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POSIX Compatibility
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<h1>POSIX Compatibility List</h1>
<i>Version 0.1 (Draft), 2007/08/07</i><br><br>
<h3>File and Directories - <unistd.h></h3>
<table border="1" cellspacing="0">
<tbody>
<tr>
<th width="80">Name</th>
<th width="400">Synopsis</th>
<th>Description</th>
<th width="70">Support?</th>
</tr>
<tr>
<td>getcwd</td>
<td>char *getcwd(char *buf, size_t size);</td>
<td>get current working directory</td>
<td><img alt="Yes" height=15 width=20 src="img/checkmark.png"></td>
</tr>
<tr>
<td>mkdir</td>
<td>int mkdir(const char *pathname, mode_t mode);</td>
<td>create a directory</td>
<td><img alt="Yes" height=15 width=20 src="img/checkmark.png"></td>
</tr>
<tr>
<td>rmdir</td>
<td>int rmdir(const char *pathname);</td>
<td>delete a directory</td>
<td><img alt="Yes" height=15 width=20 src="img/checkmark.png"></td>
</tr>
<tr>
<td>chdir</td>
<td>int chdir(const char *path);</td>
<td>change working directory</td>
<td><img alt="Yes" height=15 width=20 src="img/checkmark.png"></td>
</tr>
<tr>
<td>link</td>
<td>int link(const char *oldpath, const char *newpath);</td>
<td>make a new name for a file</td>
<td>X</td>
</tr>
<tr>
<td>unlink</td>
<td>int unlink(const char *pathname);</td>
<td>delete a name and possibly the file it refers to</td>
<td><img alt="Yes" height=15 width=20 src="img/checkmark.png"></td>
</tr>
<tr>
<td>rename</td>
<td>int rename(const char *oldpath, const char *newpath);</td>
<td>change the name or location of a file</td>
<td><img alt="Yes" height=15 width=20 src="img/checkmark.png"></td>
</tr>
<tr>
<td>stat</td>
<td>int stat(const char *file_name, struct stat *buf);</td>
<td>get file status</td>
<td><img alt="Yes" height=15 width=20 src="img/checkmark.png"></td>
</tr>
<tr>
<td>chmod</td>
<td>int chmod(const char *path, mode_t mode);</td>
<td>change permissions of a file</td>
<td>No</td>
</tr>
<tr>
<td>chown</td>
<td>int chown(const char *path, uid_t owner, gid_t group);</td>
<td>change ownership of a file</td>
<td>No</td>
</tr>
<tr>
<td>utime</td>
<td>int utime(const char *filename, struct utimbuf *buf);</td>
<td>change access and/or modification times of an inode</td>
<td>X</td>
</tr>
<tr>
<td>opendir</td>
<td>DIR *opendir(const char *name);</td>
<td>open a directory</td>
<td><img alt="Yes" height=15 width=20 src="img/checkmark.png"></td>
</tr>
<tr>
<td>readdir</td>
<td>struct dirent *readdir(DIR *dir);</td>
<td>read directory entry</td>
<td><img alt="Yes" height=15 width=20 src="img/checkmark.png"></td>
</tr>
<tr>
<td>closedir</td>
<td>int closedir(DIR *dir);</td>
<td>close a directory</td>
<td><img alt="Yes" height=15 width=20 src="img/checkmark.png"></td>
</tr>
<tr>
<td>rewinddir</td>
<td>void rewinddir(DIR *dir);</td>
<td>reset directory stream</td>
<td><img alt="Yes" height=15 width=20 src="img/checkmark.png"></td>
</tr>
</tbody>
</table>
<h3>Advanced File Operations - <unistd.h></h3>
<table border="1" cellspacing="0">
<tbody>
<tr>
<th width="80">Name</th>
<th width="400">Synopsis</th>
<th>Description</th>
<th width="70">Support?</th>
</tr>
<tr>
<td>access</td>
<td>int access(const char *pathname, int mode);</td>
<td>check user's permissions for a file</td>
<td><img alt="Yes" height=15 width=20 src="img/checkmark.png"></td>
</tr>
<tr>
<td>open</td>
