5.2.2.1 Receiving Command-line Options
When a server is booted, its first task is to read the server
options specified in the configuration file up to the point that it
receives an EOF indication. To do so, the server calls the
getopt
(3) UNIX function. The presence of a double dash
(--
) on the command line causes the
getopt()
function to return an EOF. The
getopt
function places the argv
index of
the next argument to be processed in the external variable
optind
. The predefined main()
then calls
tpsvrinit()
.
The following listing shows how the tpsvrinit()
function is used to receive command-line options.
Listing Receiving Command-line Options in tpsvrinit( )
tpsvrinit(argc, argv)
int argc;
char **argv;
{
int c;
extern char *optarg;
extern int optind;
.
.
.
while((c = getopt(argc, argv, "f:x:")) != EOF)
switch(c){
.
.
.
}
.
.
.
}
When main()
calls tpsvrinit()
, it
picks up any arguments that follow the double dash
(--
) on the command line. In the example above,
options f
and x
each takes an argument,
as indicated by the colon. optarg
points to the
beginning of the option argument. The switch statement logic is
omitted.
Parent topic: System-Supplied Services: tpsvrinit( ) Function