Changes

This page describes how the <code>exec</code> command in criu works.

{{Note|The exec action is in [[deprecation]] list and has been removed in [[Download/criu/3.0|3.0]]. [[Compel]] is the new way of doing tricks described below}}

== Description ==

== Description ==

* If an argument starts with '&', the rest of it is copied to the target task's address space (it's allocated by remotely calling the <code>mmap</code> syscall) and the pointer to this area is passed as the system call argument

* If an argument starts with '&', the rest of it is copied to the target task's address space (it's allocated by remotely calling the <code>mmap</code> syscall) and the pointer to this area is passed as the system call argument

* If an argument starts with '@', the rest of is is considered to be a size of a memory buffer, pointer to which is passed into a syscall and which contents is printed on the screen after the syscall returns. Note, that before pushing the argument into the syscall, the memory is ''not'' initialized.

* If an argument starts with '@', the rest of it is considered to be a size of a memory buffer, pointer to which is passed into a syscall and which contents is printed on the screen after the syscall returns. Note, that before pushing the argument into the syscall, the memory is ''not'' initialized.

* Otherwise, the argument is converted into an <code>unsigned long</code> number with <code>strtol</code> and passed to system call directly

* Otherwise, the argument is converted into an <code>unsigned long</code> number with <code>strtol</code> and passed to system call directly

# criu exec -t <pid> madvise <start> <lenght> <madvise-bits-value>

# criu exec -t <pid> madvise <start> <lenght> <madvise-bits-value>

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