1 /* tee - read from standard input and write to standard output and files.
2 Copyright (C) 1985-2013 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
)
62 printf (_("Usage: %s [OPTION]... [FILE]...\n"), program_name
);
64 Copy standard input to each FILE, and also to standard output.\n\
66 -a, --append append to the given FILEs, do not overwrite\n\
67 -i, --ignore-interrupts ignore interrupt signals\n\
69 fputs (HELP_OPTION_DESCRIPTION
, stdout
);
70 fputs (VERSION_OPTION_DESCRIPTION
, stdout
);
73 If a FILE is -, copy again to standard output.\n\
75 emit_ancillary_info ();
81 main (int argc
, char **argv
)
86 initialize_main (&argc
, &argv
);
87 set_program_name (argv
[0]);
88 setlocale (LC_ALL
, "");
89 bindtextdomain (PACKAGE
, LOCALEDIR
);
92 atexit (close_stdout
);
95 ignore_interrupts
= false;
97 while ((optc
= getopt_long (argc
, argv
, "ai", long_options
, NULL
)) != -1)
106 ignore_interrupts
= true;
109 case_GETOPT_HELP_CHAR
;
111 case_GETOPT_VERSION_CHAR (PROGRAM_NAME
, AUTHORS
);
114 usage (EXIT_FAILURE
);
118 if (ignore_interrupts
)
119 signal (SIGINT
, SIG_IGN
);
121 /* Do *not* warn if tee is given no file arguments.
122 POSIX requires that it work when given no arguments. */
124 ok
= tee_files (argc
- optind
, (const char **) &argv
[optind
]);
125 if (close (STDIN_FILENO
) != 0)
126 error (EXIT_FAILURE
, errno
, _("standard input"));
128 exit (ok
? EXIT_SUCCESS
: EXIT_FAILURE
);
131 /* Copy the standard input into each of the NFILES files in FILES
132 and into the standard output.
133 Return true if successful. */
136 tee_files (int nfiles
, const char **files
)
143 char const *mode_string
=
145 ? (append
? "ab" : "wb")
146 : (append
? "a" : "w"));
148 descriptors
= xnmalloc (nfiles
+ 1, sizeof *descriptors
);
150 /* Move all the names 'up' one in the argv array to make room for
151 the entry for standard output. This writes into argv[argc]. */
152 for (i
= nfiles
; i
>= 1; i
--)
153 files
[i
] = files
[i
- 1];
155 if (O_BINARY
&& ! isatty (STDIN_FILENO
))
156 xfreopen (NULL
, "rb", stdin
);
157 if (O_BINARY
&& ! isatty (STDOUT_FILENO
))
158 xfreopen (NULL
, "wb", stdout
);
160 fadvise (stdin
, FADVISE_SEQUENTIAL
);
162 /* In the array of NFILES + 1 descriptors, make
163 the first one correspond to standard output. */
164 descriptors
[0] = stdout
;
165 files
[0] = _("standard output");
166 setvbuf (stdout
, NULL
, _IONBF
, 0);
168 for (i
= 1; i
<= nfiles
; i
++)
170 descriptors
[i
] = (STREQ (files
[i
], "-")
172 : fopen (files
[i
], mode_string
));
173 if (descriptors
[i
] == NULL
)
175 error (0, errno
, "%s", files
[i
]);
179 setvbuf (descriptors
[i
], NULL
, _IONBF
, 0);
184 bytes_read
= read (0, buffer
, sizeof buffer
);
185 if (bytes_read
< 0 && errno
== EINTR
)
190 /* Write to all NFILES + 1 descriptors.
191 Standard output is the first one. */
192 for (i
= 0; i
<= nfiles
; i
++)
194 && fwrite (buffer
, bytes_read
, 1, descriptors
[i
]) != 1)
196 error (0, errno
, "%s", files
[i
]);
197 descriptors
[i
] = NULL
;
202 if (bytes_read
== -1)
204 error (0, errno
, _("read error"));
208 /* Close the files, but not standard output. */
209 for (i
= 1; i
<= nfiles
; i
++)
210 if (!STREQ (files
[i
], "-")
211 && descriptors
[i
] && fclose (descriptors
[i
]) != 0)
213 error (0, errno
, "%s", files
[i
]);