Linux System API

The following is a list of Linux system calls that contain most of the common system calls and functions derived from system calls. This is probably the only list of Linux system calls you can see on the Internet, even if it's a simple alphabetical list, it's very rare to be able to do so completely.

By convention, this list is modelled on the Man Pages section 2nd, the System invocation section. According to the author's understanding, the general classification, but also made some minor changes, deleted a few for the kernel, not allow users to call the system calls, the individual I slightly feel inappropriate place made some minor changes, and all listed system calls attached a brief comment.

Some of these functions work exactly the same way, except for different parameters. (maybe a lot of familiar C + + friends can immediately associate with the function overload, but do not forget that the Linux core is written in C, so it can only be used for different function names). Some of the functions are obsolete, replaced by new better functions (GCC warns when linking these functions), but because of the reasons for compatibility, these functions will be marked with "*" on the front.

First, Process Control:

Fork	Create a new process
Clone	Create child processes by specified criteria
Execve	Run the executable file
Exit	Abort process
_exit	Abort Current process immediately
Getdtablesize	Maximum number of files that the process can open
Getpgid	Gets the specified process group identification number
Setpgid	Sets the specified process group flag number
Getpgrp	Gets the current process group identification number
Setpgrp	Set the current Process group flag number
Getpid	Get process identification number
Getppid	Gets the parent process identification number
GetPriority	Get scheduling priority
SetPriority	Set scheduling priority
Modify_ldt	Local description table for read and write processes
Nanosleep	Make process sleep Specify the time
Nice	Change the priority of the time-sharing process
Pause	Suspend process, wait for signal
Personality	Set process Run domain
Prctl	To perform specific actions on a process
Ptrace	Process tracking
Sched_get_priority_max	Get the upper limit of the static priority
Sched_get_priority_min	Get the lower bound of the static priority
Sched_getparam	Get scheduling parameters for a process
Sched_getscheduler	Gets the scheduling policy for the specified process
Sched_rr_get_interval	Get the time slice length of real-time process scheduled by RR algorithm
Sched_setparam	Set scheduling parameters for a process
Sched_setscheduler	To set scheduling policies and parameters for a specified process
Sched_yield	The process proactively yields the processor and waits for the queue to dispatch itself
Vfork	Create a sub-process for executing new programs, often with EXECVE, etc.
Wait	Wait for the child process to terminate
Wait3	See wait
Waitpid	Waits for the specified child process to terminate
Wait4	See Waitpid
Capget	Get Process Permissions
Capset	Set process Permissions
GetSID	Get a meeting identification number
Setsid	Set up meeting identification number

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Second, file system control 1, file read and write operation

Fcntl	File control
Open	Open File
creat	Create a new file
Close	Close File Description Word
Read	Read the file
Write	Write a file
Readv	Reading data from a file into a buffer array
Writev	Writes the data in the buffer array to the file
Pread	Random Read of files
Pwrite	Random Write to File
Lseek	Move file pointer
_llseek	Move the file pointer in the 64-bit address space
Dup	Copy an open file description word
Dup2	Copy a file description word by specified criteria
Flock	File Add/Unlock
Poll	I/o multi-channel conversion
Truncate	Truncate file
Ftruncate	See truncate
Umask	Set File Permission Mask
Fsync	Write the file back to disk in the memory section

2. File System operation

Access	Determining the accessibility of a file
ChDir	Change the current working directory
Fchdir	See ChDir
chmod	Change file Mode
Fchmod	See chmod
Chown	Change the owner or user group of a file
Fchown	See Chown
Lchown	See Chown
Chroot	Changing the root directory
Stat	Fetching File status information
Lstat	See Stat
Fstat	See Stat
Statfs	Fetching File System Information
Fstatfs	See Statfs
Readdir	Reading directory entries
Getdents	Reading directory entries
Mkdir	Create a Directory
Mknod	Create an index node
RmDir	Delete Directory
Rename	File renaming
Link	Create a link
Symlink	Creating Symbolic Links
Unlink	Delete link
Readlink	Read the value of a symbolic link
Mount	Installing the file system
Umount	Removing the file system
Ustat	Fetching File System Information
Utime	Change the file's access modification time
Utimes	See Utime
Quotactl	Controlling disk quotas

