Linux System Calls Details

Linux System Calls Details

No	Function Name	Description	Source
1	exit	terminate the current process	kernel/exit.c
2	fork	create a child process	arch/i386/kernel/process.c
3	read	read from a file descriptor	fs/read_write.c
4	write	write to a file descriptor	fs/read_write.c
5	open	open a file or device	fs/open.c
6	close	close a file descriptor	fs/open.c
7	waitpid	wait for process termination	kernel/exit.c
8	creat	create a file or device	fs/open.c
9	link	make a new name for a file	fs/namei.c
10	unlink	delete a name and possibly the file it refers to	fs/namei.c
11	execve	execute program	arch/i386/kernel/process.c
12	chdir	change working directory	fs/open.c
13	time	get time in seconds	kernel/time.c
14	mknod	create a special or ordinary file	fs/namei.c
15	chmod	change permissions of a file	fs/open.c
16	lchown	change ownership of a file	fs/open.c
18	stat	get file status	fs/stat.c
19	lseek	reposition read/write file offset	fs/read_write.c
20	getpid	get process identification	kernel/sched.c
21	mount	mount filesystems	fs/super.c
22	umount	unmount filesystems	fs/super.c
23	setuid	set real user ID	kernel/sys.c
24	getuid	get real user ID	kernel/sched.c
25	stime	set system time and date	kernel/time.c
26	ptrace	allows a parent process to control the execution of a child process	arch/i386/kernel/ptrace.c
27	alarm	set an alarm clock for delivery of a signal	kernel/sched.c
28	fstat	get file status	fs/stat.c
29	pause	suspend process until signal	arch/i386/kernel/sys_i386.c
30	utime	set file access and modification times	fs/open.c
33	access	check user's permissions for a file	fs/open.c
34	nice	change process priority	kernel/sched.c

36	sync	update the super block	fs/buffer.c
37	kill	send signal to a process	kernel/signal.c
38	rename	change the name or location of a file	fs/namei.c
39	mkdir	create a directory	fs/namei.c
40	rmdir	remove a directory	fs/namei.c
41	dup	duplicate an open file descriptor	fs/fcntl.c
42	pipe	create an interprocess channel	arch/i386/kernel/sys_i386.c
43	times	get process times	kernel/sys.c
45	brk	change the amount of space allocated for the calling process's data segment	mm/mmap.c`
46	setgid	set real group ID	kernel/sys.c
47	getgid	get real group ID	kernel/sched.c
48	sys_signal	ANSI C signal handling	kernel/signal.c
49	geteuid	get effective user ID	kernel/sched.c
50	getegid	get effective group ID	kernel/sched.c
51	acct	enable or disable process accounting	kernel/acct.c
52	umount2	unmount a file system	fs/super.c
54	ioctl	control device	fs/ioctl.c
55	fcntl	file control	fs/fcntl.c
56	mpx	(unimplemented)
57	setpgid	set process group ID	kernel/sys.c
58	ulimit	(unimplemented)
59	olduname	obsolete uname system call	arch/i386/kernel/sys_i386.c
60	umask	set file creation mask	kernel/sys.c
61	chroot	change root directory	fs/open.c
62	ustat	get file system statistics	fs/super.c
63	dup2	duplicate a file descriptor	fs/fcntl.c
64	getppid	get parent process ID	kernel/sched.c
65	getpgrp	get the process group ID	kernel/sys.c
66	setsid	creates a session and sets the process group ID	kernel/sys.c
67	sigaction	POSIX signal handling functions	arch/i386/kernel/signal.c
68	sgetmask	ANSI C signal handling	kernel/signal.c

