[RFC][PATCH 02/13] recordmcount: Remove uread()

Matt Helsley
2019-05-23T00:03:58Z

uread() is only used to initialize the ELF file's pseudo
private-memory mapping while uwrite() and ulseek() work within
the pseudo-mapping and extend it as necessary. Thus it is not
a complementary function to uwrite() and ulseek(). It also makes
no sense to do cleanups inside uread() when its only caller,
mmap_file(), is doing the relevant allocations and associated
initializations.

Therefore it's clearer to use a plain read() call to initialize the
data in mmap_file() and remove uread().

Signed-off-by: Matt Helsley <mhelsley@vmware.com>
---
scripts/recordmcount.c | 18 +++++-------------
1 file changed, 5 insertions(+), 13 deletions(-)

diff --git a/scripts/recordmcount.c b/scripts/recordmcount.c
index 7f835059e7c2..30ef6da68e12 100644
--- a/scripts/recordmcount.c
+++ b/scripts/recordmcount.c
@@ -89,7 +89,7 @@ succeed_file(void)
longjmp(jmpenv, SJ_SUCCEED);
}

-/* ulseek, uread, ...: Check return value for errors. */
+/* ulseek, uwrite, ...: Check return value for errors. */

static off_t
ulseek(int const fd, off_t const offset, int const whence)
@@ -112,17 +112,6 @@ ulseek(int const fd, off_t const offset, int const whence)
return file_ptr - file_map;
}

-static size_t
-uread(int const fd, void *const buf, size_t const count)
-{
- size_t const n = read(fd, buf, count);
- if (n != count) {
- perror("read");
- fail_file();
- }
- return n;
-}
-
static size_t
uwrite(int const fd, void const *const buf, size_t const count)
{
@@ -298,7 +287,10 @@ static void *mmap_file(char const *fname)
if (file_map == MAP_FAILED) {
mmap_failed = 1;
file_map = umalloc(sb.st_size);
- uread(fd_map, file_map, sb.st_size);
+ if (read(fd_map, file_map, sb.st_size) != sb.st_size) {
+ perror(fname);
+ fail_file();
+ }
}
close(fd_map);

--
2.20.1