NAME
PR_SET_MM - modify kernel memory map descriptor fields
LIBRARY
Standard C library (libc, -lc)
SYNOPSIS
#include <linux/prctl.h>\n /* Definition of \nPR_*\n constants */
\n#include <sys/prctl.h>int prctl(PR_SET_MM, long \nop\n, ...);DESCRIPTION
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.
SEE ALSO
prctl(2), PR_SET_MM_START_CODE(2const), PR_SET_MM_END_CODE(2const), PR_SET_MM_START_DATA(2const), PR_SET_MM_END_DATA(2const), PR_SET_MM_START_STACK(2const), PR_SET_MM_START_BRK(2const), PR_SET_MM_BRK(2const), PR_SET_MM_ARG_START(2const), PR_SET_MM_ARG_END(2const), PR_SET_MM_ENV_START(2const), PR_SET_MM_ENV_END(2const), PR_SET_MM_EXE_FILE(2const), PR_SET_MM_MAP(2const), PR_SET_MM_MAP_SIZE(2const)