69	ssetmask	ANSI C signal handling	kernel/signal.c
70	setreuid	set real and effective user IDs	kernel/sys.c
71	setregid	set real and effective group IDs	kernel/sys.c
72	sigsuspend	install a signal mask and suspend caller until signal	arch/i386/kernel/signal.c
73	sigpending	examine signals that are blocked and pending	kernel/signal.c
74	sethostname	set hostname	kernel/sys.c
75	setrlimit	set maximum system resource con sumption	kernel/sys.c
76	getrlimit	get maximum system resource con sumption	kernel/sys.c
77	getrusage	get maximum system resource con sumption	kernel/sys.c
78	gettimeofday	get the date and time	kernel/time.c
79	settimeofday	set the date and time	kernel/time.c
80	getgroups	get list of supplementary group IDs	kernel/sys.c
81	setgroups	set list of supplementary group IDs	kernel/sys.c
82	old_select	sync. I/O multiplexing	arch/i386/kernel/sys_i386.c
83	symlink	make a symbolic link to a file	fs/namei.c
84	lstat	get file status	fs/stat.c
85	readlink	read the contents of a symbolic link	fs/stat.c
86	uselib	select shared library	fs/exec.c
87	swapon	start swapping to file/device	mm/swapfile.c
88	reboot	reboot or enable/disable Ctrl-Alt-Del	kernel/sys.c
89	old_readdir	read directory entry	fs/readdir.c
90	old_mmap	map pages of memory	arch/i386/kernel/sys_i386.c
91	munmap	unmap pages of memory	mm/mmap.c
92	truncate	set a file to a specified length	fs/open.c
93	ftruncate	set a file to a specified length	fs/open.c
94	fchmod	change access permission mode of file	fs/open.c
95	fchown	change owner and group of a file	fs/open.c
96	getpriority	get program scheduling priority	kernel/sys.c
97	setpriority	set program scheduling priority	kernel/sys.c

98	profil	execution time profile
99	statfs	get file system statistics	fs/open.c
100	fstatfs	get file system statistics	fs/open.c
101	ioperm	set port input/output permissions	arch/i386/kernel/ioport.c
102	socketcall	socket system calls	net/socket.c
103	syslog	read and/or clear kernel message ring buffer	kernel/printk.c
104	setitimer	set value of interval timer	kernel/itimer.c
105	getitimer	get value of interval timer	kernel/itimer.c
106	sys_newstat	get file status	fs/stat.c
107	sys_newlstat	get file status	fs/stat.c
108	sys_newfstat	get file status	fs/stat.c
109	olduname	get name and information about current kernel	arch/i386/kernel/sys_i386.c
110	iopl	change I/O privilege level	arch/i386/kernel/ioport.c
111	vhangup	virtually hangup the current tty	fs/open.c
112	idle	make process 0 idle	arch/i386/kernel/process.c
113	vm86old	enter virtual 8086 mode	arch/i386/kernel/vm86.c
114	wait4	wait for process termination, BSD style	kernel/exit.c
115	swapoff	stop swapping to file/device	mm/swapfile.c
116	sysinfo	returns information on overall system statistics	kernel/info.c
117	ipc	System V IPC system calls	arch/i386/kernel/sys_i386.c
118	fsync	synchronize a file's complete in-core state with that on disk	fs/buffer.c
119	sigreturn	return from signal handler and cleanup stack frame	arch/i386/kernel/signal.c
120	clone	create a child process	arch/i386/kernel/process.c
121	setdomain-name	set domain name	kernel/sys.c
122	uname	get name and information about current kernel	kernel/sys.c
123	modify_ldt	get or set ldt	arch/i386/kernel/ldt.c
124	adjtimex	tune kernel clock	kernel/time.c
125	mprotect	set protection of memory mapping	mm/mprotect.c

