232819dd49
Previously, VFS would use various subsets of a number of fproc structure fields to store state when the process is blocked (suspended) for various reasons. As a result, there was a fair amount of abuse of fields, hidden state, and confusion as to which fields were used with which suspension states. Instead, the suspension state is now split into per-state structures, which are then stored in a union. Each of the union's structures should be accessed only right before, during, and right after the fp_blocked_on field is set to the corresponding blocking type. As a result, it is now very clear which fields are in use at which times, and we even save a bit of memory as a side effect. Change-Id: I5c24e353b6cb0c32eb41c70f89c5cfb23f6c93df
26 lines
814 B
C
26 lines
814 B
C
/* This file is the counterpart of "read.c". It contains the code for writing
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* insofar as this is not contained in read_write().
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*
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* The entry points into this file are
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* do_write: call read_write to perform the WRITE system call
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*/
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#include "fs.h"
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#include "file.h"
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#include <minix/callnr.h>
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/*===========================================================================*
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* do_write *
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*===========================================================================*/
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int do_write(void)
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{
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/* Perform the write(fd, buffer, nbytes) system call. */
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/* See the comment in do_read(). */
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if (job_m_in.m_lc_vfs_readwrite.cum_io != 0)
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return(EINVAL);
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return(do_read_write_peek(WRITING, job_m_in.m_lc_vfs_readwrite.fd,
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job_m_in.m_lc_vfs_readwrite.buf, job_m_in.m_lc_vfs_readwrite.len));
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}
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