PR_SET_MM_BRK(2const)                                    PR_SET_MM_BRK(2const)

NAME
       PR_SET_MM_BRK - modify kernel memory map descriptor fields

LIBRARY
       Standard C library (libc, -lc)

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

       int prctl(PR_SET_MM, PR_SET_MM_BRK, unsigned long addr, 0L, 0L);

DESCRIPTION
       Set the current brk(2) value.

       The requirements for the address are the same as for the
       PR_SET_MM_START_BRK option.

RETURN VALUE
       On success, 0 is returned.  On error, -1 is returned, and errno is set
       to indicate the error.

ERRORS
       EINVAL addr is greater than TASK_SIZE (the limit on the size of the
              user address space for this architecture).

       EINVAL addr is less than or equal to the end of the data segment or
              specifies a value that would cause the RLIMIT_DATA resource
              limit to be exceeded.

STANDARDS
       Linux.

HISTORY
       Linux 3.3.

SEE ALSO
       prctl(2), PR_SET_MM(2const), PR_SET_MM_START_BRK(2const)

Linux man-pages 6.19              2026-02-08             PR_SET_MM_BRK(2const)