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Rudiments
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#include <sys.h>
The sys class provides methods for controlling the state of and accessing information about the operating system.
Advises the kernel that you are going to access the region of memory begining at byte "ptr", for "size" bytes, normally so the kernel can undo any previously applied optimizations.
Returns true on success and false on failure.
On operating systems don't support this method, it returns true but don't actually do anything.
Advises the kernel that you are going to access the region of memory begining at byte "ptr", for "size" bytes, randomly so the kernel can perform some optimizations.
Returns true on success and false on failure.
On operating systems don't support this method, it returns true but don't actually do anything.
Advises the kernel that you are going to access the region of memory begining at byte "ptr", for "size" bytes, sequentially so the kernel can perform some optimizations.
Returns true on success and false on failure.
On operating systems don't support this method, it returns true but don't actually do anything.
Advises the kernel that you are going to access the region of memory begining at byte "ptr", for "size" bytes, in the near future so the kernel can perform some optimizations.
Returns true on success and false on failure.
On operating systems don't support this method, it returns true but don't actually do anything.
Advises the kernel that you are not going to access the region of memory begining at byte "ptr", for "size" bytes, in the near future so the kernel can perform some optimizations.
Returns true on success and false on failure.
On operating systems don't support this method, it returns true but don't actually do anything.
Disables paging of the entire address space of the process, including any newly allocated pages.
Returns true on success and false on failure.
On systems that don't support locking, this method returns false;
Disables paging of memory, starting at "ptr", for "size" bytes.
Returns true on success and false on failure.
On systems that don't support disabling paging, this method returns false.
Disables paging of the entire address space of the process. Newly allocated pages may still be paged out.
Returns true on success and false on failure.
On systems that don't support locking, this method returns false;
Disables paging of any newly allocated pages in the address space of the process. Currently allocated pages may still be paged out.
Returns true on success and false on failure.
On systems that don't support locking, this method returns false;
Enables paging of all pages of the address space of the process.
Returns true on success and false on failure.
On systems that don't support locking, this method returns false;
Enables paging of memory, starting at "ptr", for "size" bytes.
Returns true on success and false on failure.
On systems that don't support disabling paging, this method returns false.
Returns the allocation granularity, in bytes. Allocation granularity is the minimum number of bytes that a program's address space can be extended by. It's usually the same as the page size, but not on Windows, for example. Returns -1 if not supported by the system.
Returns the number of bytes of physical memory that are available. Returns -1 if not supported by the system.
Returns the number of pages of physical memory that are available. Returns -1 if not supported by the system.
Returns the number of clock ticks per second - in particular, the number of times per second that the kernel interrupts the CPU(s) to perform process accounting and other tasks. Some kernels are "tickless" though, and the kernel is only interrupted on-demand. This method returns whatever the kernel reports, though some kernels report a value, whether it is valid or not. Returns -1 if not supported by the system.
Returns the number of CPU's that can be bound together in a single CPU Set. Returns -1 if not supported by the system.
Returns the character used to separate directories in a path.
Returns the host name of the machine that the program is running on, as understood by the kernel. This may or may not necessarily be the name the machine is known by on the network.
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Sets the parameters to the load averages from the past one, five and fifteen minutes. Returns true on success and false on failure.
Returns the maximum number of functions that can be registered to run when the process exits. Returns -1 if not supported by the system.
Returns the maximum character length of each command line argument. Returns -1 if not supported by the system.
Returns the maximum number of delay timer expiration overruns. Returns -1 if not supported by the system.
Returns the maximum character length allowed for the host name, not including the null terminator. Returns -1 if not supported by the system.
Returns the maximum character length of a utility's input line length, either from standard input or from a file, including the trailing newline. Returns -1 if not supported by the system.
Returns the maximum character length allowed for a login name, not including the null terminator. Returns -1 if not supported by the system.
Returns the maximum character length that a password can be. Returns -1 if not supported by the system.
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Returns the maximum value that an off64_t can store on this platform.
Returns the maximum number of files that a single process can have open simultaneously. Returns -1 if not supported by the system.
Returns the maximum number of streams that a single process can have open simultaneously. Returns -1 if not supported by the system.
Returns the maximum character length that a password can be. Returns -1 if not supported by the system.
Returns the maximum number of processes that may run concurrently by each user. Returns -1 if not supported by the system.
Returns the maximum character length that a login name can be. Returns -1 if not supported by the system.
Returns the maximum number of processors the system can possibly be configured to support. Returns -1 if not supported by the system.
Returns the maximum number of realtime signals that are reserved for application use. Returns -1 if not supported by the system.
