52 lines
1.2 KiB
C++
52 lines
1.2 KiB
C++
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/* Duplicate file handle */
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/* Copyright (c) Mix Software 1988 */
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int dup(fd)
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int fd;
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{ /* duplicate a file descriptor - both descriptors use the
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same file pointer. */
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extern int errno, _doserrno;
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extern int _dupcnt_;
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int handle;
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if (fd < 0 || fd > MAXFILES || _iob[fd] == NULL) {
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errno = EBADF;
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return -1;
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}
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if (_sys_ab(0x4500,_iob[fd]->file.handle,&handle) != 0) {
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errno = _doserrno;
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return -1;
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}
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if (_iob[handle] != NULL) {
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errno = EMFILE;
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return -1;
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}
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_iob[handle] = _iob[fd];
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_dupcnt_++;
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return handle;
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} /* dup */
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int dup2(fd1, fd2)
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int fd1, fd2;
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{ /* duplicate a file descriptor - both descriptors use the
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same file pointer. */
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extern int errno, _doserrno;
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extern int _dupcnt_;
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int handle;
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if (fd1 < 0 || fd1 > MAXFILES || _iob[fd1] == NULL ||
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fd2 < 0 || fd2 > MAXFILES) {
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errno = EBADF;
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return -1;
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}
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if (_iob[fd2] != NULL) {
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if (close(fd2) != 0) { errno = EBADF; return -1; }
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}
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if (_sysabcd(0x4600,fd1,fd2,0,&handle) != 0) {
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errno = _doserrno;
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return -1;
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}
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_iob[fd2] = _iob[fd1];
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_dupcnt_++;
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return 0;
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} /* dup2 */
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