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

NAME
     mprotect — control the protection of pages

LIBRARY
     Standard C Library (libc, -lc)

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;
     the granularity of protection changes may be as large as an entire
     region.

     The protections (region accessibility) are specified in the prot argument
     by OR'ing the following values:

	   PROT_EXEC   Pages may be executed.

	   PROT_READ   Pages may be read.

	   PROT_WRITE  Pages may be written.

	   PROT_NONE   No permissions.

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
     [EACCES]		A memory protection violation occurred, or the
			PROT_EXEC flag was attempted on pages which belong to
			a filesystem mounted with the NOEXEC flag.

     [EINVAL]		An invalid memory range, or invalid parameters were
			provided.

     [ENOMEM]		A resource shortage occurred while internally calling
			uvm_map_protect(9).

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

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

BSD				 April 3, 2011				   BSD

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