Agilent Technologies E8257D PSG Instrukcja Użytkownika Pobierz pdf (Strona 149)

Agilent N516xA, N518xA, E8663B, E44x8C, and E82x7D Signal Generators Programming Guide 137

Programming Examples

LAN Programming Interface Examples

close(instSock);

#endif /* WINSOCK */

return 0;

}

/***************************************************************************

getopt(3C) getopt(3C)

PROGRAM FILE NAME: getopt.c

getopt - get option letter from argument vector

SYNOPSIS

int getopt(int argc, char * const argv[], const char *optstring);

extern char *optarg;

extern int optind, opterr, optopt;

PRORGAM DESCRIPTION:

getopt returns the next option letter in argv (starting from argv[1])

that matches a letter in optstring. optstring is a string of

recognized option letters; if a letter is followed by a colon, the

option is expected to have an argument that may or may not be

separated from it by white space. optarg is set to point to the start

of the option argument on return from getopt.

getopt places in optind the argv index of the next argument to be

processed. The external variable optind is initialized to 1 before

the first call to the function getopt.

When all options have been processed (i.e., up to the first non-option

argument), getopt returns EOF. The special option -- can be used to

delimit the end of the options; EOF is returned, and -- is skipped.

***************************************************************************/

#include <stdio.h> /* For NULL, EOF */

#include <string.h> /* For strchr() */

char *optarg; /* Global argument pointer. */

int optind = 0; /* Global argv index. */

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Agilent Technologies E8257D PSG Instrukcja Użytkownika Strona 149