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NetBSD 6.1.5 - man page for mprotect (netbsd section 2)

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 fol-
     lowing 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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