View Source ssh_sftp (ssh v5.2)

SFTP client.

This module implements an SSH FTP (SFTP) client. SFTP is a secure, encrypted file transfer service available for SSH.

Summary

Types: Error cause

A description of the reason why an operation failed.

Types: Crypto operations for open_tar

The initial crypto_state/0 returned from the init_fun/0 is folded into repeated applications of the crypto_fun/0 in the tar_crypto_spec. The binary returned from that fun is sent to the remote SFTP server and the new crypto_state/0 is used in the next call of the crypto_fun/0.

The init_fun/0 in the tar_crypto_spec is applied once prior to any other crypto operation. The intention is that this function initiates the encryption or decryption for example by calling crypto:crypto_init/4 or similar. The crypto_state/0 is the state such a function may return.

Specifies the encryption or decryption applied to tar files when using open_tar/3 or open_tar/4.

If doing encryption, the final_fun/0 in the tar_crypto_spec is applied to the last piece of data. The final_fun/0 is responsible for padding (if needed) and encryption of that last piece.

Functions

The apread/4 function reads from a specified position, combining the position/3 and aread/3 functions.

The apwrite/4 function writes to a specified position, combining the position/3 and awrite/3 functions.

Reads from an open file, without waiting for the result. If the handle is valid, the function returns {async, N}, where N is a term guaranteed to be unique between calls of aread. The actual data is sent as a message to the calling process. This message has the form {async_reply, N, Result}, where Result is the result from the read, either {ok, Data}, eof, or {error, reason()}.

Writes to an open file, without waiting for the result. If the handle is valid, the function returns {async, N}, where N is a term guaranteed to be unique between calls of awrite. The result of the write operation is sent as a message to the calling process. This message has the form {async_reply, N, Result}, where Result is the result from the write, either ok, or {error, reason()}.

Closes a handle to an open file or directory on the server.

Deletes a directory specified by Name. The directory must be empty before it can be successfully deleted.

Deletes the file specified by Name.

Lists the given directory on the server, returning the filenames as a list of strings.

Creates a directory specified by Name. Name must be a full path to a new directory. The directory can only be created in an existing directory.

Creates a symbolic link pointing to Target with the name Name.

Opens a file on the server and returns a handle, which can be used for reading or writing.

Opens a handle to a tar file on the server, associated with ChannelPid. The handle can be used for remote tar creation and extraction. The actual writing and reading is performed by calls to erl_tar:add/3,4 and erl_tar:extract/2. Note: The erl_tar:init/3 function should not be called, that one is called by this open_tar function.

Opens a handle to a directory on the server. The handle can be used for reading directory contents.

Sets the file position of the file referenced by Handle. Returns {ok, NewPosition} (as an absolute offset) if successful, otherwise {error, reason()}. Location is one of the following

The pread/3,4 function reads from a specified position, combining the position/3 and read/3,4 functions.

The pwrite/3,4 function writes to a specified position, combining the position/3 and write/3,4 functions.

Reads Len bytes from the file referenced by Handle. Returns {ok, Data}, eof, or {error, reason()}. If the file is opened with binary, Data is a binary, otherwise it is a string.

Reads a file from the server, and returns the data in a binary.

Returns a file_info record from the file system object specified by Name or Handle. See file:read_file_info/2 for information about the record.

Reads the link target from the symbolic link specified by name.

Returns a file_info record from the symbolic link specified by Name or Handle. See file:read_link_info/2 for information about the record.

Renames a file named OldName and gives it the name NewName.

start_channel(Host, Port, Options) ->

Stops an SFTP channel. Does not close the SSH connection. Use ssh:close/1 to close it.

Writes data to the file referenced by Handle. The file is to be opened with write or append flag. Returns ok if successful or {error, reason()} otherwise.

Writes a file to the server. The file is created if it does not exist but overwritten if it exists.

Writes file information from a file_info record to the file specified by Name. See file:write_file_info/2,3 for information about the record.

