[PATCH 1/2] wget: replace set_alarm with non blocking functions to support retries

[Denys Vlasenko]

Throws a warning:

networking/wget.c: In function 'fread_buffered':
networking/wget.c:575: error: declaration of 'read' shadows a global declaration

Way too large, and adds to bss:

function                                             old     new   delta
fgets_buffer                                           -    4096   +4096
fgets_trim_sanitize                                  128     621    +493
retrieve_file_data                                   579     775    +196
open_socket                                           49     117     +68
fgets_buffer_len                                       -       4      +4
wget_main                                           2437    2435      -2
set_alarm                                             27       -     -27
------------------------------------------------------------------------------
(add/remove: 2/1 grow/shrink: 3/1 up/down: 4857/-29)         Total: 4828 bytes
   text       data        bss        dec        hex    filename
 979050        485       7296     986831      f0ecf    busybox_old
 979775        485      11400     991660      f21ac    busybox_unstripped

The second patch is mangled by gmail, please resend as attachment.

I played with a version where one try is done in a child,
see attached z.diff.

function                                             old     new   delta
download_one_url                                       -    2221   +2221
retrieve_file_data                                   579     602     +23
ftpcmd                                               133     151     +18
get_sanitized_hdr                                    156     162      +6
fgets_trim_sanitize                                  128     131      +3
base64enc                                             46      49      +3
packed_usage                                       33070   33042     -28
wget_main                                           2437     565   -1872
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 5/2 up/down: 2274/-1900)        Total: 374 bytes

I'm not entirely happy with this approach either...
...probably need to rewrite existing code to get rid of fgets(),
use poll() + read().
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