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mprotect (2)
  • >> mprotect (2) ( Solaris man: Системные вызовы )
  • mprotect (2) ( FreeBSD man: Системные вызовы )
  • mprotect (2) ( Русские man: Системные вызовы )
  • mprotect (2) ( Linux man: Системные вызовы )
  • mprotect (3) ( POSIX man: Библиотечные вызовы )
  •  

    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 specified by prot. 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 protections of all whole pages in the range [addr, addr2] will have been modified.  

    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.

    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 insufficient 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(5) for descriptions of the following attributes:

    ATTRIBUTE TYPEATTRIBUTE VALUE

    Interface StabilityStandard

     

    SEE ALSO

    mmap(2), plock(3C), mlock(3C), mlockall(3C), sysconf(3C), attributes(5), standards(5)


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    RETURN VALUES
    ERRORS
    ATTRIBUTES
    SEE ALSO


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