Types: Error cause

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reason()

View Source (not exported)
-type reason() :: atom() | string() | tuple().

A description of the reason why an operation failed.

The atom/0 value is formed from the sftp error codes in the protocol-level responses as defined in draft-ietf-secsh-filexfer-13 section 9.1. The codes are named as SSH_FX_* which are transformed into lowercase of the star-part. E.g. the error code SSH_FX_NO_SUCH_FILE will cause the reason/0 to be no_such_file.

The string/0 reason is the error information from the server in case of an exit-signal. If that information is empty, the reason is the exit signal name.

The tuple/0 reason are other errors like for example {exit_status,1}.

Types: Crypto operations for open_tar

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chunk_size()

View Source (not exported)
-type chunk_size() :: undefined | pos_integer().
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crypto_fun()

View Source (not exported)
-type crypto_fun() :: fun((TextIn :: binary(), crypto_state()) -> crypto_result()).
Link to this type

crypto_result()

View Source (not exported)
-type crypto_result() ::
    {ok, TextOut :: binary(), crypto_state()} |
    {ok, TextOut :: binary(), crypto_state(), chunk_size()}.

The initial crypto_state/0 returned from the init_fun/0 is folded into repeated applications of the crypto_fun/0 in the tar_crypto_spec. The binary returned from that fun is sent to the remote SFTP server and the new crypto_state/0 is used in the next call of the crypto_fun/0.

If the crypto_fun/0 reurns a chunk_size/0, that value is as block size for further blocks in calls to crypto_fun/0.

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crypto_state()

View Source (not exported)
-type crypto_state() :: any().

The init_fun/0 in the tar_crypto_spec is applied once prior to any other crypto operation. The intention is that this function initiates the encryption or decryption for example by calling crypto:crypto_init/4 or similar. The crypto_state/0 is the state such a function may return.

If the selected cipher needs to have the input data partitioned into blocks of a certain size, the init_fun/0 should return the second form of return value with the chunk_size/0 set to the block size. If the chunk_size/0 is undefined, the size of the PlainBins varies, because this is intended for stream crypto, whereas a fixed chunk_size/0 is intended for block crypto. A chunk_size/0 can be changed in the return from the crypto_fun/0. The value can be changed between pos_integer/0 and undefined.

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decrypt_spec()

View Source (not exported)
-type decrypt_spec() :: {init_fun(), crypto_fun()}.

Specifies the encryption or decryption applied to tar files when using open_tar/3 or open_tar/4.

The encryption or decryption is applied to the generated stream of bytes prior to sending the resulting stream to the SFTP server.

For code examples see Section Example with encryption in the ssh Users Guide.

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encrypt_spec()

View Source (not exported)
-type encrypt_spec() :: {init_fun(), crypto_fun(), final_fun()}.
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final_fun()

View Source (not exported)
-type final_fun() :: fun((FinalTextIn :: binary(), crypto_state()) -> {ok, FinalTextOut :: binary()}).

If doing encryption, the final_fun/0 in the tar_crypto_spec is applied to the last piece of data. The final_fun/0 is responsible for padding (if needed) and encryption of that last piece.

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init_fun()

View Source (not exported)
-type init_fun() :: fun(() -> {ok, crypto_state()}) | fun(() -> {ok, crypto_state(), chunk_size()}).
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tar_crypto_spec()

View Source (not exported)
-type tar_crypto_spec() :: encrypt_spec() | decrypt_spec().

Types

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sftp_option()

View Source (not exported)
-type sftp_option() ::
    {timeout, timeout()} |
    {sftp_vsn, pos_integer()} |
    {window_size, pos_integer()} |
    {packet_size, pos_integer()}.

Functions

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apread(ChannelPid, Handle, Position, Len)

View Source
-spec apread(ChannelPid, Handle, Position, Len) -> {async, N} | Error
          when
              ChannelPid :: pid(),
              Handle :: term(),
              Position :: integer(),
              Len :: integer(),
              Error :: {error, reason()},
              N :: term().

