RTEMS 4.9.1 On-Line Library

Files and Directories Manager pathconf - Gets configuration values for files

RTEMS POSIX API User's Guide

#include <unistd.h>

int pathconf(
  const char *path,
  int         name
);

EINVAL: Invalid argument
EACCES: Permission to write the file is denied
ENAMETOOLONG: Length of a filename string exceeds PATH_MAX and _POSIX_NO_TRUNC is in effect.
ENOENT: A file or directory does not exist
ENOTDIR: A component of the specified path was not a directory whan a directory was expected.

pathconf() gets a value for the configuration option name for the open file descriptor filedes.

The possible values for name are:

_PC_LINK_MAX: returns the maximum number of links to the file. If filedes or path refer to a directory, then the value applies to the whole directory. The corresponding macro is _POSIX_LINK_MAX.
_PC_MAX_CANON: returns the maximum length of a formatted input line, where filedes or path must refer to a terminal. The corresponding macro is _POSIX_MAX_CANON.
_PC_MAX_INPUT: returns the maximum length of an input line, where filedes or path must refer to a terminal. The corresponding macro is _POSIX_MAX_INPUT.
_PC_NAME_MAX: returns the maximum length of a filename in the directory path or filedes. The process is allowed to create. The corresponding macro is _POSIX_NAME_MAX.
_PC_PATH_MAX: returns the maximum length of a relative pathname when path or filedes is the current working directory. The corresponding macro is _POSIX_PATH_MAX.
_PC_PIPE_BUF: returns the size of the pipe buffer, where filedes must refer to a pipe or FIFO and path must refer to a FIFO. The corresponding macro is _POSIX_PIPE_BUF.
_PC_CHOWN_RESTRICTED: returns nonzero if the chown(2) call may not be used on this file. If filedes or path refer to a directory, then this applies to all files in that directory. The corresponding macro is _POSIX_CHOWN_RESTRICTED.

Files with name lengths longer than the value returned for name equal _PC_NAME_MAX may exist in the given directory.

RTEMS POSIX API User's Guide