<td>int open(const char *pathname, int flags);</td>
<td>open and possibly create a file or device</td>
<td><img alt="Yes" height=15 width=20 src="img/checkmark.png"></td>
</tr>
<tr>
<td>creat</td>
<td>int creat(const char *pathname, mode_t mode);</td>
<td>open and possibly create a file or device</td>
<td><img alt="Yes" height=15 width=20 src="img/checkmark.png"></td>
</tr>
<tr>
<td>close</td>
<td>int close(int fd);</td>
<td>close a file descriptor</td>
<td><img alt="Yes" height=15 width=20 src="img/checkmark.png"></td>
</tr>
<tr>
<td>read</td>
<td>ssize_t read(int fd, void *buf, size_t count);</td>
<td>read from a file descriptor</td>
<td><img alt="Yes" height=15 width=20 src="img/checkmark.png"></td>
</tr>
<tr>
<td>write</td>
<td>ssize_t write(int fd, const void *buf, size_t count);</td>
<td>write to a file descriptor</td>
<td><img alt="Yes" height=15 width=20 src="img/checkmark.png"></td>
</tr>
<tr>
<td>fcntl</td>
<td>int fcntl(int fd, int cmd);</td>
<td>manipulate file descriptor</td>
<td>X</td>
</tr>
<tr>
<td>fstat</td>
<td>int fstat(int filedes, struct stat *buf);</td>
<td>get file status</td>
<td><img alt="Yes" height=15 width=20 src="img/checkmark.png"></td>
</tr>
<tr>
<td>lseek</td>
<td>off_t lseek(int fildes, off_t offset, int whence);</td>
<td>reposition read/write file offset</td>
<td><img alt="Yes" height=15 width=20 src="img/checkmark.png"></td>
</tr>
<tr>
<td>dup</td>
<td>int dup(int oldfd);</td>
<td>duplicate a file descriptor</td>
<td><img alt="Yes" height=15 width=20 src="img/checkmark.png"></td>
</tr>
<tr>
<td>dup2</td>
<td>int dup2(int oldfd, int newfd);</td>
<td>duplicate a file descriptor</td>
<td><img alt="Yes" height=15 width=20 src="img/checkmark.png"></td>
</tr>
<tr>
<td>pipe</td>
<td>int pipe(int filedes[2]);</td>
<td>create pipe</td>
<td>X</td>
</tr>
<tr>
<td>mkfifo</td>
<td>int mkfifo(const char *pathname, mode_t mode);</td>
<td>make a FIFO special file (a named pipe)</td>
<td>X</td>
</tr>
<tr>
<td>umask</td>
<td>mode_t umask(mode_t mask);</td>
<td>set file creation mask</td>
<td>Not Support</td>
</tr>
<tr>
<td>fdopen</td>
<td>FILE *fdopen(int fildes, const char *mode);</td>
<td>associate a stream with an existing file descriptor</td>
<td><img alt="Yes" height=15 width=20 src="img/checkmark.png"></td>
</tr>
<tr>
<td>fileno</td>
<td>int fileno(FILE *stream);</td>
<td>return file descriptor of stream</td>
<td><img alt="Yes" height=15 width=20 src="img/checkmark.png"></td>
</tr>
</tbody>
</table>
<h3>Processes - <unistd.h></h3>
<table border="1" cellspacing="0">
<tbody>
<tr>
<th width="80">Name</th>
<th width="400">Synopsis</th>
<th>Description</th>
<th width="70">Support?</th>
</tr>
<tr>
<td>fork</td>
<td>pid_t fork(void);</td>
<td>create a child process</td>
<td><img alt="Yes" height=15 width=20 src="img/checkmark.png"></td>
</tr>
<tr>
<td>execl</td>
<td>int execl(const char *path, const char *arg, ...);</td>
<td>execute a file</td>
<td>X</td>
</tr>
<tr>
<td>execle</td>
<td>int execle(const char *path, const char *arg, ...)</td>
<td>execute a file</td>
<td>X</td>
</tr>
<tr>
<td>execlp</td>
<td>int execlp(const char *file, const char *arg, ...);</td>
<td>execute a file</td>
<td>X</td>
</tr>
<tr>
<td>execv</td>
<td>int execv(const char *path, char *const argv[]);</td>
<td>execute a file</td>
<td>X</td>
</tr>
<tr>
<td>execve</td>