The apread/4 function reads from a specified position, combining the position/3 and aread/3 functions.

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apwrite(ChannelPid, Handle, Position, Data)

View Source
-spec apwrite(ChannelPid, Handle, Position, Data) -> {async, N} | Error
           when
               ChannelPid :: pid(),
               Handle :: term(),
               Position :: integer(),
               Data :: binary(),
               Error :: {error, reason()},
               N :: term().

The apwrite/4 function writes to a specified position, combining the position/3 and awrite/3 functions.

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aread(ChannelPid, Handle, Len)

View Source
-spec aread(ChannelPid, Handle, Len) -> {async, N} | Error
         when
             ChannelPid :: pid(),
             Handle :: term(),
             Len :: integer(),
             Error :: {error, reason()},
             N :: term().

Reads from an open file, without waiting for the result. If the handle is valid, the function returns {async, N}, where N is a term guaranteed to be unique between calls of aread. The actual data is sent as a message to the calling process. This message has the form {async_reply, N, Result}, where Result is the result from the read, either {ok, Data}, eof, or {error, reason()}.

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awrite(ChannelPid, Handle, Data)

View Source
-spec awrite(ChannelPid, Handle, Data) -> {async, N} | Error
          when
              ChannelPid :: pid(),
              Handle :: term(),
              Data :: binary(),
              Error :: {error, reason()},
              N :: term().

Writes to an open file, without waiting for the result. If the handle is valid, the function returns {async, N}, where N is a term guaranteed to be unique between calls of awrite. The result of the write operation is sent as a message to the calling process. This message has the form {async_reply, N, Result}, where Result is the result from the write, either ok, or {error, reason()}.

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close(ChannelPid, Handle)

View Source
-spec close(ChannelPid, Handle) -> ok | Error
         when ChannelPid :: pid(), Handle :: term(), Error :: {error, reason()}.

Equivalent to close/3

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close(ChannelPid, Handle, Timeout)

View Source
-spec close(ChannelPid, Handle, Timeout) -> ok | Error
         when
             ChannelPid :: pid(),
             Handle :: term(),
             Timeout :: timeout(),
             Error :: {error, reason()}.

Closes a handle to an open file or directory on the server.

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del_dir(ChannelPid, Name)

View Source
-spec del_dir(ChannelPid, Name) -> ok | Error
           when ChannelPid :: pid(), Name :: string(), Error :: {error, reason()}.

Equivalent to del_dir/3

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del_dir(ChannelPid, Name, Timeout)

View Source
-spec del_dir(ChannelPid, Name, Timeout) -> ok | Error
           when
               ChannelPid :: pid(),
               Name :: string(),
               Timeout :: timeout(),
               Error :: {error, reason()}.

Deletes a directory specified by Name. The directory must be empty before it can be successfully deleted.

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delete(ChannelPid, Name)

View Source
-spec delete(ChannelPid, Name) -> ok | Error
          when ChannelPid :: pid(), Name :: string(), Error :: {error, reason()}.

Equivalent to delete/3

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delete(ChannelPid, Name, Timeout)

View Source
-spec delete(ChannelPid, Name, Timeout) -> ok | Error
          when
              ChannelPid :: pid(),
              Name :: string(),
              Timeout :: timeout(),
              Error :: {error, reason()}.

Deletes the file specified by Name.

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list_dir(ChannelPid, Path)

View Source
-spec list_dir(ChannelPid, Path) -> {ok, FileNames} | Error
            when
                ChannelPid :: pid(),
                Path :: string(),
                FileNames :: [FileName],
                FileName :: string(),
                Error :: {error, reason()}.

