Manual browser: mprotect(2)
|MPROTECT(2)||System Calls Manual||MPROTECT(2)|
NAMEmprotect — control the protection of pages
LIBRARYStandard C Library (libc, -lc)
mprotect(void *addr, size_t len, int prot);
DESCRIPTIONThe 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:
- Pages may be executed.
- Pages may be read.
- Pages may be written.
- No permissions.
RETURN VALUESUpon successful completion, a value of 0 is returned. Otherwise, a value of -1 is returned and errno is set to indicate the error.
- A memory protection violation occurred, or the PROT_EXEC flag was attempted on pages which belong to a filesystem mounted with the NOEXEC flag.
- An invalid memory range, or invalid parameters were provided.
- A resource shortage occurred while internally calling uvm_map_protect(9).
SEE ALSOmadvise(2), mincore(2), msync(2), munmap(2)
HISTORYThe mprotect() function first appeared in 4.4BSD.
|April 3, 2011||NetBSD 7.0|