Minishell

Allowed Functions

<fcntl.h>

• open
  • int open(const char *pathname, int flags, ...);
  • Opens a file specified by pathname. The flags argument determines the file access mode and file status flags.

<dirent.h>

• opendir
  • DIR *opendir(const char *name);
  • Opens a directory stream corresponding to the directory name, and returns a pointer to the directory stream.
• readdir
  • struct dirent *readdir(DIR *dirp);
  • Reads the next directory entry from the directory stream pointed to by dirp.
• closedir
  • int closedir(DIR *dirp);
  • Closes the directory stream associated with dirp.

<stdlib.h>

• malloc
  • void *malloc(size_t size);
  • Allocates size bytes of memory and returns a pointer to the allocated memory.
• free
  • void free(void *ptr);
  • Frees the memory space pointed to by ptr, which must have been returned by a previous call to malloc.

<stdio.h>

• printf
  • int printf(const char *format, ...);
  • Sends formatted output to stdout.

<sys/stat.h>

• stat
  • int stat(const char *pathname, struct stat *statbuf);
  • Retrieves information about the file pointed to by pathname and fills in the stat structure.
• lstat
  • int lstat(const char *pathname, struct stat *statbuf);
  • Similar to stat, but does not follow symbolic links.
• fstat
  • int fstat(int fd, struct stat *statbuf);
  • Retrieves information about the file referred to by the open file descriptor fd.

<sys/wait.h>

• wait
  • pid_t wait(int *wstatus);
  • Suspends execution of the calling process until one of its children terminates.
• waitpid
  • pid_t waitpid(pid_t pid, int *wstatus, int options);
  • Suspends execution of the calling process until the child specified by pid changes state.
• wait3
  • pid_t wait3(int *wstatus, int options, struct rusage *rusage);
  • Similar to wait, but also returns resource usage information.
• wait4
  • pid_t wait4(pid_t pid, int *wstatus, int options, struct rusage *rusage);
  • Similar to waitpid, but also returns resource usage information.

<signal.h>

• signal
  • void (*signal(int signum, void (*handler)(int)))(int);
  • Sets a function to handle signal signum.
• sigaction
  • int sigaction(int signum, const struct sigaction *act, struct sigaction *oldact);
  • Examines and changes the action associated with a specific signal.
• sigemptyset
  • int sigemptyset(sigset_t *set);
  • Initializes the signal set pointed to by set to exclude all signals.
• sigaddset
  • int sigaddset(sigset_t *set, int signum);
  • Adds the individual signal specified by signum to the signal set pointed to by set.
• kill
  • int kill(pid_t pid, int sig);
  • Sends the signal sig to the process specified by pid.

<unistd.h>

• write
  • ssize_t write(int fd, const void *buf, size_t count);
  • Writes up to count bytes from the buffer starting at buf to the file referred to by the file descriptor fd.
• access
  • int access(const char *pathname, int mode);
  • Checks the file named by pathname for accessibility according to the bit pattern contained in mode.
• read
  • ssize_t read(int fd, void *buf, size_t count);
  • Reads up to count bytes from file descriptor fd into the buffer starting at buf.
• close
  • int close(int fd);q
  • Closes the file descriptor fd.
• fork
  • pid_t fork(void);
  • Creates a new process by duplicating the calling process.

<readline/readline.h>

• readline
  • char *readline(const char *prompt);
  • Reads a line from the terminal with editing capabilities.
• rl_clear_history
  • void rl_clear_history(void);
  • Clears the history of lines read by readline.
• rl_on_new_line
  • int rl_on_new_line(void);
  • Resets the state to indicate that a new line of input is being read.
• rl_replace_line
  • int rl_replace_line(const char *text, int clear_undo);
  • Replaces the contents of the current line with text.
• rl_redisplay
  • int rl_redisplay(void);
  • Redisplays the current input line.
• add_history
  • void add_history(const char *line);
  • Adds the line to the history list.

<termios.h>

• tcsetattr
  • int tcsetattr(int fd, int optional_actions, const struct termios *termios_p);
  • Sets the parameters associated with the terminal referred to by fd.
• tcgetattr
  • int tcgetattr(int fd, struct termios *termios_p);
  • Gets the parameters associated with the terminal referred to by fd.

<term.h>

• tgetent
  • int tgetent(char *bp, const char *name);
  • Loads the entry for name from the termcap database.
• tgetflag
  • int tgetflag(const char *id);
  • Gets the boolean entry for id from the termcap database.
• tgetnum
  • int tgetnum(const char *id);
  • Gets the numeric entry for id from the termcap database.
• tgetstr
  • char *tgetstr(const char *id, char **area);
  • Gets the string entry for id from the termcap database.
• tgoto
  • char *tgoto(const char *cap, int col, int row);
  • Returns a cursor addressing string for the given capability cap.
• tputs
  • int tputs(const char *str, int affcnt, int (*putc)(int));
  • Outputs the string str with padding.