Equivalent to list_dir/3

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list_dir(ChannelPid, Path, Timeout)

View Source
-spec list_dir(ChannelPid, Path, Timeout) -> {ok, FileNames} | Error
            when
                ChannelPid :: pid(),
                Path :: string(),
                Timeout :: timeout(),
                FileNames :: [FileName],
                FileName :: string(),
                Error :: {error, reason()}.

Lists the given directory on the server, returning the filenames as a list of strings.

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make_dir(ChannelPid, Name)

View Source
-spec make_dir(ChannelPid, Name) -> ok | Error
            when ChannelPid :: pid(), Name :: string(), Error :: {error, reason()}.

Equivalent to make_dir/3

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make_dir(ChannelPid, Name, Timeout)

View Source
-spec make_dir(ChannelPid, Name, Timeout) -> ok | Error
            when
                ChannelPid :: pid(),
                Name :: string(),
                Timeout :: timeout(),
                Error :: {error, reason()}.

Creates a directory specified by Name. Name must be a full path to a new directory. The directory can only be created in an existing directory.

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make_symlink(ChannelPid, Name, Target)

View Source
-spec make_symlink(ChannelPid, Name, Target) -> ok | Error
                when
                    ChannelPid :: pid(),
                    Name :: string(),
                    Target :: string(),
                    Error :: {error, reason()}.

Equivalent to make_symlink/4

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make_symlink(ChannelPid, Name, Target, Timeout)

View Source
-spec make_symlink(ChannelPid, Name, Target, Timeout) -> ok | Error
                when
                    ChannelPid :: pid(),
                    Name :: string(),
                    Target :: string(),
                    Timeout :: timeout(),
                    Error :: {error, reason()}.

Creates a symbolic link pointing to Target with the name Name.

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open(ChannelPid, Name, Mode)

View Source
-spec open(ChannelPid, Name, Mode) -> {ok, Handle} | Error
        when
            ChannelPid :: pid(),
            Name :: string(),
            Mode :: [read | write | append | binary | raw],
            Handle :: term(),
            Error :: {error, reason()}.

Equivalent to open/4

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open(ChannelPid, Name, Mode, Timeout)

View Source
-spec open(ChannelPid, Name, Mode, Timeout) -> {ok, Handle} | Error
        when
            ChannelPid :: pid(),
            Name :: string(),
            Mode :: [read | write | append | binary | raw],
            Timeout :: timeout(),
            Handle :: term(),
            Error :: {error, reason()}.

Opens a file on the server and returns a handle, which can be used for reading or writing.

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open_tar(ChannelPid, Path, Mode)

View Source (since OTP 17.4)
-spec open_tar(ChannelPid, Path, Mode) -> {ok, Handle} | Error
            when
                ChannelPid :: pid(),
                Path :: string(),
                Mode :: [read | write | {crypto, tar_crypto_spec()}],
                Handle :: term(),
                Error :: {error, reason()}.

Equivalent to open_tar/4

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open_tar(ChannelPid, Path, Mode, Timeout)

View Source (since OTP 17.4)
-spec open_tar(ChannelPid, Path, Mode, Timeout) -> {ok, Handle} | Error
            when
                ChannelPid :: pid(),
                Path :: string(),
                Mode :: [read | write | {crypto, tar_crypto_spec()}],
                Timeout :: timeout(),
                Handle :: term(),
                Error :: {error, reason()}.

Opens a handle to a tar file on the server, associated with ChannelPid. The handle can be used for remote tar creation and extraction. The actual writing and reading is performed by calls to erl_tar:add/3,4 and erl_tar:extract/2. Note: The erl_tar:init/3 function should not be called, that one is called by this open_tar function.

For code examples see Section SFTP Client with TAR Compression in the ssh Users Guide.

The crypto mode option is explained in the data types section above, see Crypto operations for open_tar. Encryption is assumed if the Mode contains write, and decryption if the Mode contains read.

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opendir(ChannelPid, Path)

View Source
-spec opendir(ChannelPid, Path) -> {ok, Handle} | Error
           when
               ChannelPid :: pid(), Path :: string(), Handle :: term(), Error :: {error, reason()}.

