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System Calls
Time Functionalities
| Function | Description |
| gettimeofday | Gets time |
Timer Functionalities
| Function | Description |
| clock | Determines processor time |
| nanosleep | Pauses execution for a specified time |
| sleep | Delays for a specified amount of time |
Directory Handling
|
Function |
Description |
| seekdir | Sets the position of the next readdir call in the directory stream. |
| rewinddir | Resets directory stream |
| telldir | Returns the current location in the directory stream |
| closedir | Closes a directory |
| opendir | Opens a directory |
| readdir | Reads directory entry |
| mkdir | Makes directories |
| unlink | Calls the unlink function to remove the specified file |
| rmdir | Remove empty directories |
| fchdir | Changes working directory |
| chdir | Changes working directory |
File Attributes
| Functions | Description |
| chmod | Changes file access permissions |
| fchmod | Changes permissions of a file |
| ftruncate | Truncates a file to a specified length |
| utimes | Changes access and/or modification times of an inode |
| fstat | Gets file status |
| lstat | Gets file status |
| utime | Changes access and/or modification times of an inode |
| rename | Rename files |
| link | Calls the link function to create a link to a file |
| readlink | Displays value of a symbolic link |
| symlink | Makes a new name for a file |
| sysconf | Gets configuration information at runtime |
Operations on File Descriptors
| Functions | Description |
| fcntl | Manipulates file descriptor |
| dup | Duplicates a file descriptor |
| dup2 | Duplicates a file descriptor |
| readv | Reads or writes data into multiple buffers |
| writev | Reads or writes data into multiple buffers |
| ioctl | Controls device |
| creat | Opens and possibly creates a file or device |
| lseek | Repositions a read/write file offset |
| sync | Flushes filesystem buffers |
| fsync | Synchronizes a fileâs complete in-core state with that on disk |
Memory-mapped I/O
| Functions | Description |
| mmap | Map or unmap files or devices into memory |
| mprotect | Controls allowable accesses to a region of memory |
| msync | Synchronizes a file with a memory map |
| munmap | Map or unmap files or devices into memory |
FIFOs
| Functions | Description |
| mkfifo | Make FIFOs (named pipes) |
Pipes
POSIX spawn
| Functions | Description |
| glob | Generates pathnames matching a pattern. |
| globfree | Generates pathnames matching a pattern. |
| posix_spawn | Spawns a process. |
| posix_spawn_file_actions_addclose | Adds a close action to the file actions object. |
| posix_spawn_file_actions_addopen | Adds a open action to the file action object. |
| posix_spawn_file_actions_adddup2 | Add a dup2 action to the spawn file actions object. |
| posix_spawn_file_actions_destroy | Destroys the spawn file actions object. |
| posix_spawn_file_actions_init | Initialize the spawn file actions object. |
| posix_spawnattr_destroy | Destroys the spawn attribute object. |
| posix_spawnattr_init | Initialize the spawn attribute object. |
| posix_spawnattr_getflags | Get the value of the spawn-flags attribute. |
| posix_spawnattr_setflags | Set the value of the spawn-flags attribute. |
| posix_spawnattr_getpgroup | Get the value of the spawn-pgroup attribute from the attributes object. |
| posix_spawnattr_setpgroup | Set the spawn-pgroup attribute in an initialized attributes object |
| posix_spawnattr_getschedparam | Get the value of the spawn-schedparam attribute from the attributes object. |
| posix_spawnattr_setschedparam | Set the spawn-schedparam attribute in an initialized attributes object. |
| posix_spawnattr_getschedpolicy | Get the value of the spawn-schedpolicy attribute from the attributes object. |
| posix_spawnattr_setschedpolicy | Set the spawn-schedpolicy attribute in an initialized attributes object. |
| posix_spawnattr_getsigdefault | Get the value of the spawn-sigdefault attribute from the attributes object. |
| posix_spawnattr_setsigdefault | Set the spawn-sigdefault attribute in an initialized attributes object. |
| posix_spawnattr_getsigmask | Get the value of the spawn-sigmask attribute from the attributes object. |
| posix_spawnattr_setsigmask | Set the spawn-sigmask attribute in an initialized attributes object. |
Process Completion
| Functions | Description |
| wait | Wait for process termination |
| waitpid | Wait for process termination |
| wait4 | Wait for process termination, BSD style |
Process Identification
| Functions | Description |
| getpid | Get process identification |
Program Scheduling Priority
| Functions | Description |
| nice | Run a program with modified scheduling priority |
| getpriority | Gets program scheduling priority |
| setpriority | Sets program scheduling priority |
Path Handling
| Functions | Description |
| pathconf | Gets configuration values for files |
System Names Handling
| Functions | Description |
| uname | Prints system information |
Querying Memory Resources
| Functions | Description |
| getpagesize | Gets memory page size |