53 lines
1.5 KiB
C
53 lines
1.5 KiB
C
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/*
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* io-lseek.c --
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*
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* Copyright (c) 2006 CodeSourcery Inc
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* Copyright (c) 2018 Mentor Graphics
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*
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* The authors hereby grant permission to use, copy, modify, distribute,
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* and license this software and its documentation for any purpose, provided
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* that existing copyright notices are retained in all copies and that this
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* notice is included verbatim in any distributions. No written agreement,
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* license, or royalty fee is required for any of the authorized uses.
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* Modifications to this software may be copyrighted by their authors
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* and need not follow the licensing terms described here, provided that
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* the new terms are clearly indicated on the first page of each file where
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* they apply.
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*/
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#include <sys/types.h>
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#include <unistd.h>
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#include <errno.h>
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#define IO lseek
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#include "io.h"
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/*
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* lseek -- reposition a file descriptor
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* input parameters:
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* 0 : file descriptor
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* 1 : high word of offset
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* 2 : low word of offset
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* 3 : seek flag
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* output parameters:
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* 0 : high word of result
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* 1 : low word of result
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* 2 : errno
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*/
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off_t lseek (int fd, off_t offset, int whence)
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{
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#if HOSTED
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gdb_parambuf_t parameters;
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parameters[0] = (uint32_t) fd;
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parameters[1] = (uint32_t) ((offset >> 32) & 0xffffffff);
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parameters[2] = (uint32_t) (offset & 0xffffffff);
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parameters[3] = __hosted_to_gdb_lseek_flags (whence);
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__io_hosted (HOSTED_LSEEK, parameters);
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errno = __hosted_from_gdb_errno (parameters[2]);
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return ((uint64_t)parameters[0] << 32) | ((uint64_t)parameters[1]);
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#else
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errno = ENOSYS;
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return -1;
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#endif
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}
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