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    revision 983 by niro, Fri Apr 24 18:33:46 2009 UTC revision 984 by niro, Sun May 30 11:32:42 2010 UTC
    # Line 7  Line 7 
    7   * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.   * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
    8   */   */
    9    
    10  /* BB_AUDIT SUSv3 compliant */  /* BB_AUDIT SUSv4 compliant */
    11  /* http://www.opengroup.org/onlinepubs/007904975/utilities/tty.html */  /* http://www.opengroup.org/onlinepubs/9699919799/utilities/tty.html */
    12    
    13  #include "libbb.h"  #include "libbb.h"
    14    
    15  int tty_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;  int tty_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
    16  int tty_main(int argc, char **argv SKIP_INCLUDE_SUSv2(UNUSED_PARAM))  int tty_main(int argc UNUSED_PARAM, char **argv)
    17  {  {
    18   const char *s;   const char *s;
    19   USE_INCLUDE_SUSv2(int silent;) /* Note: No longer relevant in SUSv3. */   IF_INCLUDE_SUSv2(int silent;) /* Note: No longer relevant in SUSv3. */
    20   int retval;   int retval;
    21    
    22   xfunc_error_retval = 2; /* SUSv3 requires > 1 for error. */   xfunc_error_retval = 2; /* SUSv3 requires > 1 for error. */
    23    
    24   USE_INCLUDE_SUSv2(silent = getopt32(argv, "s");)   IF_INCLUDE_SUSv2(silent = getopt32(argv, "s");)
    25   USE_INCLUDE_SUSv2(argc -= optind;)   IF_INCLUDE_SUSv2(argv += optind;)
    26   SKIP_INCLUDE_SUSv2(argc -= 1;)   IF_NOT_INCLUDE_SUSv2(argv += 1;)
    27    
    28   /* gnu tty outputs a warning that it is ignoring all args. */   /* gnu tty outputs a warning that it is ignoring all args. */
    29   bb_warn_ignoring_args(argc);   bb_warn_ignoring_args(argv[0]);
    30    
    31   retval = 0;   retval = EXIT_SUCCESS;
    32    
    33   s = ttyname(0);   s = xmalloc_ttyname(STDIN_FILENO);
    34   if (s == NULL) {   if (s == NULL) {
    35   /* According to SUSv3, ttyname can fail with EBADF or ENOTTY.   /* According to SUSv3, ttyname can fail with EBADF or ENOTTY.
    36   * We know the file descriptor is good, so failure means not a tty. */   * We know the file descriptor is good, so failure means not a tty. */
    37   s = "not a tty";   s = "not a tty";
    38   retval = 1;   retval = EXIT_FAILURE;
    39   }   }
    40   USE_INCLUDE_SUSv2(if (!silent) puts(s);)   IF_INCLUDE_SUSv2(if (!silent) puts(s);)
    41   SKIP_INCLUDE_SUSv2(puts(s);)   IF_NOT_INCLUDE_SUSv2(puts(s);)
    42    
    43   fflush_stdout_and_exit(retval);   fflush_stdout_and_exit(retval);
    44  }  }
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