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pathconf.0
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PATHCONF(2) UNIX Programmer's Manual PATHCONF(2)
NNAAMMEE
ppaatthhccoonnff, ffppaatthhccoonnff - get configurable pathname variables
SSYYNNOOPPSSIISS
##iinncclluuddee <<uunniissttdd..hh>>
_l_o_n_g
ppaatthhccoonnff(_c_o_n_s_t _c_h_a_r _*_p_a_t_h, _i_n_t _n_a_m_e)
_l_o_n_g
ffppaatthhccoonnff(_i_n_t _f_d, _i_n_t _n_a_m_e)
DDEESSCCRRIIPPTTIIOONN
The ppaatthhccoonnff() and ffppaatthhccoonnff() functions provides a method for applica-
tions to determine the current value of a configurable system limit or
option variable associated with a pathname or file descriptor.
For ppaatthhccoonnff, the _p_a_t_h argument is the name of a file or directory. For
ffppaatthhccoonnff, the _f_d argument is an open file descriptor. The _n_a_m_e argument
specifies the system variable to be queried. Symbolic constants for each
name value are found in the include file <unistd.h>.
The available values are as follows:
_PC_LINK_MAX
The maximum file link count.
_PC_MAX_CANON
The maximum number of bytes in terminal canonical input line.
_PC_MAX_INPUT
The minimum maximum number of bytes for which space is available
in a terminal input queue.
_PC_NAME_MAX
The maximum number of bytes in a file name.
_PC_PATH_MAX
The maximum number of bytes in a pathname.
_PC_PIPE_BUF
The maximum number of bytes which will be written atomically to a
pipe.
_PC_CHOWN_RESTRICTED
Return 1 if appropriate privileges are required for the chown(2)
system call, otherwise 0.
_PC_NO_TRUNC
Return 1 if file names longer than KERN_NAME_MAX are truncated.
_PC_VDISABLE
Returns the terminal character disabling value.
RREETTUURRNN VVAALLUUEESS
If the call to ppaatthhccoonnff or ffppaatthhccoonnff is not successful, -1 is returned
and _e_r_r_n_o is set appropriately. Otherwise, if the variable is associated
with functionality that does not have a limit in the system, -1 is re-
turned and _e_r_r_n_o is not modified. Otherwise, the current variable value
is returned.
EERRRROORRSS
If any of the following conditions occur, the ppaatthhccoonnff and ffppaatthhccoonnff
functions shall return -1 and set _e_r_r_n_o to the corresponding value.
[EINVAL] The value of the _n_a_m_e argument is invalid.
[EINVAL] The implementation does not support an association of the
variable name with the associated file.
PPaatthhccoonnff() will fail if:
[ENOTDIR] A component of the path prefix is not a directory.
[ENAMETOOLONG] A component of a pathname exceeded 255 characters, or an
entire path name exceeded 1023 characters.
[ENOENT] The named file does not exist.
[EACCES] Search permission is denied for a component of the path
prefix.
[ELOOP] Too many symbolic links were encountered in translating
the pathname.
[EIO] An I/O error occurred while reading from or writing to
the file system.
FFppaatthhccoonnff() will fail if:
[EBADF] _f_d is not a valid open file descriptor.
[EIO] An I/O error occurred while reading from or writing to the file
system.
SSEEEE AALLSSOO
sysctl(3)
HHIISSTTOORRYY
The ppaatthhccoonnff and ffppaatthhccoonnff functions first appeared in 4.4BSD.
4th Berkeley Distribution June 4, 1993 2