mprotect man page on FreeBSD

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

     mprotect — control the protection of pages

     Standard C Library (libc, -lc)

     #include <sys/mman.h>

     mprotect(const void *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
     region.  A region is the virtual address space defined by the start and
     end addresses of a struct vm_map_entry.

     Currently these protection bits are known, which can be combined, OR'd

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

     The mprotect() system call will fail if:

     [EINVAL]		The virtual address range specified by the addr and
			len arguments is not valid.

     [EACCES]		The calling process was not allowed to change the pro‐
			tection to the value specified by the prot argument.

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

     The mprotect() system call first appeared in 4.4BSD.

BSD				 June 9, 1993				   BSD

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