09-05-2015
The Way Systemd Handles System Calls
Hi everyone, I have a question about the process management, and deep level system functionality of system calls between SystemD and SystemV? Does SystemD use the same system calls (fork(), exec(), bind() etc...) as SystemV? or Vice Versa? If they both use the same or very very similar sys calls, do they handle them the same way? If a sys call is made in systemd, is it generally handled the same way on sysv? I know SystemD uses unit files for processes now, do these come into effect with system calls? Or are the differences between SystemV and SystemD more "higher level" than the low kernel level sys calls?
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IOPL(2) Linux Programmer's Manual IOPL(2)
NAME
iopl - change I/O privilege level
SYNOPSIS
#include <sys/io.h>
int iopl(int level);
DESCRIPTION
iopl changes the I/O privilege level of the current process, as specified in level.
This call is necessary to allow 8514-compatible X servers to run under Linux. Since these X servers require access to all 65536 I/O ports,
the ioperm call is not sufficient.
In addition to granting unrestricted I/O port access, running at a higher I/O privilege level also allows the process to disable inter-
rupts. This will probably crash the system, and is not recommended.
Permissions are inherited by fork and exec.
The I/O privilege level for a normal process is 0.
RETURN VALUE
On success, zero is returned. On error, -1 is returned, and errno is set appropriately.
ERRORS
EINVAL level is greater than 3.
EPERM The current user is not the super-user.
CONFORMING TO
iopl is Linux specific and should not be used in processes intended to be portable.
NOTES
Libc5 treats it as a system call and has a prototype in <unistd.h>. Glibc1 does not have a prototype. Glibc2 has a prototype both in
<sys/io.h> and in <sys/perm.h>. Avoid the latter, it is available on i386 only.
SEE ALSO
ioperm(2)
Linux 0.99.11 1993-07-24 IOPL(2)