gfs_pio_open - open a file in the Gfarm file system

gfs_pio_open() opens a file in the Gfarm file system specified by gfarm_url, and returns a GFS_File
       structure to the address pointed by gfp.  gfarm_url is a path name in the Gfarm file system, or a Gfarm
       URL in the form of gfarm://metaserver:port/path/name.

       Values of flags are constructed by a bitwise-inclusive-OR of the following list. Exactly one of the first
       three values should be specified:

       GFARM_FILE_RDONLY
           Open for reading only.

       GFARM_FILE_WRONLY
           Open for writing only.

       GFARM_FILE_RDWR
           Open for reading and writing.

       GFARM_FILE_TRUNC
           If the file already exist and is a regular file, it will be truncated to length 0 if the open mode
           allows writing.

       GFARM_FILE_APPEND
           The file is opened in append mode.

       GFARM_FILE_UNBUFFERED
           The file is accessed without buffering.

       gfs_pio_open - open a file in the Gfarm file system

GFARM_ERR_NO_ERROR
           The function terminated successfully.

       GFARM_ERR_IS_A_DIRECTORYgfarm_url refers to a directory.

       GFARM_ERR_IS_A_SYMBOLIC_LINKgfarm_url refers to a symbolic link.

       GFARM_ERR_OPERATION_NOT_PERMITTEDgfarm_url refers to not a regular file.

       GFARM_ERR_NO_SUCH_OBJECT
           A component used as a directory in gfarm_url does not exist.

       GFARM_ERR_NOT_A_DIRECTORY
           A component used as a directory in gfarm_url is not, in fact, a directory.

       GFARM_ERR_PERMISSION_DENIED
           The requested access to the file is not allowed, or one of the directories in gfarm_url did not allow
           search (execute) permission. Or, the authentication to the metadata server fails.

       GFARM_ERR_NO_MEMORY
           Insufficient memory was available.

       GFARM_ERR_INVALID_ARGUMENTflags is not valid.

       GFARM_ERR_GFARM_URL_HOST_IS_MISSINGgfarm_url does not include a metadata server.

       GFARM_ERR_GFARM_URL_PORT_IS_MISSINGgfarm_url does not include a port number of the metadata server.

       GFARM_ERR_UNKNOWN_HOST
           The metadata server cannot be resolved.

       GFARM_ERR_TOO_MANY_OPEN_FILES
           The process opens too many files.

       GFARM_ERR_TOO_MANY_OPEN_FILES_IN_SYSTEM
           The system limit on the total number of open files has been reached.

       GFARM_ERR_NETWORK_IS_UNREACHABLE
           Network is unrechable.

       GFARM_ERR_OPERATION_TIMED_OUT
           Connetion timeout occurs.

       GFARM_ERR_PROTOCOL
           Protocol error occurs.

       GFARM_ERR_BROKEN_PIPE
           Connection to the metadata server is broken.

       GFARM_ERR_PROTOCOL_NOT_SUPPORTED
           Specified authentication protocol is not supported.

       GFARM_ERR_AUTHENTICATION
           User authentication failed when connecting to the metadata server.

       Others
           An error except the above occurred. The reason is shown by gfarm_error_string(3).

gfs_pio_close(3), gfs_pio_create(3), gfs_pio_eof(3), gfs_pio_error(3), gfs_pio_flush(3), gfs_pio_getc(3),
       gfs_pio_getline(3), gfs_pio_open(3), gfs_pio_putc(3), gfs_pio_putline(3), gfs_pio_puts(3),
       gfs_pio_read(3), gfs_pio_seek(3), gfs_pio_ungetc(3), gfs_pio_write(3)

Gfarm                                              8 Aug 2020                                    GFS_PIO_OPEN(3)

#include<gfarm/gfarm.h>gfarm_error_tgfs_pio_open(constchar*gfarm_url,intflags,GFS_File*gfp);