write() in sys/uio.h returns -1

Question

I'm using Ubuntu Server 9.10 AMD Phenom 2 cpu g++ (Ubuntu 4.4.1-4ubuntu9) 4.4.1

trying to run the application pftp-shit v 1.11, which runs successfully until the remote file list is going to be saved (into .pftp//pftpfxp--).

The following code in tcp.cc is executed successfully:

int outfile_fd = open(name, O_CREAT | O_TRUNC | O_RDWR | O_BINARY)

which returns a file descriptor int (in my case 6) - name is a char array containing a valid path to my file which successfully i created. and successfully running:

fchmod(outfile_fd, S_IRUSR | S_IWUSR);

and

access(name, W_OK)

The issue occurs during running the function (from sys/uio.h)

write(outfile_fd, this->control_buffer, read_length)

which returns -1. -1 is of returned if nothing was written and otherwise a non-negative integer is returned which is equal to the number of bytes written.

Anyone having a clue how I can get the write function to work?

Answer 1

On error, -1 is returned, and errno is set appropriately.

Perhaps errno could give you some hints about what's wrong.

write(outfile_fd, this->control_buffer, read_length);

Does read_length contain correct number of bytes to be written?

Answer 2

Are the directory and file definitely writable by the user attempting the write? Maybe try running it in /tmp just as a test.