<td>int execve(const char *path, char *const argv[], char *const envp[]))</td>
<td>execute program</td>
<td><img alt="Yes" height=15 width=20 src="img/checkmark.png"></td>
</tr>
<tr>
<td>execvp</td>
<td>int execvp(const char *file, char *const argv[]);</td>
<td>execute a file</td>
<td>X</td>
</tr>
<tr>
<td>wait</td>
<td>pid_t wait(int *status);</td>
<td>wait for process termination</td>
<td><img alt="Yes" height=15 width=20 src="img/checkmark.png"></td>
</tr>
<tr>
<td>waitpid</td>
<td>pid_t waitpid(pid_t pid, int *status, int options);</td>
<td>wait for process termination</td>
<td><img alt="Yes" height=15 width=20 src="img/checkmark.png"></td>
</tr>
<tr>
<td>_exit</td>
<td>void _exit(int status);</td>
<td>terminate the current process</td>
<td><img alt="Yes" height=15 width=20 src="img/checkmark.png"></td>
</tr>
<tr>
<td>kill</td>
<td>int kill(pid_t pid, int sig);</td>
<td>send signal to a process</td>
<td><img alt="Yes" height=15 width=20 src="img/checkmark.png"></td>
</tr>
<tr>
<td>sleep</td>
<td>unsigned int sleep(unsigned int seconds);</td>
<td>Sleep for the specified number of seconds</td>
<td><img alt="Yes" height=15 width=20 src="img/checkmark.png"></td>
</tr>
<tr>
<td>pause</td>
<td>int pause(void);</td>
<td>wait for signal</td>
<td><img alt="Yes" height=15 width=20 src="img/checkmark.png"></td>
</tr>
<tr>
<td>alarm</td>
<td>unsigned int alarm(unsigned int seconds);</td>
<td>set an alarm clock for delivery of a signal</td>
<td><img alt="Yes" height=15 width=20 src="img/checkmark.png"></td>
</tr>
<tr>
<td>setuid</td>
<td>int setuid(uid_t uid);</td>
<td>set user identity</td>
<td>Limited Support</td>
</tr>
<tr>
<td>setgid</td>
<td>int setgid(gid_t gid);</td>
<td>set group identity</td>
<td>Limited Support</td>
</tr>
</tbody>
</table>
<h3>Long Jumps - <setjmp.h></h3>
<table border="1" cellspacing="0">
<tbody>
<tr>
<th width="80">Name</th>
<th width="400">Synopsis</th>
<th>Description</th>
<th width="70">Support?</th>
</tr>
<tr>
<td>setjmp</td>
<td>int setjmp(jmp_buf env);</td>
<td>save stack context for non-local goto</td>
<td><img alt="Yes" height=15 width=20 src="img/checkmark.png"></td>
</tr>
<tr>
<td>sigsetjmp</td>
<td>int sigsetjmp(sigjmp_buf env, int savesigs);</td>
<td>save stack context for non-local goto</td>
<td>X</td>
</tr>
<tr>
<td>longjmp</td>
<td>void longjmp(jmp_buf env, int val);</td>
<td>non-local jump to a saved stack context</td>
<td><img alt="Yes" height=15 width=20 src="img/checkmark.png"></td>
</tr>
<tr>
<td>siglongjmp</td>
<td>void siglongjmp(sigjmp_buf env, int val);</td>
<td>non-local jump to a saved stack context</td>
<td>X</td>
</tr>
</tbody>
</table>
<h3>Signal Handling - <signal.h></h3>
<table border="1" cellspacing="0">
<tbody>
<tr>
<th width="80">Name</th>
<th width="400">Synopsis</th>
<th>Description</th>
<th width="70">Support?</th>
</tr>
<tr>
<td>sigaction</td>
<td>int sigaction(int sig, const struct sigaction *act, struct sigaction *oldact);</td>
<td>examine and change signal action</td>
<td><img alt="Yes" height=15 width=20 src="img/checkmark.png"></td>
</tr>
<tr>
<td>sigemptyset</td>
<td>int sigemptyset(sigset_t *set);</td>
<td>create an empty signal set</td>
<td>X</td>
</tr>
<tr>
<td>sigfillset</td>
<td>int sigfillset(sigset_t *set);</td>
<td>create a full set of signals</td>
<td>X</td>
</tr>
<tr>
<td>sigaddset</td>
