HP-UX Reference (11i v1 00/12) - 2 System Calls (vol 5)

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STANDARD Printed by: Nora Chuang [nchuang] STANDARD

/build/1111/BRICK/man2/!!!intro.2

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mprotect(2) mprotect(2)

HP-UX EXTENSIONS

SYNOPSIS

int mprotect(

caddr_t addr,

size_t len,

int prot );

DESCRIPTION

If the address range does not correspond to one created by a successful call to mmap(), mprotect()

returns an error. prot determines whether read, write, execute, or some combination of accesses are per-

mitted to the data being mapped.

If the address range being modiﬁed corresponds to a mapped ﬁle that was mapped with MAP_SHARED ,

mprotect() grants write access permission only if the ﬁle descriptor used to map the ﬁle was opened for

writing. If the address range corresponds to a mapped ﬁle that was mapped with the MAP_PRIVATE or

the MAP_ANONYMOUS

ﬂag, mprotect() grants all requested access permissions.

For example, suppose an error occurs on some page at an addr2;

mprotect() may have modiﬁed the

protections of all whole pages in the range [addr,addr2].

ERRORS

[EINVAL] prot is invalid, or addr is not a multiple of the page size as returned by

sysconf(_SC_PAGE_SIZE)

[EFAULT] The range speciﬁed by [addr, addr+len] (from, and including, addr to, but not includ-

ing, addr+len) is invalid for a process’ address space, or the range speciﬁes one or

more unmapped pages.

AUTHOR

mprotect() was developed by HP, AT&T, and OSF.