sbase

commit 894b42a8850b43f4cd84505114532eeac6f1925a
parent 164e0c171fd4a72bdd427e3e4c0f1e84777d6b87
Author: Connor Lane Smith <cls@lubutu.com>
Date:   Thu,  2 Jun 2011 21:15:35 +0100

add tty
Diffstat:
M
Makefile
 | 
2
+-
A
tty.1
 | 
13
+++++++++++++
A
tty.c
 | 
24
++++++++++++++++++++++++
M
uname.c
 | 
2
+-

4 files changed, 39 insertions(+), 2 deletions(-)
diff --git a/Makefile b/Makefile
@@ -6,7 +6,7 @@ LIB = util/afgets.o util/agetcwd.o util/concat.o util/enmasse.o util/eprintf.o \
 
 SRC = basename.c cat.c chmod.c chown.c date.c dirname.c echo.c false.c grep.c \
       head.c ln.c ls.c mkdir.c mkfifo.c nl.c pwd.c rm.c sleep.c sort.c tail.c \
-      tee.c touch.c true.c uname.c wc.c
+      tee.c touch.c true.c tty.c uname.c wc.c
 OBJ = $(SRC:.c=.o) $(LIB)
 BIN = $(SRC:.c=)
 MAN = $(SRC:.c=.1)
diff --git a/tty.1 b/tty.1
@@ -0,0 +1,13 @@
+.TH TTY 1 sbase\-VERSION
+.SH NAME
+tty \- print terminal name
+.SH SYNOPSIS
+.B tty
+.SH DESCRIPTION
+.B tty
+prints the name of the terminal open on stdin.
+.P
+The status code is 0 if stdin is a terminal, and 1 if not.  If an error occurred
+the status code is 2.
+.SH SEE ALSO
+.IR ttyname (3)
diff --git a/tty.c b/tty.c
@@ -0,0 +1,24 @@
+/* See LICENSE file for copyright and license details. */
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+int
+main(void)
+{
+	char *tty;
+
+	if((tty = ttyname(STDIN_FILENO))) {
+		puts(tty);
+		return 0;
+	}
+	else if(errno == ENOTTY) {
+		puts("not a tty");
+		return 1;
+	}
+	else {
+		perror("ttyname");
+		return 2;
+	}
+}
diff --git a/uname.c b/uname.c
@@ -41,7 +41,7 @@ main(int argc, char *argv[])
 			exit(EXIT_FAILURE);
 		}
 	if(uname(&u) == -1)
-		eprintf("uname failed:");
+		eprintf("uname:");
 
 	if(sflag || !(nflag || rflag || vflag || mflag))
 		printf("%s ", u.sysname);