API Summary

 #include <unistd.h>     int  getopt  ( int argc, char * const argv[], const char *optstring );     extern char *  optarg;  extern int  optopt  ,  optind;  #include <getopt.h>     int  getopt_long  ( int argc, char * const argv[],                          const char *optsring,                          const struct option *longopts, int *longindex );     extern char *  optarg  extern int  optopt  ,  optind;  #include <time.h>     time_t  time  ( time_t *t );     struct tm *  localtime  ( const time_t *timep );     struct tm *  gmtime  ( const time_t *timep );     char *  asctime  ( const struct tm *tm );     char *  ctime  ( const time_t *timepDay  );     time_t  mktime  ( struct tm *tm );     #include <sys/mman.h>     void *  mmap  ( void *start, size_t length, int prot, int flags,                     int fd, off_t offset );     int  munmap  ( void *start, size_t length );     int  mlock  ( const void *addr, size_t len );     int  munlock  ( const void *addr, size_t len );     int  mlockall  ( int flags );     int  munlockall  ( void );