intro.1, _exit.2, access.2, alarm.2, alloc_hugepages.2, arch_prctl.2, bind.2, chdir...

[thirdparty/man-pages.git] / man2 / tee.2

diff --git a/man2/tee.2 b/man2/tee.2
index 0514b15fbc3a2632a8a65679786224a3d22ad1a8..7ede3211e58ca3319296945bc8fe4a1db8f473ea 100644 (file)
--- a/man2/tee.2
+++ b/man2/tee.2
@@ -1,8 +1,7 @@
-.\" Hey Emacs! This file is -*- nroff -*- source.
-.\"
 .\" This manpage is Copyright (C) 2006 Jens Axboe
 .\" and Copyright (C) 2006 Michael Kerrisk <mtk.manpages@gmail.com>
 .\"
+.\" %%%LICENSE_START(VERBATIM)
 .\" Permission is granted to make and distribute verbatim copies of this
 .\" manual provided the copyright notice and this permission notice are
 .\" preserved on all copies.
@@ -22,18 +21,20 @@
 .\"
 .\" Formatted or processed versions of this manual, if unaccompanied by
 .\" the source, must acknowledge the copyright and authors of this work.
+.\" %%%LICENSE_END
 .\"
-.TH TEE 2 2006-04-28 "Linux" "Linux Programmer's Manual"
+.TH TEE 2 2012-05-04 "Linux" "Linux Programmer's Manual"
 .SH NAME
 tee \- duplicating pipe content
 .SH SYNOPSIS
 .nf
-.B #define _GNU_SOURCE
+.BR "#define _GNU_SOURCE" "         /* See feature_test_macros(7) */"
 .B #include <fcntl.h>
 
-.BI "long tee(int " fd_in ", int " fd_out ", size_t " len \
+.BI "ssize_t tee(int " fd_in ", int " fd_out ", size_t " len \
 ", unsigned int " flags );
 .fi
+.\" Return type was long before glibc 2.7
 .SH DESCRIPTION
 .\" Example programs http://brick.kernel.dk/snaps
 .\"
@@ -113,9 +114,10 @@ Out of memory.
 .SH VERSIONS
 The
 .BR tee ()
-system call first appeared in Linux 2.6.17.
-.SH "CONFORMING TO"
-This system call is Linux specific.
+system call first appeared in Linux 2.6.17;
+library support was added to glibc in version 2.5.
+.SH CONFORMING TO
+This system call is Linux-specific.
 .SH NOTES
 Conceptually,
 .BR tee ()
@@ -138,7 +140,6 @@ system call.
 #include <stdio.h>
 #include <stdlib.h>
 #include <unistd.h>
-#include <assert.h>
 #include <errno.h>
 #include <limits.h>
 
@@ -148,7 +149,10 @@ main(int argc, char *argv[])
     int fd;
     int len, slen;
 
-    assert(argc == 2);
+    if (argc != 2) {
+        fprintf(stderr, "Usage: %s <file>\\n", argv[0]);
+        exit(EXIT_FAILURE);
+    }
 
     fd = open(argv[1], O_WRONLY | O_CREAT | O_TRUNC, 0644);
     if (fd == \-1) {
@@ -192,5 +196,4 @@ main(int argc, char *argv[])
 .fi
 .SH SEE ALSO
 .BR splice (2),
-.BR vmsplice (2),
-.BR feature_test_macros (7)
+.BR vmsplice (2)