鍍金池/ 教程/ Linux/ mprotect()函數(shù) Unix/Linux
outb()函數(shù) Unix/Linux
getpeername()函數(shù) Unix/Linux
io_setup()函數(shù) Unix/Linux
mknod()函數(shù) Unix/Linux
arch_prctl()函數(shù) Unix/Linux
inotify_add_watch()函數(shù) Unix/Linux
chmod()函數(shù) Unix/Linux
_exit()函數(shù) Unix/Linux
epoll_ctl()函數(shù) Unix/Linux
Unix/Linux系統(tǒng)調(diào)用
futimesat()函數(shù) Unix/Linux
oldolduname()函數(shù) Unix/Linux
sched_rr_get_interval()函數(shù) Unix/Linux
oldstat()函數(shù) Unix/Linux
pselect()函數(shù) Unix/Linux
close()函數(shù) Unix/Linux
add_key()函數(shù) Unix/Linux
clone()函數(shù) Unix/Linux
rename()函數(shù) Unix/Linux
msgop()函數(shù) Unix/Linux
getrlimit()函數(shù) Unix/Linux
linkat()函數(shù) Unix/Linux
ioprio_set()函數(shù) Unix/Linux
insw()函數(shù) Unix/Linux
munlock()函數(shù) Unix/Linux
getgid()函數(shù) Unix/Linux
chdir()函數(shù) Unix/Linux
rmdir()函數(shù) Unix/Linux
ioctl()函數(shù) Unix/Linux
lchown()函數(shù) Unix/Linux
execve()函數(shù) Unix/Linux
epoll_wait()函數(shù) Unix/Linux
fstatat()函數(shù) Unix/Linux
truncate()函數(shù) Unix/Linux
lock()函數(shù) Unix/Linux
outsb()函數(shù) Unix/Linux
chroot()函數(shù) Unix/Linux
kexec_load()函數(shù) Unix/Linux
afs_syscall()函數(shù) Unix/Linux
dup2()函數(shù) Unix/Linux
_newselect()函數(shù) Unix/Linux
inotify_rm_watch()函數(shù) Unix/Linux
recv()函數(shù) Unix/Linux
msgsnd()函數(shù) Unix/Linux
getdtablesize()函數(shù) Unix/Linux
ioperm()函數(shù) Unix/Linux
munmap()函數(shù) Unix/Linux
getpriority()函數(shù) Unix/Linux
sched_get_priority_min()函數(shù) Unix/Linux
outw_p()函數(shù) Unix/Linux
kill()函數(shù) Unix/Linux
lookup_dcookie()函數(shù) Unix/Linux
accept()函數(shù) Unix/Linux
obsolete()函數(shù) Unix/Linux
pread()函數(shù) Unix/Linux
getgroups()函數(shù) Unix/Linux
personality()函數(shù) Unix/Linux
recvfrom()函數(shù) Unix/Linux
putpmsg()函數(shù) Unix/Linux
getgroups()函數(shù) Unix/Linux
remap_file_pages()函數(shù) Unix/Linux
request_key()函數(shù) Unix/Linux
mount()函數(shù) Unix/Linux
sched_setscheduler()函數(shù) Unix/Linux
mkdirat()函數(shù) Unix/Linux
nfsservctl()函數(shù) Unix/Linux
getuid()函數(shù) Unix/Linux
prof()函數(shù) Unix/Linux
exit_group函數(shù) Unix/Linux
io_cancel()函數(shù) Unix/Linux
mmap()函數(shù) Unix/Linux
mremap()函數(shù) Unix/Linux
getitimer()函數(shù) Unix/Linux
unimplemented()函數(shù) Unix/Linux
read()函數(shù) Unix/Linux
inl()函數(shù) Unix/Linux
posix_fadvise()函數(shù) Unix/Linux
open()函數(shù) Unix/Linux
listen()函數(shù) Unix/Linux
io_destroy()函數(shù) Unix/Linux
acct()函數(shù) Unix/Linux
fcntl()函數(shù) Unix/Linux
recvmsg()函數(shù) Unix/Linux
statfs()函數(shù) Unix/Linux
oldlstat()函數(shù) Unix/Linux
outb()函數(shù) Unix/Linux
getpagesize()函數(shù) Unix/Linux
sched_yield()函數(shù) Unix/Linux
outw()函數(shù) Unix/Linux
inw_p()函數(shù) Unix/Linux
setpgid()函數(shù) Unix/Linux
quotactl()函數(shù) Unix/Linux
prctl()函數(shù) Unix/Linux
fattach()函數(shù) Unix/Linux
readahead()函數(shù) Unix/Linux
msgget()函數(shù) Unix/Linux
gethostname()函數(shù) Unix/Linux
semctl()函數(shù) Unix/Linux
munlockall()函數(shù) Unix/Linux
iopl()函數(shù) Unix/Linux
fdetach()函數(shù) Unix/Linux
getuid()函數(shù) Unix/Linux
gettid()函數(shù) Unix/Linux
pwrite()函數(shù) Unix/Linux
isastream()函數(shù) Unix/Linux
get_thread_area()函數(shù) Unix/Linux
mpx()函數(shù) Unix/Linux
io_getevents()函數(shù) Unix/Linux
