#include <sys/mman.h>

     int
     mprotect(caddr_t 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
     region.

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.

BSD                              June 9, 1993                              BSD