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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/types.h>
     #include <sys/mman.h>

     int
     mprotect(const 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	re-
     gion.

RETURN VALUES
     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
     error.

ERRORS
     The mprotect() function 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.

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

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

BSD				 June 9, 1993				   BSD
NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUES | ERRORS | SEE ALSO | HISTORY

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