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mprotect.2freebsd
Langue: en
Version: 266354 (debian - 07/07/09)
Section: 2 (Appels système)
BSD mandoc
NAME
mprotect - control the protection of pagesLIBRARY
Lb libcSYNOPSIS
In sys/mman.h Ft int Fn mprotect const void *addr size_t len int protDESCRIPTION
The Fn mprotect system call changes the specified pages to have protection Fa prot . Not all implementations will guarantee protection on a page basis; the granularity of protection changes may be as large as an entire region. A region is the virtual address space defined by the start and end addresses of a Vt struct vm_map_entry .Currently these protection bits are known, which can be combined, OR'd together:
- PROT_NONE
- No permissions at all.
- PROT_READ
- The pages can be read.
- PROT_WRITE
- The pages can be written.
- PROT_EXEC
- The pages can be executed.
RETURN VALUES
Rv -std mprotectERRORS
The Fn mprotect system call will fail if:- Bq Er EINVAL
- The virtual address range specified by the Fa addr and Fa len arguments is not valid.
- Bq Er EACCES
- The calling process was not allowed to change the protection to the value specified by the Fa prot argument.
SEE ALSO
madvise(2), mincore(2), msync(2), munmap(2)HISTORY
The Fn mprotect system call first appeared in BSD 4.4Contenus ©2006-2024 Benjamin Poulain
Design ©2006-2024 Maxime Vantorre