mprotect — control the protection of pages

The mprotect() system call changes the specified pages to have protection prot. Not all implementations will guarantee protection on a page basis; the granularity of protection changes may be as large as an entire region. A region is the virtual address space defined by the start and end addresses of a structvm_map_entry. Currently these protection bits are known, which can be combined, OR'd together: PROT_NONE No permissions at all. PROT_READ The pages can be read. PROT_WRITE The pages can be written. PROT_EXEC The pages can be executed.

The mprotect() system call will fail if: [EACCES] The calling process was not allowed to change the protection to the value specified by the prot argument. [EINVAL] The virtual address range specified by the addr and len arguments is not valid.

The mprotect() system call first appeared in 4.4BSD. Debian August 3, 2016 MPROTECT(2)

Standard C Library (libc, -lc)

mprotect — control the protection of pages

The mprotect() function returns the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to indicate the error.

madvise(2), mincore(2), msync(2), munmap(2)

#include<sys/mman.h>intmprotect(void*addr, size_tlen, intprot);