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# HG changeset patch
# User Roger Pau Monne <roger.pau@entel.upc.edu>
# Date 1322751677 -3600
# Node ID 0abd9540788822b58585c8f2d29571e63fb68865
# Parent 097287f09ef3fba4f1d61d7073a77a122f3c597a
libxl: add libxl__forkexec function to libxl_exec

Add a new function to libxl_exec that performs a fork and executes
the passed arguments using libxl__exec.

Signed-off-by: Roger Pau Monne <roger.pau@entel.upc.edu>

diff -r 097287f09ef3 -r 0abd95407888 tools/libxl/libxl_exec.c
--- a/tools/libxl/libxl_exec.c Fri Sep 30 14:38:55 2011 +0200
+++ b/tools/libxl/libxl_exec.c Thu Dec 01 16:01:17 2011 +0100
@@ -450,6 +450,39 @@ int libxl__spawn_check(libxl__gc *gc, li
return ERROR_FAIL;
}

+int libxl__forkexec(libxl__gc *gc, int stdinfd, int stdoutfd,
+ int stderrfd, char **args)
+{
+ libxl_ctx *ctx = libxl__gc_owner(gc);
+ int status;
+ int rc = 0;
+ pid_t pid = fork();
+
+ switch (pid) {
+ case -1:
+ LIBXL__LOG_ERRNO(ctx, LIBXL__LOG_ERROR, "fork failed\n");
+ rc = -1;
+ break;
+ case 0:
+ libxl__exec(stdinfd, stdoutfd, stderrfd, args[0], args);
+ /* libxl__exec never returns */
+ default:
+ while (waitpid(pid, &status, 0) < 0) {
+ if (errno != EINTR) {
+ LIBXL__LOG_ERRNO(ctx, LIBXL__LOG_ERROR, "waitpid failed\n");
+ rc = -1;
+ break;
+ }
+ }
+ if (status)
+ libxl_report_child_exitstatus(ctx, LIBXL__LOG_ERROR,
+ args[0], pid, status);
+ rc = status;
+ break;
+ }
+ return rc;
+}
+
/*
* Local variables:
* mode: C
diff -r 097287f09ef3 -r 0abd95407888 tools/libxl/libxl_internal.h
--- a/tools/libxl/libxl_internal.h Fri Sep 30 14:38:55 2011 +0200
+++ b/tools/libxl/libxl_internal.h Thu Dec 01 16:01:17 2011 +0100
@@ -400,6 +400,22 @@ _hidden int libxl__spawn_check(libxl__gc
_hidden void libxl__exec(int stdinfd, int stdoutfd, int stderrfd,
const char *arg0, char **args); // logs errors, never returns

+/*
+ * libxl__forkexec - Executes a file synchronously
+ * gc: allocation pool
+ * stdinfd, stdoutfd, stderrfd: fds to pass to libxl__exec
+ * args: file to execute and arguments to pass in the following format
+ * args[0]: file to execute
+ * args[1]: first argument to pass to the called program
+ * ...
+ * args[n-1]: (n-1)th argument to pass to the called program
+ * args[n]: NULL
+ *
+ * Returns the exit status, as reported by waitpid.
+ */
+_hidden int libxl__forkexec(libxl__gc *gc, int stdinfd, int stdoutfd,
+ int stderrfd, char **args);
+
/* from xl_create */
_hidden int libxl__domain_make(libxl__gc *gc, libxl_domain_create_info *info, uint32_t *domid);
_hidden int libxl__domain_build(libxl__gc *gc,

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