| PATHCONF(2) | System Calls Manual | PATHCONF(2) | 
pathconf, fpathconf —
#include <unistd.h>
long
  
  pathconf(const
    char *path, int
    name);
long
  
  fpathconf(int
    fd, int name);
pathconf() and fpathconf()
  functions provide a method for applications to determine the current value of
  a configurable system limit or option variable associated with a pathname or
  file descriptor.
For pathconf, the
    path argument is the name of a file or directory. For
    fpathconf, the fd argument is
    an open file descriptor. The name argument specifies
    the system variable to be queried. Symbolic constants for each name value
    are found in the <unistd.h>
    header.
The available values are as follows:
_PC_LINK_MAX_PC_MAX_CANON_PC_MAX_INPUT_PC_NAME_MAX_PC_PATH_MAX_PC_PIPE_BUF_PC_CHOWN_RESTRICTED_PC_NO_TRUNCNAME_MAX} are
      silently truncated, or non-zero if an error is generated when
      {NAME_MAX} is exceeded._PC_VDISABLE_PC_SYNC_IO_PC_FILESIZEBITSmaxsize, then the returned value is 2 plus the
      floor of the base 2 logarithm of maxsize._PC_SYMLINK_MAX_PC_2_SYMLINKS{_PC_2_SYMLINKS} is undefined.pathconf or
  fpathconf is not successful, -1 is returned and
  errno is set appropriately. Otherwise, if the variable
  is associated with functionality that does not have a limit in the system, -1
  is returned and errno is not modified. Otherwise, the
  current variable value is returned.
pathconf
  and fpathconf functions shall return -1 and set
  errno to the corresponding value.
EINVAL]pathconf() will fail if:
EACCES]EIO]ELOOP]ENAMETOOLONG]NAME_MAX}
      characters, or an entire path name exceeded
      {PATH_MAX} characters.ENOENT]ENOTDIR]fpathconf() will fail if:
pathconf() and fpathconf()
  functions conform to IEEE Std 1003.1-1990
  (“POSIX.1”).
pathconf and fpathconf
  functions first appeared in 4.4BSD.
| July 26, 2010 | NetBSD 10.0 |