lstat()函數(shù) Unix/Linux
readv()函數(shù) Unix/Linux
exit()函數(shù) Unix/Linux
inw()函數(shù) Unix/Linux
fchmod()函數(shù) Unix/Linux
mq_getsetattr()函數(shù) Unix/Linux
get_robust_list()函數(shù) Unix/Linux
_llseek()函數(shù) Unix/Linux
gettimeofday()函數(shù) Unix/Linux
nice()函數(shù) Unix/Linux
security()函數(shù) Unix/Linux
sched_get_priority_max()函數(shù) Unix/Linux
outb_p()函數(shù) Unix/Linux
intro()函數(shù) Unix/Linux
alarm()函數(shù) Unix/Linux
putmsg()函數(shù) Unix/Linux
fork()函數(shù) Unix/Linux
getpgrp()函數(shù) Unix/Linux
link()函數(shù) Unix/Linux
getcwd()函數(shù) Unix/Linux
insl()函數(shù) Unix/Linux
getsockname()函數(shù) Unix/Linux
dup()函數(shù) Unix/Linux
connect()函數(shù) Unix/Linux
select()函數(shù) Unix/Linux
futex()函數(shù) Unix/Linux
outsw()函數(shù) Unix/Linux
query_module()函數(shù) Unix/Linux
reboot()函數(shù) Unix/Linux
create_module()函數(shù) Unix/Linux
adjtimex()函數(shù) Unix/Linux
mlock()函數(shù) Unix/Linux
statvfs()函數(shù) Unix/Linux
gtty()函數(shù) Unix/Linux
epoll_create()函數(shù) Unix/Linux
bind()函數(shù) Unix/Linux
inl_p()函數(shù) Unix/Linux
select_tut()函數(shù) Unix/Linux
mincore()函數(shù) Unix/Linux
getresuid()函數(shù) Unix/Linux
getpmsg()函數(shù) Unix/Linux
getcontext()函數(shù) Unix/Linux
killpg()函數(shù) Unix/Linux
olduname()函數(shù) Unix/Linux
openat()函數(shù) Unix/Linux
pause()函數(shù) Unix/Linux
alloc_hugepages()函數(shù) Unix/Linux
ioctl_list()函數(shù) Unix/Linux
readlinkat()函數(shù) Unix/Linux
mprotect()函數(shù) Unix/Linux
getdomainname()函數(shù) Unix/Linux
readlink()函數(shù) Unix/Linux
madvise()函數(shù) Unix/Linux
bdflush()函數(shù) Unix/Linux
ipc()函數(shù) Unix/Linux
ptrace()函數(shù) Unix/Linux
getrusage()函數(shù) Unix/Linux
msync()函數(shù) Unix/Linux
faccessat()函數(shù) Unix/Linux
modify_ldt()函數(shù) Unix/Linux
get_kernel_syms()函數(shù) Unix/Linux
getpid()函數(shù) Unix/Linux
fsync()函數(shù) Unix/Linux
msgctl()函數(shù) Unix/Linux
break未實現(xiàn) Unix/Linux
sched_setparam()函數(shù) Unix/Linux
fchown()函數(shù) Unix/Linux
cacheflush()函數(shù) Unix/Linux
fdatasync()函數(shù) Unix/Linux
flock()函數(shù) Unix/Linux
pivot_root()函數(shù) Unix/Linux
inotify_init()函數(shù) Unix/Linux
fchmodat()函數(shù) Unix/Linux
keyctl()函數(shù) Unix/Linux
llseek()函數(shù) Unix/Linux
outb()函數(shù) Unix/Linux
pipe()函數(shù) Unix/Linux
io_submit()函數(shù) Unix/Linux
ppoll()函數(shù) Unix/Linux
multiplexer()函數(shù) Unix/Linux
access()函數(shù) Unix/Linux
sched_getparam()函數(shù) Unix/Linux
chown()函數(shù) Unix/Linux
readdir()函數(shù) Unix/Linux
inb_p()函數(shù) Unix/Linux
outsl()函數(shù) Unix/Linux
nanosleep()函數(shù) Unix/Linux
alloc_hugepages()函數(shù) Unix/Linux
sbrk()函數(shù) Unix/Linux
move_pages()函數(shù) Unix/Linux
fchdir()函數(shù) Unix/Linux
renameat()函數(shù) Unix/Linux
getppid()函數(shù) Unix/Linux
getsid()函數(shù) Unix/Linux
oldfstat()函數(shù) Unix/Linux
lseek()函數(shù) Unix/Linux
stat()函數(shù) Unix/Linux
path_resolution()函數(shù) Unix/Linux
getunwind()函數(shù) Unix/Linux
getsockopt()函數(shù) Unix/Linux
mmap2()函數(shù) Unix/Linux
getdents()函數(shù) Unix/Linux
fchownat()函數(shù) Unix/Linux
mkdir()函數(shù) Unix/Linux
perfmonctl()函數(shù) Unix/Linux
open()函數(shù) Unix/Linux
idle()函數(shù) Unix/Linux
poll()函數(shù) Unix/Linux
brk()函數(shù) Unix/Linux
sched_setaffinity()函數(shù) Unix/Linux
mlockall()函數(shù) Unix/Linux

