43 lines
774 B
C
43 lines
774 B
C
/* $Source$
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* $State$
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* $Revision$
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*/
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#include <fcntl.h>
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#include "libsys.h"
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/*
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* Set or reset the "end-of-file encountered" indicator for a particular fd.
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* Assume that the fd is valid, and is being read from in text mode.
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*/
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int _sys_seteof(int fd, int eof)
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{
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int reqbegfd = fd & ~_FDVECMASK;
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struct _fdmodes *p = &_sys_fdmodes;
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_fdvec_t mask;
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while (p->begfd != reqbegfd)
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{
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p = p->next;
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if (!p)
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{
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if (!eof)
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return 0;
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if ((p = sbrk(sizeof(struct _fdmodes)))
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== OUT_OF_MEMORY)
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return -1;
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p->next = _sys_fdmodes.next;
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p->begfd = reqbegfd;
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p->modevec = p->eofvec = 0;
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_sys_fdmodes.next = p;
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break;
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}
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}
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mask = (_fdvec_t)1 << (fd & _FDVECMASK);
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if (eof)
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p->eofvec |= mask;
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else
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p->eofvec &= ~mask;
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return 0;
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}
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