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1、 C+函数fpathconf()函数Section: Linux Programmer”s Manual (3 )Updated: 19930404NAMEfpathconf, pathconf get configuration values for filesSYNOPSIS#includelong fpathconf(int filedes, int name);long pathconf(char *path, int name);DESCRIPTIONfpathconf() gets a value for the configuration option name for the
2、open file descriptor filedes.pathconf() gets a value for configuration option name for the file name path.The corresponding macros defined in 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 mor
3、e liberal results.Setting name equal to one of the following constants returns the following configuration options:_PC_LINK_MAXreturns 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_LI
4、NK_MAX._PC_MAX_CANONreturns 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_INPUTreturns the maximum length of an input line, where filedes or path must refer to a terminal. The corresponding macro is _
5、POSIX_MAX_INPUT._PC_NAME_MAXreturns 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_MAXreturns the maximum length of a relative pathname when path or filedes is the current working directory. The
6、 corresponding macro is _POSIX_PATH_MAX._PC_PIPE_BUFreturns 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_RESTRICTEDreturns nonzero if the chown(2) call may not be used on this file. If file
7、des or path refer to a directory, then this applies to all files in that directory. The corresponding macro is _POSIX_CHOWN_RESTRICTED./http:/_PC_NO_TRUNCreturns nonzero if accessing filenames longer than _POSIX_NAME_MAX generates an error. The corresponding macro is _POSIX_NO_TRUNC._PC_VDISABLEretu
8、rns nonzero if special character processing can be disabled, where filedes or path must 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 errno is unchanged. If there is an error, 1 is returned, an
9、d errno is set to reflect the nature of the error.CONFORMING TOPOSIX.1NOTESFiles 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 ALSOgetconf(1), open(2), statfs(2), sysconf(3)
