OS/161 System calls (user-space APIs)

• errno - error code reporting

• _exit - terminate process
• chdir - change current directory
• close - close file
• dup2 - clone file handles
• execv - execute a program
• fork - copy the current process
• fstat - get file state information
• fsync - flush filesystem data for a specific file to disk
• ftruncate - set size of a file
• __getcwd - get name of current working directory (backend)
• getdirentry - read filename from directory
• getpid - get process id
• ioctl - miscellaneous device I/O operations
• link - create hard link to a file
• lseek - change current position in file
• lstat - get file state information
• mkdir - create directory
• open - open a file
• pipe - create pipe object
• read - read data from file
• readlink - fetch symbolic link contents
• reboot - reboot or halt system
• remove - delete (unlink) a file
• rename - rename or move a file
• rmdir - remove directory
• sbrk - set process break (allocate memory)
• stat - get file state information
• symlink - create symbolic link
• sync - flush filesystem data to disk
• __time - get time of day
• waitpid - wait for a process to exit
• write - write data to file