Returns the maximum number of semaphores that a single process can have open simultaneously. Returns -1 if not supported by the system.
Returns the maximum value that a semaphore can have. Returns -1 if not supported by the system.
Returns the maximum number of signals that a single process can have pending at once. Returns -1 if not supported by the system.
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Returns the maximum value that a size_t can store on this platform.
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Returns the maximum value that a ssize_t can store on this platform.
Returns the maximum number of groups that a user can be a member of, aside from its primary group. Returns -1 if not supported by the system.
Returns the maximum number of symlinks that a pathname can resolve to before resolution returns ELOOP. This is useful for detecting symlink loops.
For instance, this value is used by cat in the following example:
$ ln -s file otherfile $ ln -s otherfile file $ cat file cat: file: Too many levels of symbolic links
Returns -1 if not supported by the system.
Returns the maximum character length of a terminal device name, including the null terminator. Returns -1 if not supported by the system.
Returns the maximum number of keys per process. Returns -1 if not supported by the system.
Returns the maximum number of threads that a single process can have open simultaneously. Returns -1 if not supported by the system.
Returns the maximum number of timers that a single process can have running at once. Returns -1 if not supported by the system.
Returns the maximum character length of a timezone name. Returns -1 if not supported by the system.
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Returns the minimum value that an off64_t can store on this platform.
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Returns the minimum value that a size_t can store on this platform.
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Returns the minimum value that a ssize_t can store on this platform.
Returns the minimum size, in bytes, of the stack for each thread. Returns -1 if not supported by the system.
Returns true if all pages of memory starting at "ptr", for "size" bytes are not paged out.
Returns true on success and false on failure.
On systems that don't support checking whether pages of the memory map are currently cached in system ram, this method returns false.
Returns the hardware architecture of the environment that the program is running in. i386, x86_64, ppc, etc.
Returns the name of the operating system. Linux, FreeBSD, Windows, Cygwin, etc.
Returns a string representing the operating system release. Exactly what is returned varies significantly between operating systems.
Returns a string representing the operating system version. Exactly what is returned varies significantly between operating systems.
Returns the page size, in bytes. NOTE: If you're looking for the minimum number of bytes that a programs address space can be extended by, see getAllocationGranularity() instead. On most platforms it's the same as the page size, but it's different on Windows, for example, Returns -1 if not supported by the system.
Returns the number of bytes of physical memory, not including swap. Returns -1 if not supported by the system.
Returns the number of pages of physical memory, not including swap. Returns -1 if not supported by the system.
Returns the number of processors the system is configured to support. Returns -1 if not supported by the system.
Returns the number of processors that are currently online. Returns -1 if not supported by the system.
Returns the version of the rudiments library.
Returns true if signals interrupt system calls on this platform and false if signals do not interrupt system calls.
Returns a recommended buffer size, in bytes, for use by the getgrnam_r and getgrgid_r functions. This is used internally in the groupentry class if the system supports those functions. Returns -1 if not supported by the system.
Returns a recommended buffer size, in bytes, for use by the getpwnam_r and getpwgid_r functions. This is used internally in the userentry class if the system supports those functions. Returns -1 if not supported by the system.
Returns the number of tries that will be made to destroy thraed-specific data on thread exit. Returns -1 if not supported by the system.
Returns the number of bytes of physical memory that are in use. Returns -1 if not supported by the system.
Returns the number of pages of physical memory that are in use. Returns -1 if not supported by the system.
Halts the operating system. The behavior of this command may vary between operating systems but it generally just halts the kernel without attempting to shut processes down gracefully or commit pending writes to storage.
Returns true if the byte order of the system is big endian and false if the byte order of the system is little endian.
Shuts down and restarts the machine. The behavior of this command may vary between operating systems. Particularly, many operating sytems execute a graceful shutdown before the restart, while others do not.
Sets the host name of the machine, as understood by the kernel.
Sets the host name of the machine, as understood by the kernel.
Sets the protection of the memory map to "protection" for "size" bytes, starting at "ptr".
"protection" may be: PROT_NONE - pages may not be accessed or an or'ed combination of the following: PROT_EXEC - pages may be excuted PROT_READ - pages may be read PROT_WRITE - pages may be written "protection" may not conflict with the open mode of the file. (eg. if the file was opened readonly then PROT_WRITE may not be used).
Note that not all filesystems support all of those options.
Returns true on success and false on failure.
Shuts down the the machine. The behavior of this command may vary between operating systems but it generally attempts to shut processes down gracefully, commits pending writes to storage, halts the kernel and powers down the physical hardware.
1.10.0