07-10-2001
How to find the size of Process Address space.
Hello,
Please help me to know, How to find out the how much amount of process addres space is required/is used for/by a process.
Tnx & Regards
Vishwa.
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LEARN ABOUT OSF1
mlockall
mlockall(3) Library Functions Manual mlockall(3)
NAME
mlockall, munlockall - Locks into memory, or unlocks, all of a specified process's pages (P1003.1b)
LIBRARY
Realtime Library (librt.so, librt.a)
SYNOPSIS
#include <sys/mman.h>
int mlockall (
int flags);
int munlockall (void);
PARAMETERS
flags Determines whether the pages to be locked are those currently mapped by the process's address space, those that will be mapped in
the future, or both. The flags argument is constructed as the OR of one or more of the constants, MCL_CURRENT or MCL_FUTURE, as
defined in the <mman.h> header file.
DESCRIPTION
The mlockall function causes all of the pages mapped by the process's address space to be memory resident until unlocked by a call to the
munlockall function, until the process exits, or until the process calls exec. MCL_CURRENT locks all of the pages currently mapped into
the process's address space. MCL_FUTURE locks all of the pages that become mapped into the process's address space in the future, when
those mappings are established. You can specify MCL_CURRENT and subsequently specify MCL_FUTURE to lock both current and future address
space.
The munlockall function unlocks all currently mapped pages of the process's address space. Any pages that become mapped into a process's
address space after a call to munlockall are not locked unless otherwise specified by a subsequent call to mlockall. Pages locked or mapped
into another process's address space are unaffected by this process's call to the munlockall function.
Locking the process's pages into memory also makes the process unswappable. When the pages are unlocked, the process is made swappable.
A lock is not inherited across a fork. All memory locks established on an address by this process are removed if an address range associ-
ated with the lock is unmapped with a call to the munmap function.
You must have superuser privileges to call the mlockall function.
RETURN VALUES
On a successful call to the mlockall function, a value of 0 (zero) is returned and memory is locked. On an unsuccessful call, a value of
-1 is returned, no memory is locked, and errno is set to indicate that an error occurred.
On a successful call to the munlockall function, a value of 0 (zero) is returned and memory is unlocked. On an unsuccessful call, a value
of -1 is returned and errno is set to indicate that an error occurred.
ERRORS
The mlockall and munlockall functions fail under the following condition:
[ENOSYS] The implementation does not support this memory locking interface.
If any of the following conditions occur, the mlockall function fails:
[EAGAIN] Some or all of the memory identified by the operation could not be locked when the call was made.
[EINVAL] The flags argument is zero or includes unimplemented flags.
[ENOMEM] Locking all of the pages currently mapped into the process's address space exceeds an implementation-defined limit on the
amount of memory that the process may lock.
[EPERM] The calling process does not have the appropriate privilege to perform the requested operation.
RELATED INFORMATION
Functions: exec(2), _exit(2), fork(2), munmap(2)
Guide to Realtime Programming delim off
mlockall(3)