Equivalent to opendir/3

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opendir(ChannelPid, Path, Timeout)

View Source
-spec opendir(ChannelPid, Path, Timeout) -> {ok, Handle} | Error
           when
               ChannelPid :: pid(),
               Path :: string(),
               Timeout :: timeout(),
               Handle :: term(),
               Error :: {error, reason()}.

Opens a handle to a directory on the server. The handle can be used for reading directory contents.

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position(ChannelPid, Handle, Location)

View Source
-spec position(ChannelPid, Handle, Location) -> {ok, NewPosition} | Error
            when
                ChannelPid :: pid(),
                Handle :: term(),
                Location ::
                    Offset | {bof, Offset} | {cur, Offset} | {eof, Offset} | bof | cur | eof,
                Offset :: integer(),
                NewPosition :: integer(),
                Error :: {error, reason()}.

Equivalent to position/4

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position(ChannelPid, Handle, Location, Timeout)

View Source
-spec position(ChannelPid, Handle, Location, Timeout) -> {ok, NewPosition} | Error
            when
                ChannelPid :: pid(),
                Handle :: term(),
                Location ::
                    Offset | {bof, Offset} | {cur, Offset} | {eof, Offset} | bof | cur | eof,
                Timeout :: timeout(),
                Offset :: integer(),
                NewPosition :: integer(),
                Error :: {error, reason()}.

Sets the file position of the file referenced by Handle. Returns {ok, NewPosition} (as an absolute offset) if successful, otherwise {error, reason()}. Location is one of the following:

  • Offset - The same as {bof, Offset}.

  • {bof, Offset} - Absolute offset.

  • {cur, Offset} - Offset from the current position.

  • {eof, Offset} - Offset from the end of file.

  • **`bofcureof** - The same as eariler withOffset` 0, that is,
    `{bof, 0}{cur, 0}{eof, 0}`.
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pread(ChannelPid, Handle, Position, Len)

View Source
-spec pread(ChannelPid, Handle, Position, Len) -> {ok, Data} | eof | Error
         when
             ChannelPid :: pid(),
             Handle :: term(),
             Position :: integer(),
             Len :: integer(),
             Data :: string() | binary(),
             Error :: {error, reason()}.

Equivalent to pread/5

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pread(ChannelPid, Handle, Position, Len, Timeout)

View Source
-spec pread(ChannelPid, Handle, Position, Len, Timeout) -> {ok, Data} | eof | Error
         when
             ChannelPid :: pid(),
             Handle :: term(),
             Position :: integer(),
             Len :: integer(),
             Timeout :: timeout(),
             Data :: string() | binary(),
             Error :: {error, reason()}.

The pread/3,4 function reads from a specified position, combining the position/3 and read/3,4 functions.

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pwrite(ChannelPid, Handle, Position, Data)

View Source
-spec pwrite(ChannelPid, Handle, Position, Data) -> ok | Error
          when
              ChannelPid :: pid(),
              Handle :: term(),
              Position :: integer(),
              Data :: iolist(),
              Error :: {error, reason()}.

Equivalent to pwrite/5

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pwrite(ChannelPid, Handle, Position, Data, Timeout)

View Source
-spec pwrite(ChannelPid, Handle, Position, Data, Timeout) -> ok | Error
          when
              ChannelPid :: pid(),
              Handle :: term(),
              Position :: integer(),
              Data :: iolist(),
              Timeout :: timeout(),
              Error :: {error, reason()}.

The pwrite/3,4 function writes to a specified position, combining the position/3 and write/3,4 functions.

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read(ChannelPid, Handle, Len)

View Source
-spec read(ChannelPid, Handle, Len) -> {ok, Data} | eof | Error
        when
            ChannelPid :: pid(),
            Handle :: term(),
            Len :: integer(),
            Data :: string() | binary(),
            Error :: {error, reason()}.

