From 04e7e2658c4ffe1a96fb445cbfe583a9d51ca622 Mon Sep 17 00:00:00 2001 From: Adhemerval Zanella Netto Date: Wed, 19 Oct 2022 19:14:18 -0300 Subject: Linux: consolidate sendfile implementation This is similar to other LFS consolidation, where the non-LFS is only built if __OFF_T_MATCHES_OFF64_T is not defined and the LFS version is aliased to non-LFS name if __OFF_T_MATCHES_OFF64_T is defined. For non-LFS variant, use sendfile syscall if defined, otherwise use sendfile64 plus the offset overflow check (as generic implementation). Checked on x86_64-linux-gnu. Reviewed-by: Carlos O'Donell Tested-by: Carlos O'Donell --- sysdeps/unix/sysv/linux/sendfile.c | 55 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 55 insertions(+) create mode 100644 sysdeps/unix/sysv/linux/sendfile.c (limited to 'sysdeps/unix/sysv/linux/sendfile.c') diff --git a/sysdeps/unix/sysv/linux/sendfile.c b/sysdeps/unix/sysv/linux/sendfile.c new file mode 100644 index 0000000..c8bc890 --- /dev/null +++ b/sysdeps/unix/sysv/linux/sendfile.c @@ -0,0 +1,55 @@ +/* Transfer data between file descriptors. Linux version. + Copyright (C) 2011-2022 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library. If not, see + . */ + +#include +#include +#include +#include + +#ifndef __OFF_T_MATCHES_OFF64_T + +/* Send COUNT bytes from file associated with IN_FD starting at OFFSET to + descriptor OUT_FD. */ +ssize_t +sendfile (int out_fd, int in_fd, off_t *offset, size_t count) +{ +# ifdef __NR_sendfile + return INLINE_SYSCALL_CALL (sendfile, out_fd, in_fd, offset, count); +# else + __off64_t off64; + int rc; + + if (offset != NULL) + { + if (*offset < 0 || (off_t) (*offset + count) < 0) + { + __set_errno (EINVAL); + return -1; + } + off64 = *offset; + } + + rc = INLINE_SYSCALL_CALL (sendfile64, out_fd, in_fd, offset ? &off64 : NULL, + count); + if (offset) + *offset = off64; + return rc; +# endif +} + +#endif -- cgit v1.1