Improve doc string of 'call-process'

* src/callproc.c (Fcall_process): Clarify DESTINATION in the
doc string.

1 files changed, 13 insertions, 8 deletions

diff --git a/src/callproc.c b/src/callproc.c
index 973f324139c..8f1da2fd7a5 100644
--- a/src/callproc.c
+++ b/src/callproc.c
@@ -221,15 +221,20 @@ DEFUN ("call-process", Fcall_process, Scall_process, 1, MANY, 0,
        doc: /* Call PROGRAM synchronously in separate process.
 The remaining arguments are optional.
 The program's input comes from file INFILE (nil means `/dev/null').
-Insert output in DESTINATION before point; t means current buffer; nil for DESTINATION
- means discard it; 0 means discard and don't wait; and `(:file FILE)', where
- FILE is a file name string, means that it should be written to that file
- (if the file already exists it is overwritten).
+
+Third argument DESTINATION specifies how to handle program's output.
+If DESTINATION is a buffer, or t that stands for the current buffer,
+ it means insert output in that buffer before point.
+If DESTINATION is nil, it means discard output; 0 means discard
+ and don't wait for the program to terminate.
+If DESTINATION is `(:file FILE)', where FILE is a file name string,
+ it means that output should be written to that file (if the file
+ already exists it is overwritten).
 DESTINATION can also have the form (REAL-BUFFER STDERR-FILE); in that case,
-REAL-BUFFER says what to do with standard output, as above,
-while STDERR-FILE says what to do with standard error in the child.
-STDERR-FILE may be nil (discard standard error output),
-t (mix it with ordinary output), or a file name string.
+ REAL-BUFFER says what to do with standard output, as above,
+ while STDERR-FILE says what to do with standard error in the child.
+ STDERR-FILE may be nil (discard standard error output),
+ t (mix it with ordinary output), or a file name string.
 
 Fourth arg DISPLAY non-nil means redisplay buffer as output is inserted.
 Remaining arguments are strings passed as command arguments to PROGRAM.