You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
84 lines
3.3 KiB
84 lines
3.3 KiB
1 month ago
|
commit a8c230c881b24af0f6f3f9105f6cd0e7bc05b0de
|
||
|
|
Author: H.J. Lu <hjl.tools@gmail.com>
|
||
|
|
Date: Wed Jul 24 14:05:14 2024 -0700
|
||
|
|
|
||
|
|
mremap: Update manual entry
|
||
|
|
|
||
|
|
Update mremap manual entry:
|
||
|
|
|
||
|
|
1. Change mremap to variadic.
|
||
|
|
2. Document MREMAP_FIXED and MREMAP_DONTUNMAP.
|
||
|
|
|
||
|
|
Signed-off-by: H.J. Lu <hjl.tools@gmail.com>
|
||
|
|
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
|
||
|
|
(cherry picked from commit cb2dee4eccf46642eef588bee64f9c875c408f1c)
|
||
|
|
|
||
|
|
diff --git a/manual/llio.texi b/manual/llio.texi
|
||
|
|
index fae49d14332db675..a65230d612eba7bf 100644
|
||
|
|
--- a/manual/llio.texi
|
||
|
|
+++ b/manual/llio.texi
|
||
|
|
@@ -1781,7 +1781,7 @@ There is no existing mapping in at least part of the given region.
|
||
|
|
|
||
|
|
@end deftypefun
|
||
|
|
|
||
|
|
-@deftypefun {void *} mremap (void *@var{address}, size_t @var{length}, size_t @var{new_length}, int @var{flag})
|
||
|
|
+@deftypefun {void *} mremap (void *@var{address}, size_t @var{length}, size_t @var{new_length}, int @var{flag}, ... /* void *@var{new_address} */)
|
||
|
|
@standards{GNU, sys/mman.h}
|
||
|
|
@safety{@prelim{}@mtsafe{}@assafe{}@acsafe{}}
|
||
|
|
|
||
|
|
@@ -1790,12 +1790,40 @@ area. @var{address} and @var{length} must cover a region entirely mapped
|
||
|
|
in the same @code{mmap} statement. A new mapping with the same
|
||
|
|
characteristics will be returned with the length @var{new_length}.
|
||
|
|
|
||
|
|
-One option is possible, @code{MREMAP_MAYMOVE}. If it is given in
|
||
|
|
-@var{flags}, the system may remove the existing mapping and create a new
|
||
|
|
-one of the desired length in another location.
|
||
|
|
+Possible flags are
|
||
|
|
|
||
|
|
-The address of the resulting mapping is returned, or @math{-1}. Possible
|
||
|
|
-error codes include:
|
||
|
|
+@table @code
|
||
|
|
+
|
||
|
|
+@item MREMAP_MAYMOVE
|
||
|
|
+If it is given in @var{flags}, the system may remove the existing mapping
|
||
|
|
+and create a new one of the desired length in another location.
|
||
|
|
+
|
||
|
|
+@item MREMAP_FIXED
|
||
|
|
+If it is given in @var{flags}, @code{mremap} accepts a fifth argument,
|
||
|
|
+@code{void *new_address}, which specifies a page-aligned address to
|
||
|
|
+which the mapping must be moved. Any previous mapping at the address
|
||
|
|
+range specified by @var{new_address} and @var{new_size} is unmapped.
|
||
|
|
+
|
||
|
|
+@code{MREMAP_FIXED} must be used together with @code{MREMAP_MAYMOVE}.
|
||
|
|
+
|
||
|
|
+@item MREMAP_DONTUNMAP
|
||
|
|
+If it is given in @var{flags}, @code{mremap} accepts a fifth argument,
|
||
|
|
+@code{void *new_address}, which specifies a page-aligned address. Any
|
||
|
|
+previous mapping at the address range specified by @var{new_address} and
|
||
|
|
+@var{new_size} is unmapped. If @var{new_address} is @code{NULL}, the
|
||
|
|
+kernel chooses the page-aligned address at which to create the mapping.
|
||
|
|
+Otherwise, the kernel takes it as a hint about where to place the mapping.
|
||
|
|
+The mapping at the address range specified by @var{old_address} and
|
||
|
|
+@var{old_size} isn't unmapped.
|
||
|
|
+
|
||
|
|
+@code{MREMAP_DONTUNMAP} must be used together with @code{MREMAP_MAYMOVE}.
|
||
|
|
+@var{old_size} must be the same as @var{new_size}. This flag bit is
|
||
|
|
+Linux-specific.
|
||
|
|
+
|
||
|
|
+@end table
|
||
|
|
+
|
||
|
|
+The address of the resulting mapping is returned, or @code{MAP_FAILED}.
|
||
|
|
+Possible error codes include:
|
||
|
|
|
||
|
|
@table @code
|
||
|
|
|
||
|
|
@@ -1804,7 +1832,7 @@ There is no existing mapping in at least part of the original region, or
|
||
|
|
the region covers two or more distinct mappings.
|
||
|
|
|
||
|
|
@item EINVAL
|
||
|
|
-The address given is misaligned or inappropriate.
|
||
|
|
+Any arguments are inappropriate, including unknown @var{flags} values.
|
||
|
|
|
||
|
|
@item EAGAIN
|
||
|
|
The region has pages locked, and if extended it would exceed the
|