3 Sep 2015
gfs_pio_create 3 Gfarm
gfs_pio_create create a file in the Gfarm file system

    #include <gfarm/gfarm.h>

`gfarm_error_t gfs_pio_create` const char * gfarm_url int flags gfarm_mode_t mode GFS_File * gfp

## DESCRIPTION

`gfs_pio_create()` creates a new file in the Gfarm file system whose name is the string pointed to by gfarm_url with the access mode mode, and returns a GFS_File structure to the address pointed to by gfp. Mode specifies the file permissions to be created, and is modified by the process's `umask`.

The flags argument has the same meaning as the second argument of `gfs_pio_open()`, including the point such that exactly one of GFARM_FILE_RDONLY, GFARM_FILE_WRONLY, and GFARM_FILE_RDWR should be specified. In addition, it is possible to specify GFARM_FILE_EXCLUSIVE. With this flag, `gfs_pio_create()` will fail when the file already exists.

Note that GFARM_FILE_TRUNC must be explicitly specified by the flags argument if needed.

## RETURN VALUES

`GFARM_ERR_NO_ERROR`

  The function terminated successfully.

`GFARM_ERR_IS_A_DIRECTORY`

  gfarm_url refers to a directory.

`GFARM_ERR_IS_A_SYMBOLIC_LINK`

  gfarm_url refers to a symbolic link.

`GFARM_ERR_OPERATION_NOT_PERMITTED`

  gfarm_url refers to not a regular file.

`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 file did not exist yet and write access to the parent directory is not allowed. Or, the authentication to the metadata server fails.

`GFARM_ERR_NO_MEMORY`

  Insufficient memory was available.

`GFARM_ERR_INVALID_ARGUMENT`

  flags is not valid.

`GFARM_ERR_GFARM_URL_HOST_IS_MISSING`

  gfarm_url does not include a metadata server.

`GFARM_ERR_GFARM_URL_PORT_IS_MISSING`

  gfarm_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.

`GFARM_ERR_ALREADY_EXISTS`

  gfarm_url already exists and GFARM_FILE_EXCLUSIVE was used.

Others

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

## SEE ALSO

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