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NAME

       fpathconf, pathconf - get configuration values for files

SYNOPSIS

       #include <unistd.h>

       long fpathconf(int fd, int name);
       long pathconf(char *path, int name);

DESCRIPTION

       fpathconf()  gets  a  value for the configuration option name for the open file descriptor
       fd.

       pathconf() gets a value for configuration option name for the filename path.

       The corresponding macros defined in <unistd.h> are minimum values; if an application wants
       to  take  advantage of values which may change, a call to fpathconf() or pathconf() can be
       made, which may yield more liberal results.

       Setting name equal to one of the following constants returns the  following  configuration
       options:

       _PC_LINK_MAX
              returns  the  maximum  number  of  links  to  the  file.   If fd 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 fd 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 fd  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 fd that 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 fd  is  the  current
              working directory.  The corresponding macro is _POSIX_PATH_MAX.

       _PC_PIPE_BUF
              returns the size of the pipe buffer, where fd 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 fd  or  path
              refer  to  a  directory,  then  this  applies  to all files in that directory.  The
              corresponding macro is _POSIX_CHOWN_RESTRICTED.

       _PC_NO_TRUNC
              returns nonzero if accessing filenames longer  than  _POSIX_NAME_MAX  generates  an
              error.  The corresponding macro is _POSIX_NO_TRUNC.

       _PC_VDISABLE
              returns  nonzero  if special character processing can be disabled, where fd or path
              must refer to a terminal.

RETURN VALUE

       The limit is returned, if one exists.  If the  system  does  not  have  a  limit  for  the
       requested  resource,  -1 is returned, and errno is unchanged.  If there is an error, -1 is
       returned, and errno is set to reflect the nature of the error.

CONFORMING TO

       POSIX.1-2001.

NOTES

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

       Some returned values may be huge; they are not suitable for allocating memory.

SEE ALSO

       getconf(1), open(2), statfs(2), sysconf(3)

COLOPHON

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