Today's plan

• Posix system calls

Posix calls

• for a complete list, see e.g. here under System Interfaces
• may be implemented as system calls or library functions
• include generic math and string functions
• calls defined in the textbook, p. 28, Figure 1-9
• notable additions (i.e., calls in POSIX but not in the textbook):
  • networking calls such as socket, connect, bind, listen, accept, send, recv, shutdown,
  • calls for mapping files, such as void * mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset) and int munmap(void *start, size_t length)
  • posix threads calls such as pthread_create
  • poll or select to check open file descriptors for I/O availability

Main Minix System Calls

• process management: fork, wait and waitpid, execve, exit, brk, getpid.
• signal handling: sigaction, sigpending, kill, alarm, pause.
• time: time, stime, times.
• file management: open, creat, mknod, close, read, write, seek, stat and fstat, dup2, pipe, access, rename, ioctl, fcntl.
• directory and file system management: mkdir, rmdir, link, unlink (remove), mount, umount, chdir, chroot.
• protection: chmod, getuid, setuid, chown.