Module unistd 

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

Modules

alarm

Alarm signal scheduling.

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))

pause

Suspend the thread until a signal is received.

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