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b1dca6 |
commit b31d4355ae817aa3caf9414f842cc07465bca028
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b1dca6 |
Author: Florian Weimer <fweimer@redhat.com>
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b1dca6 |
Date: Wed Oct 7 16:39:50 2020 +0200
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b1dca6 |
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b1dca6 |
elf: Implement _dl_write
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b1dca6 |
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b1dca6 |
The generic version is parallel to _dl_writev. It cannot use
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b1dca6 |
_dl_writev directly because the errno value needs to be obtained
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b1dca6 |
under a lock.
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b1dca6 |
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b1dca6 |
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
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b1dca6 |
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b1dca6 |
Backport adjusted for different INTERNAL_SYSCALL_CALL definition
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b1dca6 |
downstream.
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diff --git a/elf/Makefile b/elf/Makefile
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index ef655630d50b07aa..e2078f6bc325b7e0 100644
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b1dca6 |
--- a/elf/Makefile
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b1dca6 |
+++ b/elf/Makefile
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@@ -34,7 +34,7 @@ dl-routines = $(addprefix dl-,load lookup object reloc deps \
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b1dca6 |
version profile tls origin scope \
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execstack open close trampoline \
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b1dca6 |
exception sort-maps lookup-direct \
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- call-libc-early-init)
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+ call-libc-early-init write)
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ifeq (yes,$(use-ldconfig))
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dl-routines += dl-cache
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endif
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b1dca6 |
diff --git a/elf/dl-write.c b/elf/dl-write.c
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b1dca6 |
new file mode 100644
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index 0000000000000000..7350aff0035d4fbc
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--- /dev/null
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b1dca6 |
+++ b/elf/dl-write.c
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@@ -0,0 +1,56 @@
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+/* Implementation of the _dl_write function. Generic version.
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b1dca6 |
+ Copyright (C) 2020 Free Software Foundation, Inc.
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b1dca6 |
+ This file is part of the GNU C Library.
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+
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+ The GNU C Library is free software; you can redistribute it and/or
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b1dca6 |
+ modify it under the terms of the GNU Lesser General Public
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b1dca6 |
+ License as published by the Free Software Foundation; either
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b1dca6 |
+ version 2.1 of the License, or (at your option) any later version.
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b1dca6 |
+
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b1dca6 |
+ The GNU C Library is distributed in the hope that it will be useful,
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b1dca6 |
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
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b1dca6 |
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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b1dca6 |
+ Lesser General Public License for more details.
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b1dca6 |
+
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b1dca6 |
+ You should have received a copy of the GNU Lesser General Public
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b1dca6 |
+ License along with the GNU C Library; if not, see
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b1dca6 |
+ <https://www.gnu.org/licenses/>. */
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+
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b1dca6 |
+#include <errno.h>
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b1dca6 |
+#include <ldsodefs.h>
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b1dca6 |
+#include <libc-lock.h>
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b1dca6 |
+#include <sys/uio.h>
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+
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b1dca6 |
+ssize_t
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b1dca6 |
+_dl_write (int fd, const void *buffer, size_t length)
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+{
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b1dca6 |
+ struct iovec iov = { .iov_base = (void *) buffer, .iov_len = length };
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+ ssize_t ret;
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+
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b1dca6 |
+#if RTLD_PRIVATE_ERRNO
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+ /* We have to take this lock just to be sure we don't clobber the private
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+ errno when it's being used by another thread that cares about it.
