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       parse_opts - parse standard and user options for LTP test programs


       #include ”test.h”
       #include ”usctest.h”

       char *parse_opts(int argc, char *argv[],
                        option_t option_array[],
                        void (*user_help_func)());


       The  parse_opts() routine parses options from the command line, looking for user specified
       options or standard options (see below). Its arguments argc  and  argv  are  the  argument
       count  and  array as passed to the main() function on program invocation. User options may
       be specified in the option_array argument.  A  help  function  may  be  specified  in  the
       user_help_func argument.

       option_array  is a pointer to the first element of an array of option_t.  If no additional
       options are needed, pass NULL.  option_t is declared in usctest.h as

          typedef struct {
              char *option;
              int  *flag;
              char **arg;
          } option_t;

       The meanings of the different fields are:

       option is a valid option string to be given to getopt().

       flag   is a pointer to an integer location to set true if option is given in  argv.   This
              can be NULL if the option doesn't require an argument.

       arg    is  a  pointer  to  a  character  pointer variable that will be set with the option
              argument if the option is present in argv.  This pointer MUST be  provided  if  the
              option can take an argument.  Failure to provide a location will cause parse_opts()
              to return an error.

       user_help_func is a pointer to a function that will be called when the -h option is found.
       This  function should print help messages for the options in option_array to standard out.
       The standard help messages are formatted such that the option designator starts in  column
       3 and the description starts in column 11.


       Below is a list of the standard options defined in parse_opts():

       -c n   Run  n copies of the test in parallel.  This is done by forking n times and running
              the test as usual.  If -i or -I are specified,  each  process  will  run  for  that
              amount of time.

       -e     Turn  on logging all errno's received.  This option is to facilitate security audit
              testing for MLS.

       -f     Suppresses functional testing messages.

       -h     Print help message.  The standard options will be printed first,  then  a  call  to
              user_help_func() will be made.

       -i n   Run for n iterations. A value of 0 makes the test loop infinitely.  (default 1)

       -I x   The test will loop until x seconds have passed. (default 0.0)

       -p     Pause  for  SIGUSR1  before testing. The test will pause were you place TEST_PAUSE.
              Warning: The test will also fork at this point if -c is used.

       -P x   This option will do a delay of x seconds after each iteration. (default 0.0)

       -t     Produce timing statistics. *NOT IMPLEMENTED*

       The STD_* flags are used by system call test macros defined in usctest.h (see usctest(3)),
       or may be used in the user's code.


       parse_opts()  returns  a  NULL  pointer  upon successful completion.  If an error occurs a
       pointer to an error message is returned.


       The following example defines two options, one with an argument, one without.

       int fflag, Tflag;   /* binary flags: opt or not */
       char *Topt;         /* option arguments */

       option_t options[] = {
            { "F", &fflag, NULL },        /* No argument */
            { "T:",   &Tflag, &Topt },    /* argument required */
            { NULL, NULL, NULL }          /* NULL required to end array */

       void help()
            printf("  -F       An option with no argument\n");
            printf("  -T opt   An option that requires an argument\n");

       int main(int argc, char *argv[])
            char *msg;

            if ( (msg=parse_opts(argc, argv, options, &help)) != NULL )

            return 0;

       The following example shows how to use parse_opts() without defining new options.

       int main(int argc, char *argv[])
            char *msg;

            if ((msg=parse_opts(argc, argv, (option_t *)NULL, NULL)) != NULL)

            return 0;


       usctest(3), getopt(3).