1 /* tee - read from standard input and write to standard output and files.
2 Copyright (C) 1985, 1990-2006, 2008-2012 Free Software Foundation, Inc.
4 This program is free software: you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation, either version 3 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program. If not, see <http://www.gnu.org/licenses/>. */
17 /* Mike Parker, Richard M. Stallman, and David MacKenzie */
20 #include <sys/types.h>
30 /* The official name of this program (e.g., no `g' prefix). */
31 #define PROGRAM_NAME "tee"
34 proper_name ("Mike Parker"), \
35 proper_name ("Richard M. Stallman"), \
36 proper_name ("David MacKenzie")
38 static bool tee_files (int nfiles
, const char **files
);
40 /* If true, append to output files rather than truncating them. */
43 /* If true, ignore interrupts. */
44 static bool ignore_interrupts
;
46 static struct option
const long_options
[] =
48 {"append", no_argument
, NULL
, 'a'},
49 {"ignore-interrupts", no_argument
, NULL
, 'i'},
50 {GETOPT_HELP_OPTION_DECL
},
51 {GETOPT_VERSION_OPTION_DECL
},
58 if (status
!= EXIT_SUCCESS
)
59 fprintf (stderr
, _("Try `%s --help' for more information.\n"),
63 printf (_("Usage: %s [OPTION]... [FILE]...\n"), program_name
);
65 Copy standard input to each FILE, and also to standard output.\n\
67 -a, --append append to the given FILEs, do not overwrite\n\
68 -i, --ignore-interrupts ignore interrupt signals\n\
70 fputs (HELP_OPTION_DESCRIPTION
, stdout
);
71 fputs (VERSION_OPTION_DESCRIPTION
, stdout
);
74 If a FILE is -, copy again to standard output.\n\
76 emit_ancillary_info ();
82 main (int argc
, char **argv
)
87 initialize_main (&argc
, &argv
);
88 set_program_name (argv
[0]);
89 setlocale (LC_ALL
, "");
90 bindtextdomain (PACKAGE
, LOCALEDIR
);
93 atexit (close_stdout
);
96 ignore_interrupts
= false;
98 while ((optc
= getopt_long (argc
, argv
, "ai", long_options
, NULL
)) != -1)
107 ignore_interrupts
= true;
110 case_GETOPT_HELP_CHAR
;
112 case_GETOPT_VERSION_CHAR (PROGRAM_NAME
, AUTHORS
);
115 usage (EXIT_FAILURE
);
119 if (ignore_interrupts
)
120 signal (SIGINT
, SIG_IGN
);
122 /* Do *not* warn if tee is given no file arguments.
123 POSIX requires that it work when given no arguments. */
125 ok
= tee_files (argc
- optind
, (const char **) &argv
[optind
]);
126 if (close (STDIN_FILENO
) != 0)
127 error (EXIT_FAILURE
, errno
, _("standard input"));
129 exit (ok
? EXIT_SUCCESS
: EXIT_FAILURE
);
132 /* Copy the standard input into each of the NFILES files in FILES
133 and into the standard output.
134 Return true if successful. */
137 tee_files (int nfiles
, const char **files
)
144 char const *mode_string
=
146 ? (append
? "ab" : "wb")
147 : (append
? "a" : "w"));
149 descriptors
= xnmalloc (nfiles
+ 1, sizeof *descriptors
);
151 /* Move all the names `up' one in the argv array to make room for
152 the entry for standard output. This writes into argv[argc]. */
153 for (i
= nfiles
; i
>= 1; i
--)
154 files
[i
] = files
[i
- 1];
156 if (O_BINARY
&& ! isatty (STDIN_FILENO
))
157 xfreopen (NULL
, "rb", stdin
);
158 if (O_BINARY
&& ! isatty (STDOUT_FILENO
))
159 xfreopen (NULL
, "wb", stdout
);
161 fadvise (stdin
, FADVISE_SEQUENTIAL
);
163 /* In the array of NFILES + 1 descriptors, make
164 the first one correspond to standard output. */
165 descriptors
[0] = stdout
;
166 files
[0] = _("standard output");
167 setvbuf (stdout
, NULL
, _IONBF
, 0);
169 for (i
= 1; i
<= nfiles
; i
++)
171 descriptors
[i
] = (STREQ (files
[i
], "-")
173 : fopen (files
[i
], mode_string
));
174 if (descriptors
[i
] == NULL
)
176 error (0, errno
, "%s", files
[i
]);
180 setvbuf (descriptors
[i
], NULL
, _IONBF
, 0);
185 bytes_read
= read (0, buffer
, sizeof buffer
);
186 if (bytes_read
< 0 && errno
== EINTR
)
191 /* Write to all NFILES + 1 descriptors.
192 Standard output is the first one. */
193 for (i
= 0; i
<= nfiles
; i
++)
195 && fwrite (buffer
, bytes_read
, 1, descriptors
[i
]) != 1)
197 error (0, errno
, "%s", files
[i
]);
198 descriptors
[i
] = NULL
;
203 if (bytes_read
== -1)
205 error (0, errno
, _("read error"));
209 /* Close the files, but not standard output. */
210 for (i
= 1; i
<= nfiles
; i
++)
211 if (!STREQ (files
[i
], "-")
212 && descriptors
[i
] && fclose (descriptors
[i
]) != 0)
214 error (0, errno
, "%s", files
[i
]);