65 lines
1.7 KiB
C
65 lines
1.7 KiB
C
/* This file contains various utility functions.
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*
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* The entry points into this file are:
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* get_name retrieve a path component string from VFS
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* do_noop handle file system calls that do nothing and succeed
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* no_sys handle file system calls that are not implemented
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*
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* Created:
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* April 2009 (D.C. van Moolenbroek)
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*/
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#include "inc.h"
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/*===========================================================================*
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* get_name *
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*===========================================================================*/
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int get_name(
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cp_grant_id_t grant, /* memory grant for the path component */
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size_t len, /* length of the name, including '\0' */
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char name[NAME_MAX+1] /* buffer in which store the result */
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)
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{
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/* Retrieve a path component from the caller, using a given grant.
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*/
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int r;
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/* Copy in the name of the directory entry. */
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if (len <= 1) return EINVAL;
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if (len > NAME_MAX+1) return ENAMETOOLONG;
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r = sys_safecopyfrom(m_in.m_source, grant, 0, (vir_bytes) name, len);
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if (r != OK) return r;
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if (name[len-1] != 0) {
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printf("%s: VFS did not zero-terminate path component!\n", sffs_name);
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return EINVAL;
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}
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return OK;
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}
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/*===========================================================================*
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* do_noop *
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*===========================================================================*/
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int do_noop(void)
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{
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/* Generic handler for no-op system calls.
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*/
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return OK;
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}
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/*===========================================================================*
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* no_sys *
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*===========================================================================*/
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int no_sys(void)
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{
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/* Generic handler for unimplemented system calls.
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*/
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return ENOSYS;
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}
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