- Pre-req : Linux Syscall
- For syscall tracing - strace.
$ strace ./a.out- This sheet doesn't contain all but some common syscalls.
- Location of syscalls in Linux :
/usr/include/asm/unistd_32.h
| syscall No. | Func Name | Description | |:----------- |:-------------------------|: ---------------------------------------------------------------------------:| |1. | exit | terminate the current process | |2. | fork | create a child process | |3. | read | read from a file descriptor | |4. | write | write to a file descriptor | |5. | open | open a file or device | |6. | close | close a file descriptor | |11. | execve | execute program | |14. | mknod | create a special or ordinary file | |18. | stat | get file status | |26. | ptrace | allows a parent process to control the execution of a child process | |27. | alarm | set an alarm clock for delivery of a signal | |28. | fstat | get file status | |30. | utime | set file access and modification times | |37. | kill | send signal to a process | |41. | dup | duplicate an open file descriptor | |42. | pipe | create an interprocess channel | |43. | times | get process times | |45. | brk | change the amount of space allocated for the calling process's data segment | |48. | sys_signal | ANSI C signal handling | |54. | ioctl | control device | |62. | ustat | get file system statistics | |63. | dup2 | duplicate a file descriptor | |64. | getppid | get parent process ID | |65. | getpgrp | get the process group ID | |66. | setsid | creates a session and sets the process group ID | |67. | sigaction | POSIX signal handling functions | |68. | sgetmask | ANSI C signal handling | |69. | ssetmask | ANSI C signal handling | |75. | setrlimit | set maximum system resource con sumption | |76. | getrlimit | get maximum system resource con sumption | |77. | getrusage | get maximum system resource con sumption | |82. | old_select | sync. I/O multiplexing | |83. | symlink | make a symbolic link to a file | |84. | lstat | get file status | |85. | readlink | read the contents of a symbolic link | |90. | old_mmap | map pages of memory | |91. | munmap | unmap pages of memory | |96. | getpriority | get program scheduling priority | |97. | setpriority | set program scheduling priority | |99. | statfs | get file system statistics | |100. | fstatfs | get file system statistics | |101. | ioperm | set port input/output permissions | |102. | socketcall | socket system calls | |103. | syslog | read and/or clear kernel message ring buffer | |104. | setitimer | set value of interval timer | |105. | getitimer | get value of interval timer | |106. | sys_newstat | get file status | |110. | iopl change | I/O privilege level | |111. | vhangup | virtually hangup the current tty | |112. | idle | make process 0 idle | |113. | vm86old | enter virtual 8086 mode | |114. | wait4 | wait for process termination, BSD style | |115. | swapoff | stop swapping to file/device | |116. | sysinfo | returns information on overall system statistics | |117. | ipc | System V IPC system calls | |119. | sigreturn | return from signal handler and cleanup stack frame | |120. | clone | create a child process | |122. | uname | get name and information about current kernel | |125. | mprotect | set protection of memory mapping | |126. | sigprocmask | POSIX signal handling functions | |130. | get_kernel_syms | retrieve exported kernel and module symbols | |131. | quotactl | manipulate disk quotas | |132. | getpgid | get process group ID | |133. | fchdir | change working directory | |134. | bdflush | start, flush, or tune buffer-dirty-flush daemon | |135. | sysfs | get file system type information | |136. | personality | set the process execution domain | |138. | setfsuid | set user identity used for file system checks | |139. | setfsgid | set group identity used for file system checks | |140. | sys_llseek | move extended read/write file pointer | |141. | getdents | read directory entries | |142. | select | sync. I/O multiplexing | |143. | flock | apply or remove an advisory lock on an open file | |144. | msync | synchronize a file with a memory map | |145. | readv | read data into multiple buffers | |146. | writev | write data into multiple buffers | |147. | sys_getsid | get process group ID of session leader | |148. | fdatasync | synchronize a file's in-core data with that on disk | |149. | sysctl | read/write system parameters | |150. | mlock | lock pages in memory | |151. | munlock | unlock pages in memory | |152. | mlockall | disable paging for calling process | |153. | munlockall | reenable paging for calling process | |154. | sched_setparam | set scheduling parameters | |155. | sched_getparam | get scheduling parameters | |156. | sched_setscheduler | set scheduling algorithm parameters | |157. | sched_getscheduler | get scheduling algorithm parameters | |158. | sched_yield | yield the processor | |159. | sched_get_priority_max| get max static priority range | |160. | sched_get_priority_min| get min static priority range | |161. | sched_rr_get_interval | get the SCHED_RR interval for the named process | |162. | nanosleep | pause execution for a specified time (nano seconds) | |163. | mremap | re-map a virtual memory address | |164. | setresuid | set real, effective and saved user or group ID | |165. | getresuid | get real, effective and saved user or group ID | |166. | vm86 | enter virtual 8086 mode | |167. | query_module | query the kernel for various bits pertaining to modules | |168. | poll | wait for some event on a file descriptor | |169. | nfsservctl | syscall interface to kernel nfs daemon | |170. | setresgid | set real, effective and saved user or group ID | |171. | getresgid | get real, effective and saved user or group ID | |172. | prctl | operations on a process | |180. | pread | read from a file descriptor at a given offset | |181. | sys_pwrite | write to a file descriptor at a given offset | |182. | chown | change ownership of a file | |183. | getcwd | Get current working directory | |184. | capget | get process capabilities | |185. | capset | set process capabilities | |186. | sigaltstack | set/get signal stack context | |187. | sendfile | transfer data between file descriptors | |190. | vfork | create a child process and block parent |