Differences between version 3 and predecessor to the previous major change of stderr(3).
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| Newer page: | version 3 | Last edited on Friday, May 11, 2007 6:40:51 pm | by CraigBox | Revert |
| Older page: | version 1 | Last edited on Monday, June 3, 2002 11:57:34 pm | by perry | Revert |
@@ -1,18 +1,17 @@
-----
__NAME__
+stdin, stdout, stderr - standard I/O streams
-stdin, stdout, stderr - standard I/O streams
__SYNOPSIS__
-
-
-#include
+<verbatim>
+#include <stdio.h>
extern FILE stdin;
extern FILE stdout;
extern FILE stderr;
+</verbatim>
+
__DESCRIPTION__
-
Under normal circumstances every Unix program has three
streams opened for it when it starts up, one for input, one
for output, and one for printing diagnostic or error mes-
@@ -22,9 +21,9 @@
set up. (See also the ``Redirection'' section of
sh(1) .)
-The input stream is referred to as ``standard input''; the output stream is referred to as ``standard output''; and the error stream is referred to as ``standard error''. These terms are abbreviated to form the symbols used to refer to these files, namely stdin, stdout, and stderr.
+The input stream is referred to as ``standard input''; the output stream is referred to as ``standard output''; and the error stream is referred to as ``standard error''. These terms are abbreviated to form the symbols used to refer to these files, namely __
stdin__
, __
stdout__
, and __
stderr__
.
Each of these symbols is a stdio(3) macro of type
pointer to FILE, and can be used with functions like
@@ -59,15 +58,14 @@
introduced to make it possible to reassign stdin, stdout,
and stderr. The standard streams are closed by a call to
exit(3) and by nor- mal program
termination.
+
__SEE ALSO__
+sh(1), csh(1), open(2), fopen(3), stdio(3)
-sh(1), csh(1), open(2),
-fopen(3), stdio(3)
__CONSIDERATIONS__
-
The stream stderr is unbuffered. The stream stdout is
line-buffered when it points to a terminal. Partial lines
will not appear until fflush(3) or exit(3)
@@ -81,15 +79,9 @@
stdio buffering. (Indeed, normally terminal input is line
buffered in the kernel.) This kernel input handling can be
modified using calls like tcsetattr(3); see also
stty(1), and termios(3).
+
__CONFORMING TO__
-
The stdin, stdout, and stderr macros conform to
-ANSI X3.159-1989 (`` ANSI C
-
-
-
-
-Linux 2.0 March 24, 1998 1
-----
+ANSI X3.159-1989 (`` ANSI C''), and this standard also stipulates that these three streams shall be open at program startup.
