MPROTECT(2) BSD System Calls Manual MPROTECT(2)
mprotect -- control the protection of pages
mprotect(caddr_t addr, size_t len, int prot);
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
Upon successful completion, a value of 0 is returned. Otherwise, a value
of -1 is returned and errno is set to indicate the error.
madvise(2), mincore(2), msync(2), munmap(2)
The mprotect() function first appeared in 4.4BSD.
BSD June 9, 1993 BSD