Equivalent to read/4

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read(ChannelPid, Handle, Len, Timeout)

View Source
-spec read(ChannelPid, Handle, Len, Timeout) -> {ok, Data} | eof | Error
        when
            ChannelPid :: pid(),
            Handle :: term(),
            Len :: integer(),
            Timeout :: timeout(),
            Data :: string() | binary(),
            Error :: {error, reason()}.

Reads Len bytes from the file referenced by Handle. Returns {ok, Data}, eof, or {error, reason()}. If the file is opened with binary, Data is a binary, otherwise it is a string.

If the file is read past eof, only the remaining bytes are read and returned. If no bytes are read, eof is returned.

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read_file(ChannelPid, File)

View Source
-spec read_file(ChannelPid, File) -> {ok, Data} | Error
             when
                 ChannelPid :: pid(),
                 File :: string(),
                 Data :: binary(),
                 Error :: {error, reason()}.

Equivalent to read_file/3

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read_file(ChannelPid, File, Timeout)

View Source
-spec read_file(ChannelPid, File, Timeout) -> {ok, Data} | Error
             when
                 ChannelPid :: pid(),
                 File :: string(),
                 Data :: binary(),
                 Timeout :: timeout(),
                 Error :: {error, reason()}.

Reads a file from the server, and returns the data in a binary.

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read_file_info(ChannelPid, Name)

View Source
-spec read_file_info(ChannelPid, Name) -> {ok, FileInfo} | Error
                  when
                      ChannelPid :: pid(),
                      Name :: string(),
                      FileInfo :: file:file_info(),
                      Error :: {error, reason()}.

Equivalent to read_file_info/3

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read_file_info(ChannelPid, Name, Timeout)

View Source
-spec read_file_info(ChannelPid, Name, Timeout) -> {ok, FileInfo} | Error
                  when
                      ChannelPid :: pid(),
                      Name :: string(),
                      Timeout :: timeout(),
                      FileInfo :: file:file_info(),
                      Error :: {error, reason()}.

Returns a file_info record from the file system object specified by Name or Handle. See file:read_file_info/2 for information about the record.

Depending on the underlying OS:es links might be followed and info on the final file, directory etc is returned. See read_link_info/2 on how to get information on links instead.

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read_link(ChannelPid, Name)

View Source
-spec read_link(ChannelPid, Name) -> {ok, Target} | Error
             when
                 ChannelPid :: pid(),
                 Name :: string(),
                 Target :: string(),
                 Error :: {error, reason()}.

Equivalent to read_link/3

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read_link(ChannelPid, Name, Timeout)

View Source
-spec read_link(ChannelPid, Name, Timeout) -> {ok, Target} | Error
             when
                 ChannelPid :: pid(),
                 Name :: string(),
                 Target :: string(),
                 Timeout :: timeout(),
                 Error :: {error, reason()}.

Reads the link target from the symbolic link specified by name.

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rename(ChannelPid, OldName, NewName)

View Source
-spec rename(ChannelPid, OldName, NewName) -> ok | Error
          when
              ChannelPid :: pid(),
              OldName :: string(),
              NewName :: string(),
              Error :: {error, reason()}.

Equivalent to rename/4

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rename(ChannelPid, OldName, NewName, Timeout)

View Source
-spec rename(ChannelPid, OldName, NewName, Timeout) -> ok | Error
          when
              ChannelPid :: pid(),
              OldName :: string(),
              NewName :: string(),
              Timeout :: timeout(),
              Error :: {error, reason()}.

Renames a file named OldName and gives it the name NewName.

-spec start_channel(ssh:open_socket() | ssh:connection_ref() | ssh:host()) ->
                 {ok, pid()} | {ok, pid(), ssh:connection_ref()} | {error, reason()}.

