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Linux Documentation > Manual Pages > System Calls
- _exit, _Exit - terminate the current process
- accept - accept a connection on a socket
- access - check user's permissions for a file
- acct - switch process accounting on or off
- adjtimex - tune kernel clock
- alarm - set an alarm clock for delivery of a signal
- alloc_hugepages, free_hugepages - allocate or free huge pages
- arch_prctl - set architecture specific thread state
- bdflush - start, flush, or tune buffer-dirty-flush daemon
- bind - bind a name to a socket
- brk, sbrk - change data segment size
- cacheflush - flush contents of instruction and/or data cache
- capget, capset - set/get process capabilities
- chdir, fchdir - change working directory
- chmod, fchmod - change permissions of a file
- chown, fchown, lchown - change ownership of a file
- chroot - change root directory
- clone - create a child process
- close - close a file descriptor
- connect - initiate a connection on a socket
- dup, dup2 - duplicate a file descriptor
- epoll_create - open an epoll file descriptor
- epoll_ctl - control interface for an epoll descriptor
- epoll_wait - wait for an I/O event on an epoll file descriptor
- execve - execute program
- fcntl - manipulate file descriptor
- fdatasync - synchronize a file's in-core data with that on disk
- flock - apply or remove an advisory lock on an open file
- fork - create a child process
- fsync, fdatasync - synchronize a file's complete in-core state with that on disk
- futex - Fast Userspace Locking system call
- get_thread_area - Get a Thread Local Storage (TLS) area
- getcontext, setcontext - get or set the user context
- getdents - get directory entries
- getdomainname, setdomainname - get/set domain name
- getdtablesize - get descriptor table size
- getgid, getegid - get group identity
- getgroups, setgroups - get/set list of supplementary group IDs
- gethostid, sethostid - get or set the unique identifier of the current host
- gethostname, sethostname - get/set host name
- getitimer, setitimer - get or set value of an interval timer
- getpagesize - get memory page size
- getpeername - get name of connected peer socket
- getpid, getppid - get process identification
- getpriority, setpriority - get/set program scheduling priority
- getresuid, getresgid - get real, effective and saved user or group ID
- getrlimit, getrusage, setrlimit - get/set resource limits and usage
- getsid - get session ID
- getsockname - get socket name
- getsockopt, setsockopt - get and set options on sockets
- gettid - get thread identification
- gettimeofday, settimeofday - get / set time
- getuid, geteuid - get user identity
- getxattr, lgetxattr, fgetxattr - retrieve an extended attribute value
- idle - make process 0 idle
- intro, _syscall - Introduction to system calls
- io_cancel - Cancel an outstanding asynchronous I/O operation
- io_destroy - Destroy an asynchronous I/O context
- io_getevents - Read asynchronous I/O events from the completion queue
- io_setup - Create an asynchronous I/O context
- io_submit - Submit asynchronous I/O blocks for processing
- ioctl - control device
- ioctl_list - list of ioctl calls in Linux/i386 kernel
- ioperm - set port input/output permissions
- iopl - change I/O privilege level
- ipc - System V IPC system calls
- kill - send signal to a process
- killpg - send signal to a process group
- link - make a new name for a file
- listen - listen for connections on a socket
- listxattr, llistxattr, flistxattr - list extended attribute names
- _llseek - reposition read/write file offset
- lookup_dcookie - return a directory entry's path
- lseek - reposition read/write file offset
- madvise - give advice about use of memory
- mincore - get information on whether pages are in core
- mkdir - create a directory
- mknod - create a special or ordinary file
- mlock - disable paging for some parts of memory
- mlockall - disable paging for calling process
- mmap, munmap - map or unmap files or devices into memory
- mmap2 - map files or devices into memory
- modify_ldt - get or set ldt
- mount, umount - mount and unmount filesystems
- mprotect - control allowable accesses to a region of memory
- mremap - re-map a virtual memory address
- msgctl - message control operations
- msgget - get a message queue identifier
- msgop - message operations
- msync - synchronize a file with a memory map
- munlock - reenable paging for some parts of memory
- munlockall - reenable paging for calling process
- nanosleep - pause execution for a specified time
- nfsservctl - syscall interface to kernel nfs daemon
- nice - change process priority
- oldfstat, oldlstat, oldstat, oldolduname, olduname - obsolete system calls
- open, creat - open and possibly create a file or device
- outb, outw, outl, outsb, outsw, outsl, - inb, inw, inl, insb, insw, insl,
outb_p, outw_p, outl_p, inb_p, inw_p, inl_p
port I/O
- pause - wait for signal
- pciconfig_read, pciconfig_write, pciconfig_iobase - pci device information handling
