DragonFly On-Line Manual Pages
EXEC_SYS_REGISTER(2) DragonFly System Calls Manual EXEC_SYS_REGISTER(2)
NAME
exec_sys_register, exec_sys_unregister -- register/unregister for
resident execution
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <sys/resident.h>
int
exec_sys_register(void *entry);
int
exec_sys_unregister(int id);
DESCRIPTION
The exec_sys_register() system call registers the binary of the calling
process for resident execution. This snapshots the vmspace and causes
future exec()s of the specified binary to use the snapshot directly
rather than load and relocate a new copy.
The exec_sys_unregister() system call unregisters a resident binary
identified by id, or the binary of the calling process if id is -1 , or
all registered binaries if id is -2.
Both can only be done by the superuser.
RETURN VALUES
The exec_sys_register() and exec_sys_unregister() functions return the
value 0 if successful; otherwise the value -1 is returned and the global
variable errno is set to indicate the error.
ERRORS
The exec_sys_register() system call will fail if one of the following
occurs:
[EEXIST] The binary is already resident.
[ENOENT] No associated vnode exists.
[EPERM] The caller does not have sufficient permissions.
The exec_sys_unregister() system call will fail if one of the following
occurs:
[ENOENT] The specified id could not be found.
[EPERM] The caller does not have sufficient permissions.
SEE ALSO
resident(8)
HISTORY
The exec_sys_register and exec_sys_unregister system calls first appeared
in DragonFly 1.0.
AUTHORS
The exec_sys_register and exec_sys_unregister system calls were written
by Matthew Dillon and this manual page was written by Sascha Wildner.
DragonFly 4.3 March 7, 2016 DragonFly 4.3