ERRORS

write(), pwrite(), writev(), and pwritev() will fail and the file pointer will remain unchanged if:

[EBADF]
    d is not a valid descriptor open for writing.

[EFBIG]
    An attempt was made to write a file that exceeds the process’s file size limit or the maximum file size.

[ENOSPC]
    There is no free space remaining on the file system containing the file.

[EDQUOT]
    The user’s quota of disk blocks on the file system containing the file has been exhausted.

[EINTR]
    A write to a slow device (i.e. one that might block for an arbitrary amount of time) was interrupted by the delivery of a signal before any data could be written.

[EIO]
    An I/O error occurred while reading from or writing to the file system.

[EFAULT]
    Part of buf points outside the process’s allocated address space.

In addition, write() and writev() may return the following errors:

[EPIPE]
    An attempt is made to write to a pipe that is not open for reading by any process.

[EPIPE]
    An attempt is made to write to a socket of type SOCK_STREAM that is not connected to a peer socket.

[EAGAIN]
    The file was marked for non-blocking I/O, and no data could be written immediately.

[ENETDOWN]
    The destination address specified a network that is down.

[EDESTADDRREQ]
    The destination is no longer available when writing to a Unix-domain datagram socket on which connect(2) had been used to set a destination address.

[EIO]
    The process is a member of a background process attempting to write to its controlling terminal, TOSTOP is set on the terminal, the process isn’t ignoring the SIGTTOUT signal and the thread isn’t blocking the SIGTTOUT signal, and either the process was created with vfork(2) and hasn’t successfully executed one of the exec functions or the process group is orphaned.

write() and pwrite() may return the following error:

[EINVAL]
    nbytes was larger than SSIZE_MAX.

pwrite() and pwritev() may return the following error:

[EINVAL]
    offset was negative.

[ESPIPE]
    d is associated with a pipe, socket, FIFO, or tty.

writev() and pwritev() may return one of the following errors:

[EINVAL]
    iovcnt was less than or equal to 0, or greater than IOV_MAX.

[EINVAL]
    The sum of the iov_len values in the iov array overflowed an ssize_t.

[EFAULT]
    Part of iov points outside the process’s allocated address space.

[ENOBUFS]
    The system lacked sufficient buffer space or a queue was full.