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32 .\" @(#)pathconf.2 8.1 (Berkeley) 6/4/93
41 .Nd get configurable pathname variables
45 .Fd #include <unistd.h>
47 .Fn pathconf "const char *path" "int name"
49 .Fn fpathconf "int fd" "int name"
56 functions provides a method for applications to determine the current
57 value of a configurable system limit or option variable associated
58 with a pathname or file descriptor.
64 argument is the name of a file or directory.
69 argument is an open file descriptor.
72 argument specifies the system variable to be queried.
73 Symbolic constants for each name value are found in the include file
76 The available values are as follows:
78 .Bl -tag -width "123456"
81 The maximum file link count.
83 The maximum number of bytes in terminal canonical input line.
85 The minimum maximum number of bytes for which space is available in
86 a terminal input queue.
88 The maximum number of bytes in a file name.
90 The maximum number of bytes in a pathname.
92 The maximum number of bytes which will be written atomically to a pipe.
93 .It Li _PC_CHOWN_RESTRICTED
94 Return 1 if appropriate privileges are required for the
96 system call, otherwise 0.
98 Return 1 if file names longer than KERN_NAME_MAX are truncated.
100 Returns the terminal character disabling value.
107 is not successful, \-1 is returned and
109 is set appropriately.
110 Otherwise, if the variable is associated with functionality that does
111 not have a limit in the system, \-1 is returned and
114 Otherwise, the current variable value is returned.
116 If any of the following conditions occur, the
120 functions shall return -1 and set
122 to the corresponding value.
129 The implementation does not support an association of the variable
130 name with the associated file.
137 A component of the path prefix is not a directory.
138 .It Bq Er ENAMETOOLONG
139 A component of a pathname exceeded 255 characters,
140 or an entire path name exceeded 1023 characters.
142 The named file does not exist.
144 Search permission is denied for a component of the path prefix.
146 Too many symbolic links were encountered in translating the pathname.
148 An I/O error occurred while reading from or writing to the file system.
156 is not a valid open file descriptor.
158 An I/O error occurred while reading from or writing to the file system.
167 functions first appeared in