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Third, System control

Ioctl	I/O Total control function
_sysctl	Read/write system parameters
Acct	Enable or disable process accounting
Getrlimit	Get System Resource Cap
Setrlimit	Set System Resource Caps
Getrusage	Get System Resource Usage
Uselib	Select the binary library you want to use
Ioperm	Set Port I/O permissions
Iopl	Change the process I/O permission level
Outb	Low-level port operation
Reboot	Restart
Swapon	Open swap files and devices
Swapoff	Close swap files and devices
Bdflush	Controlling the Bdflush daemon
Sysfs	File system type supported by core
SysInfo	Get System Information
Adjtimex	Adjusting the system clock
Alarm	Set the alarm for a process
Getitimer	Get timer value
Setitimer	Set Timer value
Gettimeofday	Take time and time zone
Settimeofday	Set time and time zone
Stime	Set the system date and time
Time	Get system time
Times	Take process run time
Uname	Get information about the name, version, and host of the current UNIX system
Vhangup	Suspend current terminal
Nfsservctl	Controlling the NFS Daemon
Vm86	Enter analog 8086 mode
Create_module	To create a loadable module item
Delete_module	To delete a loadable module item
Init_module	Initializing the module
Query_module	Querying module information

Iv. Memory Management

Brk	Change the allocation of data segment space
Sbrk	See BRK
Mlock	Memory page Lock
Munlock	Memory Pages Unlocked
Mlockall	Call Process all memory page lock
Munlockall	Call Process all memory page unlocked
Mmap	Mapping Virtual Memory Pages
Munmap	removing memory page mappings
Mremap	Remap Virtual memory addresses
Msync	Write data from mapped memory back to disk
Mprotect	Set Memory image protection
GetPageSize	Get page size
Sync	Write memory buffer data back to the hard disk
Cacheflush	Writes the contents of the specified buffer back to disk

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Five, network management

Getdomainname	Take domain
Setdomainname	Set the domain name
Gethostid	Get host identification number
Sethostid	Set the host identification number
GetHostName	Get the host name
SetHostName	Set host name

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Six, Socket control

Socketcall	Socket system Call
Socket	Creating sockets
Bind	Bind socket to Port
Connect	Connecting to a remote host
Accept	Responding to a socket connection request
Send	Send message via socket
SendTo	Send UDP message
Sendmsg	See Send
Recv	Receiving information through the socket
Recvfrom	Receiving UDP information
Recvmsg	See recv
Listen	Monitor socket port
Select	Polling for multi-channel synchronous I/O
Shutdown	Close the connection on the socket
GetSockName	Get the local socket name
Getpeername	Get the socket name of the communication partner
GetSockOpt	Fetch Port Settings
SetSockOpt	Setting Port Parameters
Sendfile	Transferring data between files or ports
Socketpair	Create a pair of nameless sockets that have been joined

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VII. User Management

Getuid	Get the User ID number
Setuid	Set User flag number
Getgid	Get group identification number
Setgid	Set the group flag number
Getegid	Get Valid group identification number
Setegid	Set Valid group identification number
Geteuid	Get a valid user identification number
Seteuid	Set a valid user identification number
Setregid	Set a real and valid group identification number, respectively
Setreuid	Set a real and valid user identification number separately
Getresgid	Get real, valid, and saved group identification numbers, respectively
Setresgid	Set the actual, valid, and saved group identification numbers separately
Getresuid	Get real, valid, and saved user identification numbers, respectively
Setresuid	Set up real, valid, and saved user identification numbers, respectively
Setfsgid	Set the group identification number to use when setting up file system checks
Setfsuid	Set the user identification number used when file system checks
GetGroups	Get list of post-complement group flags
Setgroups	Set up post-complement Group flag list

VIII. Inter-process communication

Ipc	Inter-process communication total Control call

1. Signal

Sigaction	Set the processing method for the specified signal
Sigprocmask	Operation of blocking/unblocking of signals in signal set according to parameters
Sigpending	Sets the queue for the specified blocked signal
Sigsuspend	Suspend process waits for a specific signal
Signal	See Signal
Kill	Signaling to a process or process group
*sigblock	Adds a signal to the blocked signal mask that has been replaced by Sigprocmask
*siggetmask	Get an existing blocking signal mask that has been replaced by Sigprocmask
*sigsetmask	Replacing an existing blocking signal mask with a given signal mask, replaced by Sigprocmask
*sigmask	Converts a given signal to a mask that has been replaced by Sigprocmask
*sigpause	function with Sigsuspend, has been replaced by sigsuspend
Sigvec	For BSD-compliant signal processing functions, similar to Sigaction
Ssetmask	The signal processing function of ANSI C, acting like sigaction

2. Message

Msgctl	Message control operations
Msgget	Get Message Queuing
Msgsnd	Send Message
Msgrcv	Cancellation interest

3. Pipeline

Pipe	Creating pipelines

4. Signal Volume

Semctl	Signal Volume Control
Semget	Get a set of semaphores
Semop	Semaphore operation

5. Shared Memory

Shmctl	Controlling shared memory
Shmget	Get shared memory
Shmat	Connecting shared memory
Shmdt	removing shared memory

Resources

• Linux Mans pages
• Advanced programming in the UNIX environment, W. Richard Stevens, 1993

Linux System API