Equivalent to start_channel/3

-spec start_channel(ssh:open_socket(), [ssh:client_option() | sftp_option()]) ->
                 {ok, pid(), ssh:connection_ref()} | {error, reason()};
             (ssh:connection_ref(), [sftp_option()]) ->
                 {ok, pid()} | {ok, pid(), ssh:connection_ref()} | {error, reason()};
             (ssh:host(), [ssh:client_option() | sftp_option()]) ->
                 {ok, pid(), ssh:connection_ref()} | {error, reason()}.

Equivalent to start_channel/3

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start_channel(Host, Port, UserOptions0)

View Source
-spec start_channel(ssh:host(), inet:port_number(), [ssh:client_option() | sftp_option()]) ->
                 {ok, pid(), ssh:connection_ref()} | {error, reason()}.

start_channel(Host, Port, Options) ->

If no connection reference is provided, a connection is set up, and the new connection is returned. An SSH channel process is started to handle the communication with the SFTP server. The returned pid for this process is to be used as input to all other API functions in this module.

Options:

  • {timeout, timeout()} - There are two ways to set a timeout for the underlying ssh connection:

    • If the connection timeout option connect_timeout is set, that value is used also for the negotiation timeout and this option (timeout) is ignored.
    • Otherwise, this option (timeout) is used as the negotiation timeout only and there is no connection timeout set

    The value defaults to infinity.

  • {sftp_vsn, integer()} - Desired SFTP protocol version. The actual version is the minimum of the desired version and the maximum supported versions by the SFTP server.

All other options are directly passed to ssh:connect/3 or ignored if a connection is already provided.

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stop_channel(ChannelPid)

View Source
-spec stop_channel(ChannelPid) -> ok when ChannelPid :: pid().

Stops an SFTP channel. Does not close the SSH connection. Use ssh:close/1 to close it.

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write(ChannelPid, Handle, Data)

View Source
-spec write(ChannelPid, Handle, Data) -> ok | Error
         when ChannelPid :: pid(), Handle :: term(), Data :: iodata(), Error :: {error, reason()}.

Equivalent to write/4

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write(ChannelPid, Handle, Data, Timeout)

View Source
-spec write(ChannelPid, Handle, Data, Timeout) -> ok | Error
         when
             ChannelPid :: pid(),
             Handle :: term(),
             Data :: iodata(),
             Timeout :: timeout(),
             Error :: {error, reason()}.

Writes data to the file referenced by Handle. The file is to be opened with write or append flag. Returns ok if successful or {error, reason()} otherwise.

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write_file(ChannelPid, File, Data)

View Source
-spec write_file(ChannelPid, File, Data) -> ok | Error
              when
                  ChannelPid :: pid(),
                  File :: string(),
                  Data :: iodata(),
                  Error :: {error, reason()}.

Equivalent to write_file/4

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write_file(ChannelPid, File, Data, Timeout)

View Source
-spec write_file(ChannelPid, File, Data, Timeout) -> ok | Error
              when
                  ChannelPid :: pid(),
                  File :: string(),
                  Data :: iodata(),
                  Timeout :: timeout(),
                  Error :: {error, reason()}.

Writes a file to the server. The file is created if it does not exist but overwritten if it exists.

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write_file_info(ChannelPid, Name, FileInfo)

View Source
-spec write_file_info(ChannelPid, Name, FileInfo) -> ok | Error
                   when
                       ChannelPid :: pid(),
                       Name :: string(),
                       FileInfo :: file:file_info(),
                       Error :: {error, reason()}.

Equivalent to write_file_info/4

Link to this function

write_file_info(ChannelPid, Name, FileInfo, Timeout)

View Source
-spec write_file_info(ChannelPid, Name, FileInfo, Timeout) -> ok | Error
                   when
                       ChannelPid :: pid(),
                       Name :: string(),
                       FileInfo :: file:file_info(),
                       Timeout :: timeout(),
                       Error :: {error, reason()}.

Writes file information from a file_info record to the file specified by Name. See file:write_file_info/2,3 for information about the record.