minix3/lib/libc/sys/fpathconf.c

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2020-02-21 00:59:27 +05:30
/* POSIX fpathconf (Sec. 5.7.1) Author: Andy Tanenbaum */
#include <sys/cdefs.h>
#include "namespace.h"
#include <lib.h>
#include <sys/stat.h>
#include <errno.h>
#include <limits.h>
#include <unistd.h>
#include <termios.h>
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);
}
}