diff options
Diffstat (limited to 'guix/build/syscalls.scm')
| -rw-r--r-- | guix/build/syscalls.scm | 137 |
1 files changed, 133 insertions, 4 deletions
diff --git a/guix/build/syscalls.scm b/guix/build/syscalls.scm index 2e37846ff0..b68c48a05a 100644 --- a/guix/build/syscalls.scm +++ b/guix/build/syscalls.scm @@ -21,10 +21,12 @@ (define-module (guix build syscalls) #:use-module (system foreign) #:use-module (rnrs bytevectors) + #:autoload (ice-9 binary-ports) (get-bytevector-n) #:use-module (srfi srfi-1) #: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 +128,23 @@ 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 + (read-utmpx-from-port . read-utmpx))) ;;; Commentary: ;;; @@ -900,6 +918,15 @@ bytevector BV at INDEX." ;; The most terrible interface, live from Scheme. (syscall->procedure int "ioctl" (list int unsigned-long '*))) +(define (bytes->string bytes) + "Read BYTES, a list of bytes, and return the null-terminated string decoded +from there, or #f if that would be an empty string." + (match (take-while (negate zero?) bytes) + (() + #f) + (non-zero + (list->string (map integer->char non-zero))))) + (define (bytevector->string-list bv stride len) "Return the null-terminated strings found in BV every STRIDE bytes. Read at most LEN bytes from BV." @@ -911,9 +938,7 @@ most LEN bytes from BV." (reverse result)) (_ (loop (drop bytes stride) - (cons (list->string (map integer->char - (take-while (negate zero?) bytes))) - result)))))) + (cons (bytes->string bytes) result)))))) (define* (network-interface-names #:optional sock) "Return the names of existing network interfaces. This is typically limited @@ -1480,4 +1505,108 @@ 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)))))) + +(define (read-utmpx-from-port port) + "Read a utmpx entry from PORT. Return either the EOF object or a utmpx +entry." + (match (get-bytevector-n port sizeof-utmpx) + ((? eof-object? eof) + eof) + ((? bytevector? bv) + (read-utmpx bv)))) + ;;; syscalls.scm ends here |