From b31d4355ae817aa3caf9414f842cc07465bca028 Mon Sep 17 00:00:00 2001 From: Florian Weimer Date: Wed, 7 Oct 2020 16:39:50 +0200 Subject: elf: Implement _dl_write The generic version is parallel to _dl_writev. It cannot use _dl_writev directly because the errno value needs to be obtained under a lock. Reviewed-by: Adhemerval Zanella --- sysdeps/generic/ldsodefs.h | 6 ++++++ sysdeps/unix/sysv/linux/dl-write.c | 30 ++++++++++++++++++++++++++++++ 2 files changed, 36 insertions(+) create mode 100644 sysdeps/unix/sysv/linux/dl-write.c (limited to 'sysdeps') diff --git a/sysdeps/generic/ldsodefs.h b/sysdeps/generic/ldsodefs.h index ba114ab4b1..7cb1fccc80 100644 --- a/sysdeps/generic/ldsodefs.h +++ b/sysdeps/generic/ldsodefs.h @@ -757,6 +757,12 @@ _dl_dprintf (int fd, const char *fmt, ...) } #endif +/* Write LENGTH bytes at BUFFER to FD, like write. Returns the number + of bytes written on success, or a negative error constant on + failure. */ +ssize_t _dl_write (int fd, const void *buffer, size_t length) + attribute_hidden; + /* Write a message on the specified descriptor standard output. The parameters are interpreted as for a `printf' call. */ void _dl_printf (const char *fmt, ...) diff --git a/sysdeps/unix/sysv/linux/dl-write.c b/sysdeps/unix/sysv/linux/dl-write.c new file mode 100644 index 0000000000..1c6298fb41 --- /dev/null +++ b/sysdeps/unix/sysv/linux/dl-write.c @@ -0,0 +1,30 @@ +/* Implementation of the _dl_write function. Linux version. + Copyright (C) 2020 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 + +ssize_t +_dl_write (int fd, const void *buffer, size_t length) +{ + long int r = INTERNAL_SYSCALL_CALL (write, fd, buffer, length); + if (INTERNAL_SYSCALL_ERROR_P (r)) + r = - INTERNAL_SYSCALL_ERRNO (r); + return r; +} -- cgit 1.4.1