Should program exit, When close() failed for O_RDONLY mode

[Lin, Cuiping]

Hi,
 
 I find that most of the code does not check the return value of close(),  When 
open a file for reading(O_RDONLY).

 But I find that it checks the return value of close() in code 
"src/bin/pg_rewind/copy_fetch.c" When open a file for reading(O_RDONLY).
 And it will call pg_fatal to cause premature exit. 

 I think that when closing a read-only file fails, it shouid not exit  the 
program early.It  should ensure that the program execution is completed.
 Like below:

・src/bin/pg_rewind/copy_fetch.c

before
--------------------------
rewind_copy_file_range
{
...
if (close(srcfd) != 0)
                pg_fatal("could not close file \"%s\": %m", srcpath); }
--------------------------

after
--------------------------
rewind_copy_file_range
{
...
        close(srcfd);
}
-------------------------- 
 
Regards,
--
Lin