Module unistd

Safe wrappers around functions found in libc “unistd.h” header

Structs

• AccessFlags
  Options for access()
• Gid
  Group identifier
• Group
  Representation of a Group, based on libc::group
• Pid
  Process identifier
• ResGid
  Real, effective and saved group IDs.
• ResUid
  Real, effective and saved user IDs.
• Uid
  User identifier
• User
  Representation of a User, based on libc::passwd

Enums

• ForkResult
  Represents the successful result of calling fork
• PathconfVar
  Variable names for pathconf
• SysconfVar
  Variable names for sysconf
• UnlinkatFlags
  Flags for unlinkat function.
• Whence
  Directive that tells lseek and lseek64 what the offset is relative to.

Constants

• ROOT
  Constant for UID = 0

Functions

• access
  Checks the file named by path for accessibility according to the flags given by amode See access(2)
• chdir
  Change the current working directory of the calling process (see chdir(2)).
• chown
  Change the ownership of the file at path to be owned by the specified owner (user) and group (see chown(2)).
• chroot
  Change a process’s root directory
• close
  Close a raw file descriptor
• daemon
  Daemonize this process by detaching from the controlling terminal (see daemon(3)).
• dup
  Create a copy of the specified file descriptor (see dup(2)).
• dup2
  Create a copy of the specified file descriptor using the specified fd (see dup(2)).
• dup3
  Create a new copy of the specified file descriptor using the specified fd and flags (see dup(2)).
• eaccess
  Checks the file named by path for accessibility according to the flags given by mode using effective UID, effective GID and supplementary group lists.
• execv
  Replace the current process image with a new one (see exec(3)).
• execve
  Replace the current process image with a new one (see execve(2)).
• execveat
  Execute program relative to a directory file descriptor (see execveat(2)).
• execvp
  Replace the current process image with a new one and replicate shell PATH searching behavior (see exec(3)).
• execvpe
  Replace the current process image with a new one and replicate shell PATH searching behavior (see execvpe(3)).
• faccessat
  Checks the file named by path for accessibility according to the flags given by mode
• fchdir
  Change the current working directory of the process to the one given as an open file descriptor (see fchdir(2)).
• fchown
  Change the ownership of the file referred to by the open file descriptor fd to be owned by the specified owner (user) and group (see fchown(2)).
• fchownat
  Change the ownership of the file at path to be owned by the specified owner (user) and group.
• fdatasync
  Synchronize the data of a file
• fexecve
  Replace the current process image with a new one (see fexecve(2)).
• fork^⚠
  Create a new child process duplicating the parent process (see fork(2)).
• fpathconf
  Like pathconf, but works with file descriptors instead of paths (see fpathconf(2))
• fsync
  Synchronize changes to a file
• ftruncate
  Truncate a file to a specified length
• getcwd
  Returns the current directory as a PathBuf
• getegid
  Get the effective group ID
• geteuid
  Get the effective user ID
• getgid
  Get the real group ID
• getgrouplist
  Calculate the supplementary group access list.
• getgroups
  Get the list of supplementary group IDs of the calling process.
• getpgid
  Get process group
• getpgrp
  Get the group id of the calling process (see getpgrp(3)).
• getpid
  Get the pid of this process (see getpid(2)).
• getppid
  Get the pid of this processes’ parent (see getpid(2)).
• getresgid
  Gets the real, effective, and saved group IDs.
• getresuid
  Gets the real, effective, and saved user IDs.
• getsid
  Get the process group ID of a session leader getsid(2).
• gettid
  Get the caller’s thread ID (see gettid(2).
• getuid
  Get a real user ID
• initgroups
  Initialize the supplementary group access list.
• isatty
  Determines if the file descriptor refers to a valid terminal type device.
• linkat
  Link one file to another file
• lseek
  Move the read/write file offset.
• lseek64
  Move the read/write file offset.
• mkdir
  Creates new directory path with access rights mode. (see mkdir(2))
• mkdtemp
  Creates a directory which persists even after process termination
• mkfifo
  Creates new fifo special file (named pipe) with path path and access rights mode.
• mkfifoat
  Creates new fifo special file (named pipe) with path path and access rights mode.
• mkstemp
  Creates a regular file which persists even after process termination
• pathconf
  Get path-dependent configurable system variables (see pathconf(2))
• pipe
  Create an interprocess channel.
• pipe2
  Like pipe, but allows setting certain file descriptor flags.
• pivot_root
  Change the root file system.
• read
  Read from a raw file descriptor.
• setegid
  Set the effective group ID
• seteuid
  Set the effective user ID
• setfsgid
  Set the group identity used for filesystem checks per-thread. On both success and failure, this call returns the previous filesystem group ID of the caller.
• setfsuid
  Set the user identity used for filesystem checks per-thread. On both success and failure, this call returns the previous filesystem user ID of the caller.
• setgid
  Set the group ID
• setgroups
  Set the list of supplementary group IDs for the calling process.
• setpgid
  Set a process group ID (see setpgid(2)).
• setresgid
  Sets the real, effective, and saved gid. (see setresuid(2))
• setresuid
  Sets the real, effective, and saved uid. (see setresuid(2))
• setsid
  Create new session and set process group id (see setsid(2)).
• setuid
  Set the user ID
• sleep
  Suspend execution for an interval of time
• symlinkat
  Creates a symbolic link at path2 which points to path1.
• sync
  Commit filesystem caches to disk
• syncfs
  Commit filesystem caches containing file referred to by the open file descriptor fd to disk
• sysconf
  Get configurable system variables (see sysconf(3))
• truncate
  Truncate a file to a specified length
• unlink
  Remove a directory entry
• unlinkat
  Remove a directory entry
• write
  Write to a raw file descriptor.

Type Aliases

• FchownatFlags
• LinkatFlags