rtas(2) [centos man page]

RTAS(2) 							System Calls Manual							   RTAS(2)

NAME

       rtas - Allows userspace to call RTAS (Run Time Abstraction Services)

SYNOPSIS

       int ppc_rtas (struct rtas_args *uargs);

DESCRIPTION

       ppc_rtas  enables userspace manipulation of the RunTime Abstraction Services (RTAS). RTAS provides for a portable method of access and set-
       ting system information. For example, you could gather information on various system sensors and set poweron values. RTAS is  accessed  via
       the  /proc  entry called "rtas". Manipulations on RTAS are implemented via command line arguments on /proc/rtas.  The values for uargs vary
       greatly.  For more information, see the view/arch/ppcKconfig file.

RETURN VALUE

       rtas returns 0 on success; otherwise it returns one of the errors listed in the "Errors" section.

ERRORS

       -EPERM User does not have CAP_SYS_ADMIN capabilities.

       -EFAULT
	      Problem copying uargs values to/from user space.

       -EINVAL
	      Either number of uargs passed in too large or size of uargs array too large.

AUTHOR

       Niki Rahimi.

																	   RTAS(2)

MMAP2(2)						     Linux Programmer's Manual							  MMAP2(2)

NAME

       mmap2 - map files or devices into memory

SYNOPSIS

       #include <sys/mman.h>

       void *mmap2(void *addr, size_t length, int prot,
		    int flags, int fd, off_t pgoffset);

DESCRIPTION

       The  mmap2()  system call operates in exactly the same way as mmap(2), except that the final argument specifies the offset into the file in
       4096-byte units (instead of bytes, as is done by mmap(2)).  This enables applications that use a 32-bit off_t to map  large  files  (up	to
       2^44 bytes).

RETURN VALUE

       On success, mmap2() returns a pointer to the mapped area.  On error -1 is returned and errno is set appropriately.

ERRORS

       EFAULT Problem with getting the data from userspace.

       EINVAL (Various platforms where the page size is not 4096 bytes.)  offset * 4096 is not a multiple of the system page size.

       mmap2() can return any of the same errors as mmap(2).

VERSIONS

       mmap2() is available since Linux 2.3.31.

CONFORMING TO

       This system call is Linux-specific.

NOTES

       Nowadays, the glibc mmap() wrapper function invokes this system call rather than the mmap(2) system call.

       On ia64, the unit for offset is actually the system page size, rather than 4096 bytes.

SEE ALSO

       getpagesize(2), mmap(2), mremap(2), msync(2), shm_open(3)

COLOPHON

       This  page is part of release 3.25 of the Linux man-pages project.  A description of the project, and information about reporting bugs, can
       be found at http://www.kernel.org/doc/man-pages/.

Linux								    2008-04-22								  MMAP2(2)