Check if 0, 1, 2 are valid tty file descriptors - ubase - suckless linux base utils
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       ---
 (DIR) commit 2d45a04b92df641158ca400873a522fede1d9a01
 (DIR) parent 6da76775cb54635ce07dfcd3894cdef3df8c692f
 (HTM) Author: sin <sin@2f30.org>
       Date:   Sun, 30 Nov 2014 13:04:47 +0000
       
       Check if 0, 1, 2 are valid tty file descriptors
       
       Diffstat:
         M login.c                             |       4 ++--
       
       1 file changed, 2 insertions(+), 2 deletions(-)
       ---
 (DIR) diff --git a/login.c b/login.c
       @@ -71,8 +71,8 @@ main(int argc, char *argv[])
                if (argc < 1)
                        usage();
        
       -        if (isatty(STDIN_FILENO) == 0)
       -                eprintf("stdin is not a tty\n");
       +        if (isatty(0) == 0 || isatty(1) == 0 || isatty(2) == 0)
       +                eprintf("no tty");
        
                user = argv[0];
                errno = 0;