- personality - set the process execution domain
- pipe - create pipe
- pivot_root - change the root file system
- poll - wait for some event on a file descriptor
- posix_fadvise - predeclare an access pattern for file data
- prctl - operations on a process
- pread, pwrite - read from or write to a file descriptor at a given offset
- ptrace - process trace
- quotactl - manipulate disk quotas
- read - read from a file descriptor
- readahead - Read in advance one or more pages of a file within a page cache
- readdir - read directory entry
- readlink - read value of a symbolic link
- readv, writev - read or write data into multiple buffers
- reboot - reboot or enable/disable Ctrl-Alt-Del
- recv, recvfrom, recvmsg - receive a message from a socket
- remap_file_pages - create a non-linear file mapping
- removexattr, lremovexattr, fremovexattr - remove an extended attribute
- rename - change the name or location of a file
- rmdir - delete a directory
- sched_get_priority_max, sched_get_priority_min - get static priority range
- sched_rr_get_interval - get the SCHED_RR interval for the named process
- sched_setaffinity, sched_getaffinity - set and get a process's CPU affinity
- sched_setparam, sched_getparam - set and get scheduling parameters
- sched_setscheduler, sched_getscheduler - set and get scheduling algorithm/parameters
- sched_yield - yield the processor
- select, pselect, FD_CLR, FD_ISSET, FD_SET, FD_ZERO - synchronous I/O multiplexing
- select, pselect, FD_CLR, FD_ISSET, FD_SET, FD_ZERO - synchronous I/O multiplexing
- semctl - semaphore control operations
- semget - get a semaphore set identifier
- semop, semtimedop - semaphore operations
- send, sendto, sendmsg - send a message from a socket
- sendfile - transfer data between file descriptors
- set_thread_area - Set a Thread Local Storage (TLS) area
- seteuid, setegid - set effective user or group ID
- setfsgid - set group identity used for file system checks
- setfsuid - set user identity used for file system checks
- setgid - set group identity
- setpgid, getpgid, setpgrp, getpgrp - set/get process group
- setresuid, setresgid - set real, effective and saved user or group ID
- setreuid, setregid - set real and/or effective user or group ID
- setsid - creates a session and sets the process group ID
- setuid - set user identity
- setup - setup devices and file systems, mount root file system
- setxattr, lsetxattr, fsetxattr - set an extended attribute value
- shmctl - shared memory control
- shmget - allocates a shared memory segment
- shmop - shared memory operations
- shutdown - shut down part of a full-duplex connection
- sigaction, sigprocmask, sigpending, sigsuspend - POSIX signal handling functions
- sigaltstack - set and/or get signal stack context
- sigblock, siggetmask, sigsetmask, sigmask - manipulate the signal mask
- signal - ANSI C signal handling
- sigpause - atomically release blocked signals and wait for interrupt
- sigqueue - queue a signal and data to a process
- sigreturn - return from signal handler and cleanup stack frame
- sigvec - BSD software signal facilities
- sigwaitinfo, sigtimedwait - synchronously wait for queued signals
- socket - create an endpoint for communication
- socketcall - socket system calls
- socketpair - create a pair of connected sockets
- sstk - change stack size
- stat, fstat, lstat - get file status
- statfs, fstatfs - get file system statistics
- statvfs, fstatvfs - get file system statistics
- stime - set time
- swapon, swapoff - start/stop swapping to file/device
- symlink - make a new name for a file
- sync - commit buffer cache to disk
- syscall - indirect system call
- none - list of all system calls
- sysctl - read/write system parameters
- sysfs - get file system type information
- sysinfo - returns information on overall system statistics
- syslog, klogctl - read and/or clear kernel message ring buffer; set console_loglevel
- time - get time in seconds
- times - get process times
- tkill - send a signal to a single process
- truncate, ftruncate - truncate a file to a specified length
- umask - set file creation mask
- uname - get name and information about current kernel
- exit_group, - madvise1,
rt_sigaction,
rt_sigpending,
rt_sigprocmask,
rt_sigqueueinfo,
rt_sigreturn,
rt_sigsuspend,
rt_sigtimedwait,
ugetrlimit
undocumented system calls
- afs_syscall, break, ftime, getpmsg, gtty, lock, mpx, prof, profil, - putpmsg, security, stty, ulimit
unimplemented system calls
- unlink - delete a name and possibly the file it refers to
- uselib - select shared library
- ustat - get file system statistics
- utime, utimes - change access and/or modification times of an inode
- vfork - create a child process and block parent
- vhangup - virtually hangup the current tty
- vm86old, vm86 - enter virtual 8086 mode
- wait, waitpid - wait for process termination
- wait3, wait4 - wait for process termination, BSD style
- write - write to a file descriptor
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