minix/servers/vfs/write.c

   1 /* This file is the counterpart of "read.c".  It contains the code for writing
   2  * insofar as this is not contained in read_write().
   3  *
   4  * The entry points into this file are
   5  *   do_write:     call read_write to perform the WRITE system call
   6  */
   7
   8 #include "fs.h"
   9 #include "file.h"
  10 #include <minix/callnr.h>
  11
  12 /*===========================================================================*
  13  *                              do_write                                     *
  14  *===========================================================================*/
  15 int do_write(void)
  16 {
  17 /* Perform the write(fd, buffer, nbytes) system call. */
  18
  19   /* See the comment in do_read(). */
  20   if (job_m_in.m_lc_vfs_readwrite.cum_io != 0)
  21         return(EINVAL);
  22
  23   return(do_read_write_peek(WRITING, job_m_in.m_lc_vfs_readwrite.fd,
  24         job_m_in.m_lc_vfs_readwrite.buf, job_m_in.m_lc_vfs_readwrite.len));
  25 }