NAME¶

PR_SET_MM_START_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_START_BRK, unsigned long addr, 0L, 0L);

DESCRIPTION¶

Set the address above which the program heap can be expanded with brk(2) call.

The address must be greater than the ending address of the current program data segment. In addition, the combined size of the resulting heap and the data segment can't exceed the RLIMIT_DATA resource limit (see setrlimit(2)).

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)