merge from gcc

1 files changed, 41 insertions, 0 deletions

diff --git a/include/libiberty.h b/include/libiberty.h
index c264cb2ab..6bd318e0f 100644
--- a/include/libiberty.h
+++ b/include/libiberty.h
@@ -448,6 +448,47 @@ extern const char *pex_run (struct pex_obj *obj, int flags,
 			    const char *outname, const char *errname,
 			    int *err);
 
+/* Return a `FILE' pointer FP for the standard input of the first
+   program in the pipeline; FP is opened for writing.  You must have
+   passed `PEX_USE_PIPES' to the `pex_init' call that returned OBJ.
+   You must close FP yourself with `fclose' to indicate that the
+   pipeline's input is complete.
+
+   The file descriptor underlying FP is marked not to be inherited by
+   child processes.
+
+   This call is not supported on systems which do not support pipes;
+   it returns with an error.  (We could implement it by writing a
+   temporary file, but then you would need to write all your data and
+   close FP before your first call to `pex_run' -- and that wouldn't
+   work on systems that do support pipes: the pipe would fill up, and
+   you would block.  So there isn't any easy way to conceal the
+   differences between the two types of systems.)
+
+   If you call both `pex_write_input' and `pex_read_output', be
+   careful to avoid deadlock.  If the output pipe fills up, so that
+   each program in the pipeline is waiting for the next to read more
+   data, and you fill the input pipe by writing more data to FP, then
+   there is no way to make progress: the only process that could read
+   data from the output pipe is you, but you are blocked on the input
+   pipe.  */
+
+extern FILE *pex_write_input (struct pex_obj *obj, int binary);
+
+/* Return a stream for a temporary file to pass to the first program
+   in the pipeline as input.  The file name is chosen as for pex_run.
+   pex_run closes the file automatically; don't close it yourself.  */
+
+extern FILE *pex_input_file (struct pex_obj *obj, int flags,
+                             const char *in_name);
+
+/* Return a stream for a pipe connected to the standard input of the
+   first program in the pipeline.  You must have passed
+   `PEX_USE_PIPES' to `pex_init'.  Close the returned stream
+   yourself.  */
+
+extern FILE *pex_input_pipe (struct pex_obj *obj, int binary);
+
 /* Read the standard output of the last program to be executed.
    pex_run can not be called after this.  BINARY should be non-zero if
    the file should be opened in binary mode; this is ignored on Unix.