debian man page for vrb_new_opt

Query: vrb_new_opt

OS: debian

Section: 3

Format: Original Unix Latex Style Formatted with HTML and a Horizontal Scroll Bar

vrb_new_opt(3)						      VRB Programmer's Manual						    vrb_new_opt(3)

NAME
vrb_new_opt - create a new virtual ring buffer
LIBRARY
-lvrb
SYNOPSIS
#include <vrb.h> vrb_p vrb_new_opt(size_t size, const char *name, int options);
DESCRIPTION
vrb_new_opt creates a new instance of a virtual ring buffer. A virtual ring buffer is a character FIFO queue with the special property that any sequence of characters in the buffer may be accessed as a single contiguous block of memory, eliminating the need to split any sequence to handle a buffer wraparound.
ARGUMENTS
size_t size specifies the requested minimum buffer size to be allocated. The given value will be rounded up to the nearest or equal whole multiple of the system page size. The virtual ring buffer is implemented by mapping two adjacent blocks of memory to the same memory object. Thus, twice as much virtual address space will be used and the specified size must be less than half of the available virtual address space for this process. const char *name specifies an optional temporary name pattern or an actual name of a file to be used as backing store via mmap(2) in a mounted filesystem in which the process has write permission. If the name string ends in "XXXXXX" then mkstemp(3) will be used to make the file unique. Other- wise it will be used as is. If the named file already exists or otherwise cannot be opened for write, an error will occur. If NULL is given, swap space will be used as backing store via shmat(2). int options specifies option flags that may be given to alter the behaviour of the virtual ring buffer. The implemented options are: VRB_NOGUARD Do not include guard pages that would protect against buffer overflow errors. VRB_ENVGUARD Override VRB_NOGUARD if the environment variable VRBGUARD is defined with a value other than the string "0".
RETURN VALUE
vrb_p On success, a handle (pointer) to the newly created virtual ring buffer is returned. On error, NULL is returned.
ERRORS
If an error is returned, then errno will have one of the following values: EINVAL A buffer size was requested which is too large for address space allocation arithmetic. ENOMEM Out of memory allocating the virtual ring buffer structure. - An errno value set by a failing system call.
SEE ALSO
vrb(3), vrb_capacity(3), vrb_data_len(3), vrb_data_ptr(3), vrb_destroy(3), vrb_get(3), vrb_get_min(3), vrb_give(3), vrb_init(3), vrb_init_opt(3), vrb_is_empty(3), vrb_is_full(3), vrb_is_not_empty(3), vrb_is_not_full(3), vrb_move(3), vrb_new(3), vrb_put(3), vrb_put_all(3), vrb_read(3), vrb_read_min(3), vrb_resize(3), vrb_space_len(3), vrb_space_ptr(3), vrb_take(3), vrb_uninit(3), vrb_write(3), vrb_write_min(3) vrb 2002-09-30 vrb_new_opt(3)
Related Man Pages
vmf(3) - bsd
vrb_init(3) - debian
vrb_init_opt(3) - debian
vrb_new(3) - debian
vrb_write_min(3) - debian
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