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authorLudovic Courtès <ludo@gnu.org>2017-01-19 23:21:25 +0100
committerLudovic Courtès <ludo@gnu.org>2017-01-19 23:21:25 +0100
commit150309726f221c9b982e594466d35f5b895391d5 (patch)
treec5a90ba7c20b498378f69dd4668e120e258e413c /guix
parent57f068bec5349e250ce321262609ca8978a81f7f (diff)
syscalls: Add utmpx procedures and data structure.
* guix/build/syscalls.scm (<utmpx-entry>): New record type. (%utmpx): New C struct. (login-type): New bits. (setutxent, endutxent, getutxent, utmpx-entries): New procedures.
Diffstat (limited to 'guix')
-rw-r--r--guix/build/syscalls.scm113
1 files changed, 112 insertions, 1 deletions
diff --git a/guix/build/syscalls.scm b/guix/build/syscalls.scm
index c06013cd08..475fc96490 100644
--- a/guix/build/syscalls.scm
+++ b/guix/build/syscalls.scm
@@ -25,6 +25,7 @@
#:use-module (srfi srfi-9)
#:use-module (srfi srfi-9 gnu)
#:use-module (srfi srfi-11)
+ #:use-module (srfi srfi-19)
#:use-module (ice-9 rdelim)
#:use-module (ice-9 regex)
#:use-module (ice-9 match)
@@ -126,7 +127,22 @@
window-size-x-pixels
window-size-y-pixels
terminal-window-size
- terminal-columns))
+ terminal-columns
+
+ utmpx?
+ utmpx-login-type
+ utmpx-pid
+ utmpx-line
+ utmpx-id
+ utmpx-user
+ utmpx-host
+ utmpx-termination-status
+ utmpx-exit-status
+ utmpx-session-id
+ utmpx-time
+ utmpx-address
+ login-type
+ utmpx-entries))
;;; Commentary:
;;;
@@ -1487,4 +1503,99 @@ always a positive integer."
(fall-back)
(apply throw args))))))
+
+;;;
+;;; utmpx.
+;;;
+
+(define-record-type <utmpx-entry>
+ (utmpx type pid line id user host termination exit
+ session time address)
+ utmpx?
+ (type utmpx-login-type) ;login-type
+ (pid utmpx-pid)
+ (line utmpx-line) ;device name
+ (id utmpx-id)
+ (user utmpx-user) ;user name
+ (host utmpx-host) ;host name | #f
+ (termination utmpx-termination-status)
+ (exit utmpx-exit-status)
+ (session utmpx-session-id) ;session ID, for windowing
+ (time utmpx-time) ;entry time
+ (address utmpx-address))
+
+(define-c-struct %utmpx ;<utmpx.h>
+ sizeof-utmpx
+ (lambda (type pid line id user host termination exit session
+ seconds useconds address %reserved)
+ (utmpx type pid
+ (bytes->string line) id
+ (bytes->string user)
+ (bytes->string host) termination exit
+ session
+ (make-time time-utc (* 1000 useconds) seconds)
+ address))
+ read-utmpx
+ write-utmpx!
+ (type short)
+ (pid int)
+ (line (array uint8 32))
+ (id (array uint8 4))
+ (user (array uint8 32))
+ (host (array uint8 256))
+ (termination short)
+ (exit short)
+ (session int32)
+ (time-seconds int32)
+ (time-useconds int32)
+ (address-v6 (array int32 4))
+ (%reserved (array uint8 20)))
+
+(define-bits login-type
+ %unused-login-type->symbols
+ (define EMPTY 0) ;No valid user accounting information.
+ (define RUN_LVL 1) ;The system's runlevel.
+ (define BOOT_TIME 2) ;Time of system boot.
+ (define NEW_TIME 3) ;Time after system clock changed.
+ (define OLD_TIME 4) ;Time when system clock changed.
+
+ (define INIT_PROCESS 5) ;Process spawned by the init process.
+ (define LOGIN_PROCESS 6) ;Session leader of a logged in user.
+ (define USER_PROCESS 7) ;Normal process.
+ (define DEAD_PROCESS 8) ;Terminated process.
+
+ (define ACCOUNTING 9)) ;System accounting.
+
+(define setutxent
+ (let ((proc (syscall->procedure void "setutxent" '())))
+ (lambda ()
+ "Open the user accounting database."
+ (proc))))
+
+(define endutxent
+ (let ((proc (syscall->procedure void "endutxent" '())))
+ (lambda ()
+ "Close the user accounting database."
+ (proc))))
+
+(define getutxent
+ (let ((proc (syscall->procedure '* "getutxent" '())))
+ (lambda ()
+ "Return the next entry from the user accounting database."
+ (let ((ptr (proc)))
+ (if (null-pointer? ptr)
+ #f
+ (read-utmpx (pointer->bytevector ptr sizeof-utmpx)))))))
+
+(define (utmpx-entries)
+ "Return the list of entries read from the user accounting database."
+ (setutxent)
+ (let loop ((entries '()))
+ (match (getutxent)
+ (#f
+ (endutxent)
+ (reverse entries))
+ ((? utmpx? entry)
+ (loop (cons entry entries))))))
+
;;; syscalls.scm ends here