mprotect()函數(shù) Unix/Linux

mprotect - 控制允許訪問的內(nèi)存區(qū)域

內(nèi)容簡介

#include <sys/mman.h>

int mprotect(const void *addr, size_t len, int prot);

描述

The function mprotect() specifies the desired protection for the memory page(s) containing part or all of the interval [addr,addr+len-1]. If an access is disallowed by the protection given it, the program receives a SIGSEGV.

prot is a bitwise-or of the following values:

標簽 描述
PROT_NONE The memory cannot be accessed at all.
PROT_READ The memory can be read.
PROT_WRITE The memory can be written to.
PROT_EXEC The memory can contain executing code.
The new protection replaces any existing protection. For example, if the memory had previously been marked PROT_READ, and mprotect() is then called with protPROT_WRITE, it will no longer be readable.

返回值

On success, mprotect() returns zero. On error, -1 is returned, and errno is set appropriately.

錯誤

標簽 描述
EACCES The memory cannot be given the specified access. This can happen, for example, if you mmap(2) a file to which you have read-only access, then ask mprotect() to mark it PROT_WRITE.
EFAULT The memory cannot be accessed.
EINVAL addr is not a valid pointer, or not a multiple of PAGESIZE.
ENOMEM Internal kernel structures could not be allocated. Or: addresses in the range [addr, addr+len] are invalid for the address space of the process, or specify one or more pages that are not mapped.

實例：

#include <stdlib.h>
#include <errno.h>
#include <sys/mman.h>
#include 
#include 
#include 
#include 

#include     /* for PAGESIZE */
#ifndef PAGESIZE
#define PAGESIZE 4096
#endif

int
main(void)
{
    char *p;
    char c;

    /* Allocate a buffer; it will have the default
       protection of PROT_READ|PROT_WRITE. */
    p = malloc(1024+PAGESIZE-1);
    if (!p) {
        perror("Couldn’t malloc(1024)");
        exit(errno);
    }

    /* Align to a multiple of PAGESIZE, assumed to be a power of two */
    p = (char *)(((int) p + PAGESIZE-1) & ~(PAGESIZE-1));

    c = p[666];         /* Read; ok */
    p[666] = 42;        /* Write; ok */

    /* Mark the buffer read-only. */
    if (mprotect(p, 1024, PROT_READ)) {
        perror("Couldn’t mprotect");
        exit(errno);
    }
    c = p[666];         /* Read; ok */
    p[666] = 42;        /* Write; program dies on SIGSEGV */

    exit(0);
}

遵循于

SVr4, POSIX.1-2001. POSIX says that mprotect() can be used only on regions of memory obtained from mmap(2).

注意

On Linux it is always legal to call mprotect() on any address in a process’ address space (except for the kernel vsyscall area). In particular it can be used to change existing code mappings to be writable.

Whether PROT_EXEC has any effect different from PROT_READ is architecture and kernel version dependent.

另請參閱