Manual Page Result
0
Command: mprotect | Section: 2 | Source: NetBSD | File: mprotect.2
MPROTECT(2) FreeBSD 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 Placeholder when requesting no access permission.
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.
The PROT_EXEC flag was attempted on pages which belong
to a file system mounted with the NOEXEC flag.
The new protection is less restrictive than the
protection originally set with mmap(2).
PaX mprotect restrictions prohibit the requested
protection.
[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 SunOS 4.0 and subsequently
4.4BSD.
FreeBSD 14.1-RELEASE-p8 September 8, 2019 FreeBSD 14.1-RELEASE-p8