handle - SFTP File Handle as returned by libssh2_sftp_open_ex,
attrs - Pointer to an LIBSSH2_SFTP_ATTRIBUTES structure to set file metadata from or into depending on the value of setstat.
setstat - When non-zero, the file's metadata will be updated with the data found in attrs according to the values of attrs->flags and other relevant member attributes.
LIBSSH2_SFTP_ATTRIBUTES is a typedefed struct that is defined as below
You will find a full set of defines and macros to identify flags and permissions on the libssh2_sftp.h header file, but some of the most common ones are:
To check for specific user permissions, the set of defines are in the pattern LIBSSH2_SFTP_S_I<action><who> where <action> is R, W or X for read, write and executable and <who> is USR, GRP and OTH for user, group and other. So, you check for a user readable file, use the bit LIBSSH2_SFTP_S_IRUSR while you want to see if it is executable for other, you use LIBSSH2_SFTP_S_IXOTH and so on.
To check for specific file types, you would previously (before libssh2 1.2.5) use the standard posix S_IS***() macros, but since 1.2.5 libssh2 offers its own set of macros for this functionality:
Test for a symbolic link
Test for a regular file
Test for a directory
Test for a character special file
Test for a block special file
Test for a pipe or FIFO special file
LIBSSH2_ERROR_ALLOC - An internal memory allocation call failed.
LIBSSH2_ERROR_SOCKET_SEND - Unable to send data on socket.
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