<td>int sigaddset(sigset_t *set, int signum);</td>
<td>add a signal to a signal set</td>
<td>X</td>
</tr>
<tr>
<td>sigdelset</td>
<td>int sigdelset(sigset_t *set, int signum);</td>
<td>remove a signal from a signal set</td>
<td>X</td>
</tr>
<tr>
<td>sigismember</td>
<td>int sigismember(const sigset_t *set, int signum);</td>
<td>test a signal set for a selected member</td>
<td>X</td>
</tr>
<tr>
<td>sigprocmask</td>
<td>int sigprocmask(int how, const sigset_t *set, sigset_t *oset);</td>
<td>examine and change blocked signals</td>
<td><img alt="Yes" height=15 width=20 src="img/checkmark.png"></td>
</tr>
<tr>
<td>sigpending</td>
<td>int sigpending(sigset_t *set);</td>
<td>examine pending signals</td>
<td><img alt="Yes" height=15 width=20 src="img/checkmark.png"></td>
</tr>
<tr>
<td>sigsuspend</td>
<td>int sigsuspend(const sigset_t *mask);</td>
<td>wait for a signal </td>
<td><img alt="Yes" height=15 width=20 src="img/checkmark.png"></td>
</tr>
</tbody>
</table>
<h3>Obtaining Information at Runtime - <unistd.h><pwd.h><grp.h></h3>
<table border="1" cellspacing="0">
<tbody>
<tr>
<th width="80">Name</th>
<th width="400">Synopsis</th>
<th>Description</th>
<th width="70">Support?</th>
</tr>
<tr>
<td>getpid</td>
<td>pid_t getpid(void);</td>
<td>get process identification</td>
<td><img alt="Yes" height=15 width=20 src="img/checkmark.png"></td>
</tr>
<tr>
<td>getppid</td>
<td>pid_t getppid(void);</td>
<td>get parent process identification</td>
<td><img alt="Yes" height=15 width=20 src="img/checkmark.png"></td>
</tr>
<tr>
<td>getlogin</td>
<td>char * getlogin(void);</td>
<td>get user name</td>
<td>X</td>
</tr>
<tr>
<td>getuid</td>
<td>uid_t getuid(void);</td>
<td>get user identity</td>
<td>Limited Support</td>
</tr>
<tr>
<td>geteuid</td>
<td>uid_t geteuid(void);</td>
<td>get effective user identity</td>
<td>Limited Support</td>
</tr>
<tr>
<td>cuserrid</td>
<td>char * cuserid(char *string);</td>
<td>get user name</td>
<td>X</td>
</tr>
<tr>
<td>getgid</td>
<td>gid_t getgid(void);</td>
<td>get group identity</td>
<td>Limited Support</td>
</tr>
<tr>
<td>getegid</td>
<td>gid_t getegid(void);</td>
<td>get effective group identity</td>
<td>Limited Support</td>
</tr>
<tr>
<td>getpwuid</td>
<td>struct passwd *getpwuid(uid_t uid);</td>
<td>get password file entry based on user id</td>
<td>X</td>
</tr>
<tr>
<td>getpwnam</td>
<td>struct passwd *getpwnam(const char * name);</td>
<td>get password file entry based on user name</td>
<td>X</td>
</tr>
<tr>
<td>getgrgid</td>
<td>struct group *getgrgid(gid_t gid);</td>
<td>get group file entry based on group id</td>
<td>X</td>
</tr>
<tr>
<td>getgrnam</td>
<td>struct group *getgrnam(const char *name);</td>
<td>get group file entry baes on group name</td>
<td>X</td>
</tr>
<tr>
<td>getgroups</td>
<td>int getgroups(int size, gid_t list[]);</td>
<td>get list of supplementary group IDs</td>
<td>X</td>
</tr>
<tr>
<td>ctermid</td>
<td>char *ctermid(char *s);</td>
<td>get controlling terminal name</td>
<td>X</td>
</tr>
<tr>
<td>uname</td>
<td>int uname(struct utsname *buf);</td>
<td>get name and information about current kernel</td>
<td><img alt="Yes" height=15 width=20 src="img/checkmark.png"></td>
</tr>
<tr>
<td>getenv</td>
<td>char *getenv(const char *name);</td>
<td>get an environment variable</td>
<td>X</td>
</tr>
<tr>
<td>sysconf</td>
<td>long sysconf(int name);</td>
