74 lines
3.9 KiB
C
74 lines
3.9 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/calls/calls.h"
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#include "libc/calls/internal.h"
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#include "libc/dce.h"
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#include "libc/errno.h"
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#include "libc/sysv/errfuns.h"
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static ssize_t splicer(int infd, int64_t *inoffset, int outfd,
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int64_t *outoffset, size_t uptobytes, uint32_t flags,
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int64_t impl(int infd, int64_t *inoffset, int outfd,
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int64_t *outoffset, size_t uptobytes,
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uint32_t flags)) {
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int olderr;
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ssize_t transferred;
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if (!uptobytes || flags == -1) return einval();
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if (IsModeDbg() && uptobytes > 1) uptobytes >>= 1;
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olderr = errno;
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if ((transferred =
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impl(infd, inoffset, outfd, outoffset, uptobytes, flags)) == -1 &&
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errno == ENOSYS) {
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errno = olderr;
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transferred = copyfd(infd, inoffset, outfd, outoffset, uptobytes, flags);
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}
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return transferred;
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}
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/**
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* Transfers data to/from pipe.
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*
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* @param flags can have SPLICE_F_{MOVE,NONBLOCK,MORE,GIFT}
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* @return number of bytes transferred, 0 on input end, or -1 w/ errno
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* @see copy_file_range() for file ↔ file
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* @see sendfile() for seekable → socket
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*/
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ssize_t splice(int infd, int64_t *inopt_out_inoffset, int outfd,
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int64_t *inopt_out_outoffset, size_t uptobytes, uint32_t flags) {
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return splicer(infd, inopt_out_inoffset, outfd, inopt_out_outoffset,
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uptobytes, flags, splice$sysv);
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}
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/**
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* Transfers data between files.
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*
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* @param outfd should be a writable file, but not O_APPEND
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* @param flags is reserved for future use
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* @return number of bytes actually copied, or -1 w/ errno
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* @see sendfile() for seekable → socket
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* @see splice() for fd ↔ pipe
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*/
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ssize_t copy_file_range(int infd, int64_t *inopt_out_inoffset, int outfd,
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int64_t *inopt_out_outoffset, size_t uptobytes,
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uint32_t flags) {
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return splicer(infd, inopt_out_inoffset, outfd, inopt_out_outoffset,
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uptobytes, flags, copy_file_range$sysv);
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}
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