PR_SET_MM - modify kernel memory map descriptor fields

NAME LIBRARY SYNOPSIS DESCRIPTION RETURN VALUE ERRORS STANDARDS HISTORY SEE ALSO

NAME

PR_SET_MM − modify kernel memory map descriptor fields

SYNOPSIS

#include <linux/prctl.h> /* Definition of PR_* constants */
#include <sys/prctl.h>

int prctl(PR_SET_MM, long op, ...);

Modify certain kernel memory map descriptor fields of the calling process. Usually these fields are set by the kernel and dynamic loader (see ld.so(8) for more information) and a regular application should not use this feature. However, there are cases, such as self-modifying programs, where a program might find it useful to change its own memory map.

The calling process must have the CAP_SYS_RESOURCE capability. The value in op is one of the options below.
PR_SET_MM_START_CODE
PR_SET_MM_END_CODE
PR_SET_MM_START_DATA
PR_SET_MM_END_DATA
PR_SET_MM_START_STACK
PR_SET_MM_START_BRK
PR_SET_MM_BRK
PR_SET_MM_ARG_START
PR_SET_MM_ARG_END
PR_SET_MM_ENV_START
PR_SET_MM_ENV_END
PR_SET_MM_AUXV
PR_SET_MM_EXE_FILE
PR_SET_MM_MAP
PR_SET_MM_MAP_SIZE

RETURN VALUE

On success, 0 is returned. On error, −1 is returned, and errno is set to indicate the error.

ERRORS

	EINVAL		op is not a valid value.
	EPERM		The caller does not have the CAP_SYS_RESOURCE capability.

STANDARDS

Linux.

HISTORY

Linux 3.3.

Before Linux 3.10, this feature is available only if the kernel is built with the CONFIG_CHECKPOINT_RESTORE option enabled.