126	sigprocmask	POSIX signal handling functions	kernel/signal.c
127	create_module	create a loadable module entry	kernel/module.c
128	init_module	initialize a loadable module entry	kernel/module.c
129	delete_module	delete a loadable module entry	kernel/module.c
130	get_kernel_syms	retrieve exported kernel and module symbols	kernel/module.c
31	quotactl	manipulate disk quotas	fs/dquot.c
132	getpgid	get process group ID	kernel/sys.c
133	fchdir	change working directory	fs/open.c
134	bdflush	start, flush, or tune buffer-dirty-flush daemon	fs/buffer.c
135	sysfs	get file system type information	fs/super.c
136	personality	set the process execution domain	kernel/exec_domain.c
137	afs_syscall	(unimplemented)
138	setfsuid	set user identity used for file system checks	kernel/sys.c
139	setfsgid	set group identity used for file system checks	kernel/sys.c
140	sys_llseek	move extended read/write file pointer	fs/read_write.c
141	getdents	read directory entries	fs/readdir.c
142	select	sync. I/O multiplexing	fs/select.c
143	flock	apply or remove an advisory lock on an open file	fs/locks.c
144	msync	synchronize a file with a memory map	mm/filemap.c
145	readv	read data into multiple buffers	fs/read_write.c
146	writev	write data into multiple buffers	fs/read_write.c
147	sys_getsid	get process group ID of session leader	kernel/sys.c
148	fdatasync	synchronize a file's in-core data with that on disk	fs/buffer.c
149	sysctl	read/write system parameters	kernel/sysctl.c
150	mlock	lock pages in memory	mm/mlock.c
151	munlock	unlock pages in memory	mm/mlock.c

152	mlockall	disable paging for calling process	mm/mlock.c
153	munlockall	reenable paging for calling process	mm/mlock.c
154	sched_set-param	set scheduling parameters	kernel/sched.c
155	sched_get-param	get scheduling parameters	kernel/sched.c
156	sched_set-scheduler	set scheduling algorithm parameters	kernel/sched.c
157	sched_get-scheduler	get scheduling algorithm parameters	kernel/sched.c
158	sched_yield	yield the processor	kernel/sched.c
159	sched_get_p-riority_max	get max static priority range	kernel/sched.c
160	sched_get_p-riority_min	get min static priority range	kernel/sched.c
161	sched_rr_get_inter-val	get the SCHED_RR interval for the named process	kernel/sched.c
162	nanosleep	pause execution for a specified time (nano seconds)	kernel/sched.c
163	mremap	re-map a virtual memory address	mm/mremap.c
164	setresuid	set real, effective and saved user or group ID	kernel/sys.c
165	getresuid	get real, effective and saved user or group ID	kernel/sys.c
166	vm86	enter virtual 8086 mode	arch/i386/kernel/vm86.c
167	query_module	query the kernel for various bits pertain ing to modules	kernel/module.c
168	poll	wait for some event on a file descriptor	fs/select.c
169	nfsservctl	syscall interface to kernel nfs daemon	fs/filesystems.c
170	setresgid	set real, effective and saved user or group ID	kernel/sys.c
171	getresgid	get real, effective and saved user or group ID	kernel/sys.c
172	prctl	operations on a process	kernel/sys.c
173	rt_sigreturn		arch/i386/kernel/signal.c
174	rt_sigaction		kernel/signal.c

175	rt_sigprocmask		kernel/signal.c
176	rt_sigpending		kernel/signal.c
177	rt_sigtimedwait		kernel/signal.c
178	rt_sigqueueinfo		kernel/signal.c
179	rt_sigsuspend		arch/i386/kernel/signal.c
180	pread	read from a file descriptor at a given offset	fs/read_write.c
181	sys_pwrite	write to a file descriptor at a given offset	fs/read_write.c
182	chown	change ownership of a file	fs/open.c
183	getcwd	Get current working directory	fs/dcache.c
184	capget	get process capabilities	kernel/capability.c
185	capset	set process capabilities	kernel/capability.c
186	sigaltstack	set/get signal stack context	arch/i386/kernel/signal.c
187	sendfile	transfer data between file descriptors	mm/filemap.c
188	getpmsg	(unimplemented)
189	putpmsg	(unimplemented)
190	vfork	create a child process and block parent	arch/i386/kernel/process.c