# POSIX

# Introduction

This module contains an interface to those functions defined in the IEEE 1003.1 (POSIX.1) standards document which are not accessible through other means.

Warning

Sensitive data can be retrieved with the POSIX functions, e.g. posix_getpwnam() and friends.

> Note: This extension is not available on Windows platforms.

- Installing/Configuring
  - Installation
- Predefined Constants
  - posix_access constants
  - posix_mknod constants
  - posix_setrlimit constants
  - posix_pathconf constants
  - posix_sysconf constants
- POSIX Functions
  - posix_access — Determine accessibility of a file
  - posix_ctermid — Get path name of controlling terminal
  - posix_eaccess — Determine accessibility of a file
  - posix_errno — Alias of posix_get_last_error
  - posix_fpathconf — Returns the value of a configurable limit
  - posix_get_last_error — Retrieve the error number set by the last posix function that failed
  - posix_getcwd — Pathname of current directory
  - posix_getegid — Return the effective group ID of the current process
  - posix_geteuid — Return the effective user ID of the current process
  - posix_getgid — Return the real group ID of the current process
  - posix_getgrgid — Return info about a group by group id
  - posix_getgrnam — Return info about a group by name
  - posix_getgroups — Return the group set of the current process
  - posix_getlogin — Return login name
  - posix_getpgid — Get process group id for job control
  - posix_getpgrp — Return the current process group identifier
  - posix_getpid — Return the current process identifier
  - posix_getppid — Return the parent process identifier
  - posix_getpwnam — Return info about a user by username
  - posix_getpwuid — Return info about a user by user id
  - posix_getrlimit — Return info about system resource limits
  - posix_getsid — Get the current sid of the process
  - posix_getuid — Return the real user ID of the current process
  - posix_initgroups — Calculate the group access list
  - posix_isatty — Determine if a file descriptor is an interactive terminal
  - posix_kill — Send a signal to a process
  - posix_mkfifo — Create a fifo special file (a named pipe)
  - posix_mknod — Create a special or ordinary file (POSIX.1)
  - posix_pathconf — Returns the value of a configurable limit
  - posix_setegid — Set the effective GID of the current process
  - posix_seteuid — Set the effective UID of the current process
  - posix_setgid — Set the GID of the current process
  - posix_setpgid — Set process group id for job control
  - posix_setrlimit — Set system resource limits
  - posix_setsid — Make the current process a session leader
  - posix_setuid — Set the UID of the current process
  - posix_strerror — Retrieve the system error message associated with the given errno
  - posix_sysconf — Returns system runtime information
  - posix_times — Get process times
  - posix_ttyname — Determine terminal device name
  - posix_uname — Get system name

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