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recordmcount: Remove uread()

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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().

Link: http://lkml.kernel.org/r/31a87c22b19150cec1c8dc800c8b0873a2741703.1563992889.git.mhelsley@vmware.com

Signed-off-by: Matt Helsley <mhelsley@vmware.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Matt Helsley 2019-07-24 14:04:56 -07:00 committed by Steven Rostedt (VMware)
parent 1bd95be204
commit a146207916
1 changed files with 5 additions and 13 deletions
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18
scripts/recordmcount.c
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@ -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);