udhcpd: add -f "foreground" and -S "syslog" options

udhcpc: add -S "syslog" options
remove CONFIG_FEATURE_UDHCP_SYSLOG

function                                             old     new   delta
udhcpd_main                                         1168    1201     +33
udhcpc_main                                         2414    2425     +11
static.udhcpc_longopts                               191     200      +9
qgravechar                                           112     108      -4
packed_usage                                       22843   22827     -16
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 3/2 up/down: 53/-20)             Total: 33 bytes

1 files changed, 19 insertions, 17 deletions

diff --git a/include/usage.h b/include/usage.h
index d01e3e4f3..1d4459df1 100644
--- a/include/usage.h
+++ b/include/usage.h
@@ -3654,27 +3654,29 @@ USE_FEATURE_RUN_PARTS_FANCY("\n	-l	Prints names of all matching files even when
        "[-Cfbnqtv] [-c CID] [-V VCLS] [-H HOSTNAME] [-i INTERFACE]\n" \
        "        [-p pidfile] [-r IP] [-s script]"
 #define udhcpc_full_usage \
-       "        -V,--vendorclass=CLASSID        Set vendor class identifier\n" \
-       "        -i,--interface=INTERFACE        Interface to use (default: eth0)\n" \
-       "        -H,-h,--hostname=HOSTNAME       Client hostname\n" \
-       "        -c,--clientid=CLIENTID  Set client identifier\n" \
-       "        -C,--clientid-none      Suppress default client identifier\n" \
-       "        -p,--pidfile=file       Store process ID of daemon in file\n" \
-       "        -r,--request=IP         IP address to request (default: none)\n" \
-       "        -s,--script=file        Run file at dhcp events (default: /usr/share/udhcpc/default.script)\n" \
-       "        -t,--retries=NUM        Send up to NUM request packets\n"\
-       "        -f,--foreground Do not fork after getting lease\n" \
-       "        -b,--background Fork to background if lease cannot be immediately negotiated\n" \
-       "        -n,--now        Exit with failure if lease cannot be immediately negotiated\n" \
-       "        -q,--quit       Quit after obtaining lease\n" \
-       "        -R,--release    Release IP on quit\n" \
-       "        -v,--version    Display version" \
+       "\n      -V,--vendorclass=CLASSID        Set vendor class identifier" \
+       "\n      -i,--interface=INTERFACE        Interface to use (default: eth0)" \
+       "\n      -H,-h,--hostname=HOSTNAME       Client hostname" \
+       "\n      -c,--clientid=CLIENTID  Set client identifier" \
+       "\n      -C,--clientid-none      Suppress default client identifier" \
+       "\n      -p,--pidfile=file       Store process ID of daemon in file" \
+       "\n      -r,--request=IP         IP address to request" \
+       "\n      -s,--script=file        Run file at dhcp events (default: /usr/share/udhcpc/default.script)" \
+       "\n      -t,--retries=N          Send up to N request packets"\
+       "\n      -f,--foreground Stay in foreground" \
+       "\n      -b,--background Background if lease cannot be immediately negotiated" \
+       "\n      -S,--syslog     Log to syslog too" \
+       "\n      -n,--now        Exit with failure if lease cannot be immediately negotiated" \
+       "\n      -q,--quit       Quit after obtaining lease" \
+       "\n      -R,--release    Release IP on quit" \
+       "\n      -v,--version    Display version" \
 
 #define udhcpd_trivial_usage \
-       "[configfile]" \
+       "[-fS] [configfile]" \
 
 #define udhcpd_full_usage \
-       ""
+       "\n      -f      Stay in foreground" \
+       "\n      -S      Log to syslog too"
 
 #define umount_trivial_usage \
        "[flags] FILESYSTEM|DIRECTORY"