lib/libc/sys-minix/fpathconf.c

   1 /* POSIX fpathconf (Sec. 5.7.1)                 Author: Andy Tanenbaum */
   2
   3 #include <sys/cdefs.h>
   4 #include "namespace.h"
   5 #include <lib.h>
   6
   7 #include <sys/stat.h>
   8 #include <errno.h>
   9 #include <limits.h>
  10 #include <unistd.h>
  11 #include <termios.h>
  12
  13 #ifdef __weak_alias
  14 __weak_alias(fpathconf, _fpathconf)
  15 #endif
  16
  17 long fpathconf(fd, name)
  18 int fd;                         /* file descriptor being interrogated */
  19 int name;                       /* property being inspected */
  20 {
  21 /* POSIX allows some of the values in <limits.h> to be increased at
  22  * run time.  The pathconf and fpathconf functions allow these values
  23  * to be checked at run time.  MINIX does not use this facility.
  24  * The run-time limits are those given in <limits.h>.
  25  */
  26
  27   struct stat stbuf;
  28
  29   switch(name) {
  30         case _PC_LINK_MAX:
  31                 /* Fstat the file.  If that fails, return -1. */
  32                 if (fstat(fd, &stbuf) != 0) return(-1);
  33                 if (S_ISDIR(stbuf.st_mode))
  34                         return(1L);     /* no links to directories */
  35                 else
  36                         return( (long) LINK_MAX);
  37
  38         case _PC_MAX_CANON:
  39                 return( (long) MAX_CANON);
  40
  41         case _PC_MAX_INPUT:
  42                 return( (long) MAX_INPUT);
  43
  44         case _PC_NAME_MAX:
  45                 return( (long) NAME_MAX);
  46
  47         case _PC_PATH_MAX:
  48                 return( (long) PATH_MAX);
  49
  50         case _PC_PIPE_BUF:
  51                 return( (long) PIPE_BUF);
  52
  53         case _PC_CHOWN_RESTRICTED:
  54                 return( (long) _POSIX_CHOWN_RESTRICTED);
  55
  56         case _PC_NO_TRUNC:
  57                 return( (long) _POSIX_NO_TRUNC);
  58
  59         case _PC_VDISABLE:
  60                 return( (long) _POSIX_VDISABLE);
  61
  62         default:
  63                 errno = EINVAL;
  64                 return(-1);
  65   }
  66 }