145 lines
4.9 KiB
Diff
145 lines
4.9 KiB
Diff
commit b31d4355ae817aa3caf9414f842cc07465bca028
|
|
Author: Florian Weimer <fweimer@redhat.com>
|
|
Date: Wed Oct 7 16:39:50 2020 +0200
|
|
|
|
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 <adhemerval.zanella@linaro.org>
|
|
|
|
Backport adjusted for different INTERNAL_SYSCALL_CALL definition
|
|
downstream.
|
|
|
|
diff --git a/elf/Makefile b/elf/Makefile
|
|
index ef655630d50b07aa..e2078f6bc325b7e0 100644
|
|
--- a/elf/Makefile
|
|
+++ b/elf/Makefile
|
|
@@ -34,7 +34,7 @@ dl-routines = $(addprefix dl-,load lookup object reloc deps \
|
|
version profile tls origin scope \
|
|
execstack open close trampoline \
|
|
exception sort-maps lookup-direct \
|
|
- call-libc-early-init)
|
|
+ call-libc-early-init write)
|
|
ifeq (yes,$(use-ldconfig))
|
|
dl-routines += dl-cache
|
|
endif
|
|
diff --git a/elf/dl-write.c b/elf/dl-write.c
|
|
new file mode 100644
|
|
index 0000000000000000..7350aff0035d4fbc
|
|
--- /dev/null
|
|
+++ b/elf/dl-write.c
|
|
@@ -0,0 +1,56 @@
|
|
+/* Implementation of the _dl_write function. Generic 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
|
|
+ <https://www.gnu.org/licenses/>. */
|
|
+
|
|
+#include <errno.h>
|
|
+#include <ldsodefs.h>
|
|
+#include <libc-lock.h>
|
|
+#include <sys/uio.h>
|
|
+
|
|
+ssize_t
|
|
+_dl_write (int fd, const void *buffer, size_t length)
|
|
+{
|
|
+ struct iovec iov = { .iov_base = (void *) buffer, .iov_len = length };
|
|
+ ssize_t ret;
|
|
+
|
|
+#if RTLD_PRIVATE_ERRNO
|
|
+ /* We have to take this lock just to be sure we don't clobber the private
|
|
+ errno when it's being used by another thread that cares about it.
|
|
+ Yet we must be sure not to try calling the lock functions before
|
|
+ the thread library is fully initialized. */
|
|
+ if (__glibc_unlikely (_dl_starting_up))
|
|
+ {
|
|
+ ret = __writev (fd, &iov, 1);
|
|
+ if (ret < 0)
|
|
+ ret = -errno;
|
|
+ }
|
|
+ else
|
|
+ {
|
|
+ __rtld_lock_lock_recursive (GL(dl_load_lock));
|
|
+ __writev (fd, &iov, 1);
|
|
+ if (ret < 0)
|
|
+ ret = -errno;
|
|
+ __rtld_lock_unlock_recursive (GL(dl_load_lock));
|
|
+ }
|
|
+#else
|
|
+ ret = __writev (fd, &iov, 1);
|
|
+ if (ret < 0)
|
|
+ ret = -errno;
|
|
+#endif
|
|
+
|
|
+ return ret;
|
|
+}
|
|
diff --git a/sysdeps/generic/ldsodefs.h b/sysdeps/generic/ldsodefs.h
|
|
index 37f1915b0c75a020..4aa28b0229e0b339 100644
|
|
--- a/sysdeps/generic/ldsodefs.h
|
|
+++ b/sysdeps/generic/ldsodefs.h
|
|
@@ -754,6 +754,12 @@ _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. */
|
|
#define _dl_printf(fmt, args...) \
|
|
diff --git a/sysdeps/unix/sysv/linux/dl-write.c b/sysdeps/unix/sysv/linux/dl-write.c
|
|
new file mode 100644
|
|
index 0000000000000000..2c670a8059077076
|
|
--- /dev/null
|
|
+++ b/sysdeps/unix/sysv/linux/dl-write.c
|
|
@@ -0,0 +1,31 @@
|
|
+/* 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
|
|
+ <https://www.gnu.org/licenses/>. */
|
|
+
|
|
+#include <sysdep.h>
|
|
+#include <unistd.h>
|
|
+#include <ldsodefs.h>
|
|
+
|
|
+ssize_t
|
|
+_dl_write (int fd, const void *buffer, size_t length)
|
|
+{
|
|
+ INTERNAL_SYSCALL_DECL (err);
|
|
+ long int r = INTERNAL_SYSCALL_CALL (write, err, fd, buffer, length);
|
|
+ if (INTERNAL_SYSCALL_ERROR_P (r, err))
|
|
+ r = - INTERNAL_SYSCALL_ERRNO (r, err);
|
|
+ return r;
|
|
+}
|