MPROTECT(2)               OpenBSD Programmer's Manual              MPROTECT(2)

NAME
     mprotect - control the protection of pages



SYNOPSIS
     #include <sys/types.h>
     #include <sys/mman.h>

     int
     mprotect(void *addr, size_t len, int prot);

DESCRIPTION
     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 re-
     gion.

RETURN VALUES
     Upon successful completion, a value of 0 is returned.  Otherwise, a value
     of -1 is returned and errno is set to indicate the error.

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

HISTORY
     The mprotect() function first appeared in 4.4BSD.

OpenBSD 2.6                      June 9, 1993                                1