fpathconf, pathconf - get configuration values for files
#include <unistd.h>
long fpathconf(int filedes, int name);
long pathconf(char *path, int name);
fpathconf() gets a value for the configuration option name for the open
file descriptor filedes.
pathconf() gets a value for configuration option name for the file name
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 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.
_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 filedes or path must refer to a terminal.
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.
POSIX.1
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.
getconf(1), statfs(2), open(2), sysconf(3)
GNU 1993-04-04 FPATHCONF(3)
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