source: trunk/minix/lib/posix/_fpathconf.c@ 15

/* POSIX fpathconf (Sec. 5.7.1)                 Author: Andy Tanenbaum */

#include <lib.h>
#define fstat           _fstat
#define fpathconf       _fpathconf
#include <sys/stat.h>
#include <errno.h>
#include <limits.h>
#include <unistd.h>
#include <termios.h>

PUBLIC long fpathconf(fd, name)
int fd;                         /* file descriptor being interrogated */
int name;                       /* property being inspected */
{
/* POSIX allows some of the values in <limits.h> to be increased at
 * run time.  The pathconf and fpathconf functions allow these values
 * to be checked at run time.  MINIX does not use this facility.
 * The run-time limits are those given in <limits.h>.
 */

  struct stat stbuf;

  switch(name) {
        case _PC_LINK_MAX:
                /* Fstat the file.  If that fails, return -1. */
                if (fstat(fd, &stbuf) != 0) return(-1);
                if (S_ISDIR(stbuf.st_mode))
                        return(1L);     /* no links to directories */
                else
                        return( (long) LINK_MAX);

        case _PC_MAX_CANON:
                return( (long) MAX_CANON);

        case _PC_MAX_INPUT:
                return( (long) MAX_INPUT);

        case _PC_NAME_MAX:
                return( (long) NAME_MAX);

        case _PC_PATH_MAX:
                return( (long) PATH_MAX);

        case _PC_PIPE_BUF:
                return( (long) PIPE_BUF);

        case _PC_CHOWN_RESTRICTED:
                return( (long) _POSIX_CHOWN_RESTRICTED);

        case _PC_NO_TRUNC:
                return( (long) _POSIX_NO_TRUNC);

        case _PC_VDISABLE:
                return( (long) _POSIX_VDISABLE);

        default:
                errno = EINVAL;
                return(-1);
  }
}