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/* tee - read from standard input and write to standard output and files.
Copyright (C) 1985-2015 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
/* Mike Parker, Richard M. Stallman, and David MacKenzie */
#include <config.h>
#include <sys/types.h>
#include <signal.h>
#include <getopt.h>
#include "system.h"
#include "argmatch.h"
#include "error.h"
#include "fadvise.h"
#include "quote.h"
#include "stdio--.h"
#include "xfreopen.h"
/* The official name of this program (e.g., no 'g' prefix). */
#define PROGRAM_NAME "tee"
#define AUTHORS \
proper_name ("Mike Parker"), \
proper_name ("Richard M. Stallman"), \
proper_name ("David MacKenzie")
static bool tee_files (int nfiles, char **files);
/* If true, append to output files rather than truncating them. */
static bool append;
/* If true, ignore interrupts. */
static bool ignore_interrupts;
enum output_error
{
output_error_sigpipe, /* traditional behavior, sigpipe enabled. */
output_error_warn, /* warn on EPIPE, but continue. */
output_error_warn_nopipe, /* ignore EPIPE, continue. */
output_error_exit, /* exit on any output error. */
output_error_exit_nopipe /* exit on any output error except EPIPE. */
};
static enum output_error output_error;
static struct option const long_options[] =
{
{"append", no_argument, NULL, 'a'},
{"ignore-interrupts", no_argument, NULL, 'i'},
{"output-error", optional_argument, NULL, 'p'},
{GETOPT_HELP_OPTION_DECL},
{GETOPT_VERSION_OPTION_DECL},
{NULL, 0, NULL, 0}
};
static char const *const output_error_args[] =
{
"warn", "warn-nopipe", "exit", "exit-nopipe", NULL
};
static enum output_error const output_error_types[] =
{
output_error_warn, output_error_warn_nopipe,
output_error_exit, output_error_exit_nopipe
};
ARGMATCH_VERIFY (output_error_args, output_error_types);
void
usage (int status)
{
if (status != EXIT_SUCCESS)
emit_try_help ();
else
{
printf (_("Usage: %s [OPTION]... [FILE]...\n"), program_name);
fputs (_("\
Copy standard input to each FILE, and also to standard output.\n\
\n\
-a, --append append to the given FILEs, do not overwrite\n\
-i, --ignore-interrupts ignore interrupt signals\n\
"), stdout);
fputs (_("\
-p diagnose errors writing to non pipes\n\
--output-error[=MODE] set behavior on write error. See MODE below\n\
"), stdout);
fputs (HELP_OPTION_DESCRIPTION, stdout);
fputs (VERSION_OPTION_DESCRIPTION, stdout);
fputs (_("\
\n\
MODE determines behavior with write errors on the outputs:\n\
'warn' diagnose errors writing to any output\n\
'warn-nopipe' diagnose errors writing to any output not a pipe\n\
'exit' exit on error writing to any output\n\
'exit-nopipe' exit on error writing to any output not a pipe\n\
The default MODE for the -p option is 'warn-nopipe'.\n\
The default operation when --output-error is not specified, is to\n\
exit immediately on error writing to a pipe, and diagnose errors\n\
writing to non pipe outputs.\n\
"), stdout);
emit_ancillary_info (PROGRAM_NAME);
}
exit (status);
}
int
main (int argc, char **argv)
{
bool ok;
int optc;
initialize_main (&argc, &argv);
set_program_name (argv[0]);
setlocale (LC_ALL, "");
bindtextdomain (PACKAGE, LOCALEDIR);
textdomain (PACKAGE);
atexit (close_stdout);
append = false;
ignore_interrupts = false;
while ((optc = getopt_long (argc, argv, "aip", long_options, NULL)) != -1)
{
switch (optc)
{
case 'a':
append = true;
break;
case 'i':
ignore_interrupts = true;
break;
case 'p':
if (optarg)
output_error = XARGMATCH ("--output-error", optarg,
output_error_args, output_error_types);
else
output_error = output_error_warn_nopipe;
break;
case_GETOPT_HELP_CHAR;
case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);
default:
usage (EXIT_FAILURE);
}
}
if (ignore_interrupts)
signal (SIGINT, SIG_IGN);
if (output_error != output_error_sigpipe)
signal (SIGPIPE, SIG_IGN);
/* Do *not* warn if tee is given no file arguments.
POSIX requires that it work when given no arguments. */
ok = tee_files (argc - optind, &argv[optind]);
if (close (STDIN_FILENO) != 0)
error (EXIT_FAILURE, errno, "%s", _("standard input"));
return ok ? EXIT_SUCCESS : EXIT_FAILURE;
}
/* Copy the standard input into each of the NFILES files in FILES
and into the standard output. As a side effect, modify FILES[-1].
Return true if successful. */
static bool
tee_files (int nfiles, char **files)
{
size_t n_outputs = 0;
FILE **descriptors;
char buffer[BUFSIZ];
ssize_t bytes_read = 0;
int i;
bool ok = true;
char const *mode_string =
(O_BINARY
? (append ? "ab" : "wb")
: (append ? "a" : "w"));
if (O_BINARY && ! isatty (STDIN_FILENO))
xfreopen (NULL, "rb", stdin);
if (O_BINARY && ! isatty (STDOUT_FILENO))
xfreopen (NULL, "wb", stdout);
fadvise (stdin, FADVISE_SEQUENTIAL);
/* Set up FILES[0 .. NFILES] and DESCRIPTORS[0 .. NFILES].
In both arrays, entry 0 corresponds to standard output. */
descriptors = xnmalloc (nfiles + 1, sizeof *descriptors);
files--;
descriptors[0] = stdout;
files[0] = bad_cast (_("standard output"));
setvbuf (stdout, NULL, _IONBF, 0);
n_outputs++;
for (i = 1; i <= nfiles; i++)
{
/* Do not treat "-" specially - as mandated by POSIX. */
descriptors[i] = fopen (files[i], mode_string);
if (descriptors[i] == NULL)
{
error (output_error == output_error_exit
|| output_error == output_error_exit_nopipe,
errno, "%s", quote (files[i]));
ok = false;
}
else
{
setvbuf (descriptors[i], NULL, _IONBF, 0);
n_outputs++;
}
}
while (n_outputs)
{
bytes_read = read (0, buffer, sizeof buffer);
if (bytes_read < 0 && errno == EINTR)
continue;
if (bytes_read <= 0)
break;
/* Write to all NFILES + 1 descriptors.
Standard output is the first one. */
for (i = 0; i <= nfiles; i++)
if (descriptors[i]
&& fwrite (buffer, bytes_read, 1, descriptors[i]) != 1)
{
int w_errno = errno;
bool fail = errno != EPIPE || (output_error == output_error_exit
|| output_error == output_error_warn);
if (descriptors[i] == stdout)
clearerr (stdout); /* Avoid redundant close_stdout diagnostic. */
if (fail)
{
error (output_error == output_error_exit
|| output_error == output_error_exit_nopipe,
w_errno, "%s", quote (files[i]));
}
descriptors[i] = NULL;
if (fail)
ok = false;
n_outputs--;
}
}
if (bytes_read == -1)
{
error (0, errno, _("read error"));
ok = false;
}
/* Close the files, but not standard output. */
for (i = 1; i <= nfiles; i++)
if (descriptors[i] && fclose (descriptors[i]) != 0)
{
error (0, errno, "%s", quote (files[i]));
ok = false;
}
free (descriptors);
return ok;
}
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