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OSX 10.14 Mojave - man page for mprotect (mojave section 2)

MPROTECT(2)						      BSD System Calls Manual						       MPROTECT(2)

NAME
mprotect -- control the protection of pages
SYNOPSIS
#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 but Mac OS X's current implementation does. When a program violates the protections of a page, it gets a SIGBUS or SIGSEGV signal. Currently prot can be one or more of the following: 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.
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.
ERRORS
mprotect() will fail if: [EACCES] The requested protection conflicts with the access permissions of the process on the specified address range. [EINVAL] addr is not a multiple of the page size (i.e. addr is not page-aligned). [ENOTSUP] The combination of accesses requested in prot is not supported.
LEGACY SYNOPSIS
#include <sys/types.h> #include <sys/mman.h> The include file <sys/types.h> is necessary. int mprotect(caddr_t addr, size_t len, int prot); The type of addr has changed.
SEE ALSO
madvise(2), mincore(2), msync(2), munmap(2), compat(5)
HISTORY
The mprotect() function first appeared in 4.4BSD.
BSD
October 16, 2008 BSD

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