>index 6527d85..2616446 100644
>--- a/src/util/vircommand.c
>+++ b/src/util/vircommand.c
>@@ -67,6 +67,7 @@ enum {
> VIR_EXEC_RUN_SYNC = (1 << 3),
> VIR_EXEC_ASYNC_IO = (1 << 4),
> VIR_EXEC_LISTEN_FDS = (1 << 5),
>+ VIR_EXEC_FIXED_FDS = (1 << 6),
The descriptors shouldn't get reordered *unless* there is
VIR_EXEC_LISTEN_FDS flag added, so FIXED_FDS shouldn't be necessary.
Or is there a bug in that approach that needs fixing?
> };
>
> typedef struct _virCommandFD virCommandFD;
>@@ -214,6 +215,12 @@ virCommandReorderFDs(virCommandPtr cmd)
> if (!cmd || cmd->has_error || !cmd->npassfd)
> return;
>
>+ if ((cmd->flags & VIR_EXEC_FIXED_FDS)) {
>+ virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
>+ _("The fds are fixed and cannot be reordered"));
>+ goto error;
>+ }
>+
> for (i = 0; i < cmd->npassfd; i++)
> maxfd = MAX(cmd->passfd[i].fd, maxfd);
>
>@@ -1019,6 +1026,32 @@ virCommandPassListenFDs(virCommandPtr cmd)
> cmd->flags |= VIR_EXEC_LISTEN_FDS;
> }
>
>+/*
>+ * virCommandPassFDGetFDIndex:
>+ * @cmd: pointer to virCommand
>+ * @fd: FD to get index of
>+ *
>+ * Determine the index of the FD in the transfer set.
>+ *
>+ * Returns index >= 0 if @set contains @fd,
>+ * -1 otherwise.
>+ */
>+int
>+virCommandPassFDGetFDIndex(virCommandPtr cmd, int fd)
>+{
>+ size_t i = 0;
>+
>+ while (i < cmd->npassfd) {
>+ if (cmd->passfd[i].fd == fd) {
>+ cmd->flags |= VIR_EXEC_FIXED_FDS;
>+ return i;
>+ }
>+ i++;
>+ }
>+
>+ return -1;
>+}
>+
> /**
> * virCommandSetPidFile:
> * @cmd: the command to modify
>diff --git a/src/util/vircommand.h b/src/util/vircommand.h
>index bf65de4..198da2f 100644
>--- a/src/util/vircommand.h
>+++ b/src/util/vircommand.h
>@@ -62,6 +62,9 @@ void virCommandPassFD(virCommandPtr cmd,
>
> void virCommandPassListenFDs(virCommandPtr cmd);
>
>+int virCommandPassFDGetFDIndex(virCommandPtr cmd,
>+ int fd);
>+
> void virCommandSetPidFile(virCommandPtr cmd,
> const char *pidfile) ATTRIBUTE_NONNULL(2);
>
>--
>1.9.3
>
>--
>libvir-list mailing list
>libvir-list at redhat.com
>https://www.redhat.com/mailman/listinfo/libvir-list
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