<td>get configuration information at runtime</td>
<td>X</td>
</tr>
<tr>
<td>fpathconf</td>
<td>long fpathconf(int filedes, int name);</td>
<td>get configuration values for files</td>
<td>X</td>
</tr>
<tr>
<td>isatty</td>
<td>int isatty(int desc);</td>
<td>does this descriptor refer to a terminal</td>
<td>X</td>
</tr>
<tr>
<td>ttyname</td>
<td>char *ttyname(int desc);</td>
<td>return name of a terminal</td>
<td>X</td>
</tr>
<tr>
<td>times</td>
<td>clock_t times(struct tms *buf);</td>
<td>get process times</td>
<td>X</td>
</tr>
<tr>
<td>tzset</td>
<td>void tzset(void);</td>
<td>initialize time conversion information </td>
<td>X</td>
</tr>
</tbody>
</table>
<h3>Terminal I/O - <termios.h></h3>
<table border="1" cellspacing="0">
<tbody>
<tr>
<th width="80">Name</th>
<th width="400">Synopsis</th>
<th>Description</th>
<th width="70">Support?</th>
</tr>
<tr>
<td>getpid</td>
<td>pid_t getpid(void);</td>
<td>get process identification</td>
<td>X</td>
</tr>
<tr>
<td>tcgetattr</td>
<td>int tcgetattr(int fd, struct termios *termios_p);</td>
<td>get terminal attributes</td>
<td>X</td>
</tr>
<tr>
<td>tcsetattr</td>
<td>int tcsetattr(int fd, int optional_actions, struct termios *termios_p);</td>
<td>set terminal attributes</td>
<td>X</td>
</tr>
<tr>
<td>tcdrain</td>
<td>int tcdrain(int fd);</td>
<td>wait for all output to be transmitted to the terminal</td>
<td>X</td>
</tr>
<tr>
<td>tcflow</td>
<td>int tcflow(int fd, int action);</td>
<td>suspend/restart terminal output</td>
<td>X</td>
</tr>
<tr>
<td>tcflush</td>
<td>int tcflush(int fd, int queue_selector);</td>
<td>discard terminal data</td>
<td>X</td>
</tr>
<tr>
<td>tcsendbreak</td>
<td>int tcsendbreak(int fd, int duration);</td>
<td>send a break to a terminal</td>
<td>X</td>
</tr>
<tr>
<td>cfgetispeed</td>
<td>speed_t cfgetispeed(struct termios *termios_p);</td>
<td>get input baud rate</td>
<td>X</td>
</tr>
<tr>
<td>cfgetospeed</td>
<td>speed_t cfgetospeed(struct termios *termios_p);</td>
<td>get output baud rate</td>
<td>X</td>
</tr>
<tr>
<td>cfsetispeed</td>
<td>int cfsetispeed(struct termios *termios_p, speed_t speed);</td>
<td>set input baud rate</td>
<td>X</td>
</tr>
<tr>
<td>cfsetospeed</td>
<td>speed_t cfsetospeed(const struct termios *termios_p);</td>
<td>set output baud rate</td>
<td>X</td>
</tr>
<tr>
<td>tcgetpgrp</td>
<td>pid_t tcgetpgrp(int fd);</td>
<td>get terminal foreground process group ID</td>
<td>X</td>
</tr>
<tr>
<td>tcsetpgrp</td>
<td>int tcsetpgrp(int fd, pid_t pgrpid);</td>
<td>set terminal foreground process group ID</td>
<td><img alt="Yes" height=15 width=20 src="img/checkmark.png"></td>
</tr>
</tbody>
</table>
<h3>Process Groups and Job Control - <unistd.h></h3>
<table border="1" cellspacing="0">
<tbody>
<tr>
<th width="80">Name</th>
<th width="400">Synopsis</th>
<th>Description</th>
<th width="70">Support?</th>
</tr>
<tr>
<td>setsid</td>
<td>pid_t setsid(void);</td>
<td>creates a session and sets the process group ID</td>
<td>X</td>
</tr>
<tr>
<td>setpgid</td>
<td>int setpgid(pid_t pid, pid_t pgid);</td>
<td>set process group</td>
<td><img alt="Yes" height=15 width=20 src="img/checkmark.png"></td>
</tr>
<tr>
<td>getpgrp</td>
<td>pid_t getpgrp(void);</td>
<td>get process group </td>
<td><img alt="Yes" height=15 width=20 src="img/checkmark.png"></td>
</tr>
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