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mprotect(2)
mprotect(2) System Calls mprotect(2)
NAME
mprotect - set protection of memory mapping
SYNOPSIS
#include <sys/mman.h>
int mprotect(void *addr, size_t len, int prot);
DESCRIPTION
The mprotect() function changes the access protections on the mappings
specified by the range [addr, addr + len), rounding len up to the next
multiple of the page size as returned by sysconf(3C), to be that speci‐
fied by prot. The addr argument must be a multiple of the pagesize as
returned by sysconf(3C). Legitimate values for prot are the same as
those permitted for mmap(2) and are defined in <sys/mman.h> as:
PROT_READ /* page can be read */
PROT_WRITE /* page can be written */
PROT_EXEC /* page can be executed */
PROT_NONE /* page can not be accessed */
When mprotect() fails for reasons other than EINVAL, the protections on
some of the pages in the range [addr, addr + len) may have been
changed. If the error occurs on some page at addr2, then the protec‐
tions of all whole pages in the range [addr, addr2] will have been mod‐
ified.
RETURN VALUES
Upon successful completion, mprotect() returns 0. Otherwise, it returns
−1 and sets errno to indicate the error.
ERRORS
The mprotect() function will fail if:
EACCES The prot argument specifies a protection that violates the
access permission the process has to the underlying memory
object.
There are addresses in the range [addr, addr + len) which are
part of a shmget_osm(2) created shared memory segment, and
the prot argument would change the permissions of the seg‐
ment.
EINVAL The len argument has a value equal to 0, or addr is not a
multiple of the page size as returned by sysconf(3C).
ENOMEM Addresses in the range [addr, addr + len) are invalid for the
address space of a process, or specify one or more pages
which are not mapped.
The mprotect() function may fail if:
EAGAIN The address range [addr, addr + len) includes one or more
pages that have been locked in memory and that were mapped
MAP_PRIVATE; prot includes PROT_WRITE; and the system has in‐
sufficient resources to reserve memory for the private pages
that may be created. These private pages may be created by
store operations in the now-writable address range.
ATTRIBUTES
See attributes(7) for descriptions of the following attributes:
tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE TYPEAT‐
TRIBUTE VALUE _ Interface StabilityCommitted _ StandardSee stan‐
dards(7).
SEE ALSO
mmap(2), memcntl(2), mlock(3C), mlockall(3C), plock(3C), sysconf(3C),
attributes(7), standards(7)
HISTORY
The mprotect() function has been included in all Sun and Oracle re‐
leases of Solaris.
Oracle Solaris 11.4 30 Jan 2023 mprotect(2)