Manpage of FPATHCONF
FPATHCONFSection: Linux Programmer's Manual (3)
NAMEfpathconf, pathconf - get configuration values for files
#include <unistd.h>long fpathconf(int fd, int name);
long pathconf(const char *path, int name);
DESCRIPTIONfpathconf() gets a value for the configuration option namefor the open file descriptor fd.
pathconf() gets a value for configuration option namefor 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 nameequal to one of the following constants returns the following configuration options:
- returns the maximum number of links to the file. If fdor pathrefer to a directory, then the value applies to the whole directory. The corresponding macro is _POSIX_LINK_MAX.
- returns the maximum length of a formatted input line, where fdor pathmust refer to a terminal. The corresponding macro is _POSIX_MAX_CANON.
- returns the maximum length of an input line, where fdor pathmust refer to a terminal. The corresponding macro is _POSIX_MAX_INPUT.
- returns the maximum length of a filename in the directory pathor fdthat the process is allowed to create. The corresponding macro is _POSIX_NAME_MAX.
- returns the maximum length of a relative pathname when pathor fdis the current working directory. The corresponding macro is _POSIX_PATH_MAX.
- returns the size of the pipe buffer, where fdmust refer to a pipe or FIFO and pathmust refer to a FIFO. The corresponding macro is _POSIX_PIPE_BUF.
- returns nonzero if the chown(2) call may not be used on this file. If fdor pathrefer to a directory, then this applies to all files in that directory. The corresponding macro is _POSIX_CHOWN_RESTRICTED.
- returns nonzero if accessing filenames longer than _POSIX_NAME_MAXgenerates an error. The corresponding macro is _POSIX_NO_TRUNC.
- returns nonzero if special character processing can be disabled, where fdor pathmust refer to a terminal.
RETURN VALUEThe limit is returned, if one exists. If the system does not have a limit for the requested resource, -1 is returned, and errnois unchanged. If there is an error, -1 is returned, and errnois set to reflect the nature of the error.
ATTRIBUTESFor an explanation of the terms used in this section, see attributes(7).
|fpathconf(), pathconf()||Thread safety||MT-Safe|
CONFORMING TOPOSIX.1-2001, POSIX.1-2008.
NOTESFiles with name lengths longer than the value returned for nameequal to _PC_NAME_MAXmay exist in the given directory.
SEE ALSOgetconf(1), open(2), statfs(2), confstr(3), sysconf(3)
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