Getsockopt - Advanced Unix Programming - Lecture Slides, Slides of Computer Programming

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Week 9 Topics

• Socket options

• getsockopt, setsockopt
• fcntl
• ioctl

• Introduction to UDP

• TCP vs UDP
• UDP interface

TCP vs UDP

• TCP

• Reliable byte stream service
• Connection setup overhead

• UDP

• Unreliable datagram service
  • Data may get lost
    • Application may need to deal with more details in the communication

UDP interface

• socket, bind, sendto, recvfrom, close

UDP server UDP client

socket socket bind sendto recvfrom recvfrom sendto close

TCP server TCP client

socket socket bind connect listen accept read/write close read/write close

UDP interface ... continued

• #include <sys/socket.h>
  • ssize_t recvfrom(int sockfd, void *buff, size_t nbytes, int flags, struct sockaddr *from, socklen_t *addrlen);
  • ssize_t sendto(int sockfd, void *buff, size_t nbytes, int flags, const struct sockaddr *to, socklen_t addrlen);
• See example1.c and example2.c for communication using UDP
• Lost packets in UDP
  • How does the error rate vary with size of data?