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-rw-r--r--guix/build/syscalls.scm13
-rw-r--r--tests/syscalls.scm9
2 files changed, 21 insertions, 1 deletions
diff --git a/guix/build/syscalls.scm b/guix/build/syscalls.scm
index 475fc96490..b68c48a05a 100644
--- a/guix/build/syscalls.scm
+++ b/guix/build/syscalls.scm
@@ -21,6 +21,7 @@
(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)
@@ -142,7 +143,8 @@
utmpx-time
utmpx-address
login-type
- utmpx-entries))
+ utmpx-entries
+ (read-utmpx-from-port . read-utmpx)))
;;; Commentary:
;;;
@@ -1598,4 +1600,13 @@ always a positive integer."
((? 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
diff --git a/tests/syscalls.scm b/tests/syscalls.scm
index fb2c8e7100..92e02f3303 100644
--- a/tests/syscalls.scm
+++ b/tests/syscalls.scm
@@ -452,6 +452,15 @@
#t)))
entries))))
+(test-assert "read-utmpx, EOF"
+ (eof-object? (read-utmpx (%make-void-port "r"))))
+
+(unless (access? "/var/run/utmpx" O_RDONLY)
+ (tes-skip 1))
+(test-assert "read-utmpx"
+ (let ((result (call-with-input-file "/var/run/utmpx" read-utmpx)))
+ (or (utmpx? result) (eof-object? result))))
+
(test-end)
(false-if-exception (delete-file temp-file))