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b1dca6 |
+ Yet we must be sure not to try calling the lock functions before
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+ the thread library is fully initialized. */
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b1dca6 |
+ if (__glibc_unlikely (_dl_starting_up))
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+ {
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b1dca6 |
+ ret = __writev (fd, &iov, 1);
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b1dca6 |
+ if (ret < 0)
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b1dca6 |
+ ret = -errno;
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b1dca6 |
+ }
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b1dca6 |
+ else
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b1dca6 |
+ {
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b1dca6 |
+ __rtld_lock_lock_recursive (GL(dl_load_lock));
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b1dca6 |
+ __writev (fd, &iov, 1);
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b1dca6 |
+ if (ret < 0)
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b1dca6 |
+ ret = -errno;
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b1dca6 |
+ __rtld_lock_unlock_recursive (GL(dl_load_lock));
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b1dca6 |
+ }
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b1dca6 |
+#else
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b1dca6 |
+ ret = __writev (fd, &iov, 1);
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b1dca6 |
+ if (ret < 0)
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b1dca6 |
+ ret = -errno;
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b1dca6 |
+#endif
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b1dca6 |
+
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b1dca6 |
+ return ret;
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b1dca6 |
+}
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b1dca6 |
diff --git a/sysdeps/generic/ldsodefs.h b/sysdeps/generic/ldsodefs.h
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b1dca6 |
index 37f1915b0c75a020..4aa28b0229e0b339 100644
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b1dca6 |
--- a/sysdeps/generic/ldsodefs.h
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b1dca6 |
+++ b/sysdeps/generic/ldsodefs.h
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b1dca6 |
@@ -754,6 +754,12 @@ _dl_dprintf (int fd, const char *fmt, ...)
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b1dca6 |
}
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b1dca6 |
#endif
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b1dca6 |
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b1dca6 |
+/* Write LENGTH bytes at BUFFER to FD, like write. Returns the number
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b1dca6 |
+ of bytes written on success, or a negative error constant on
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b1dca6 |
+ failure. */
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b1dca6 |
+ssize_t _dl_write (int fd, const void *buffer, size_t length)
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b1dca6 |
+ attribute_hidden;
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b1dca6 |
+
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b1dca6 |
/* Write a message on the specified descriptor standard output. The
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b1dca6 |
parameters are interpreted as for a `printf' call. */
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b1dca6 |
#define _dl_printf(fmt, args...) \
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diff --git a/sysdeps/unix/sysv/linux/dl-write.c b/sysdeps/unix/sysv/linux/dl-write.c
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b1dca6 |
new file mode 100644
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b1dca6 |
index 0000000000000000..2c670a8059077076
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b1dca6 |
--- /dev/null
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b1dca6 |
+++ b/sysdeps/unix/sysv/linux/dl-write.c
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b1dca6 |
@@ -0,0 +1,31 @@
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b1dca6 |
+/* Implementation of the _dl_write function. Linux version.
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b1dca6 |
+ Copyright (C) 2020 Free Software Foundation, Inc.
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b1dca6 |
+ This file is part of the GNU C Library.
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b1dca6 |
+
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b1dca6 |
+ The GNU C Library is free software; you can redistribute it and/or
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b1dca6 |
+ modify it under the terms of the GNU Lesser General Public
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b1dca6 |
+ License as published by the Free Software Foundation; either
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b1dca6 |
+ version 2.1 of the License, or (at your option) any later version.
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b1dca6 |
+
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b1dca6 |
+ The GNU C Library is distributed in the hope that it will be useful,
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b1dca6 |
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
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b1dca6 |
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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b1dca6 |
+ Lesser General Public License for more details.
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b1dca6 |
+
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b1dca6 |
+ You should have received a copy of the GNU Lesser General Public
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b1dca6 |
+ License along with the GNU C Library; if not, see
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b1dca6 |
+ <https://www.gnu.org/licenses/>. */
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b1dca6 |
+
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b1dca6 |
+#include <sysdep.h>
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b1dca6 |
+#include <unistd.h>
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b1dca6 |
+#include <ldsodefs.h>
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b1dca6 |
+
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b1dca6 |
+ssize_t
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b1dca6 |
+_dl_write (int fd, const void *buffer, size_t length)
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b1dca6 |
+{
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b1dca6 |
+ INTERNAL_SYSCALL_DECL (err);
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b1dca6 |
+ long int r = INTERNAL_SYSCALL_CALL (write, err, fd, buffer, length);
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b1dca6 |
+ if (INTERNAL_SYSCALL_ERROR_P (r, err))
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b1dca6 |
+ r = - INTERNAL_SYSCALL_ERRNO (r, err);
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b1dca6 |
+ return r;
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b1dca6 |
+}
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