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authorLudovic Courtès <ludo@gnu.org>2017-03-15 10:40:51 +0100
committerLudovic Courtès <ludo@gnu.org>2017-03-15 15:19:53 +0100
commit81a0f1cdf12e7bcc34c1203f034a323fa8f52cf5 (patch)
tree8060a793fb9709625095c18d36275a5c3dcf7d6c
parentbc551cf32b6ccb3f8dd60b1d0d4e3c3e88cb1f8d (diff)
zlib: Don't rely on EBADF being ignored by 'fport_close'.
In 2.2, 'fport_close' no longer swallows EBADF and instead raises a 'system-error' for this. This commit adjusts for 2.2. * guix/zlib.scm (close-procedure): Remove. (make-gzip-input-port): Use 'port->fdes' instead of 'fileno'. Use 'gzclose' instead of 'close-procedure'. (make-gzip-output-port): Likewise. * tests/zlib.scm ("compression/decompression pipe"): Don't check whether PARENT is closed using 'port-closed?'. Instead, use 'seek' on the underlying FD and check for EBADF.
-rw-r--r--guix/zlib.scm29
-rw-r--r--tests/zlib.scm11
2 files changed, 20 insertions, 20 deletions
diff --git a/guix/zlib.scm b/guix/zlib.scm
index 74420129f6..3d830ef84e 100644
--- a/guix/zlib.scm
+++ b/guix/zlib.scm
@@ -149,21 +149,6 @@ the number of uncompressed bytes written, a strictly positive integer."
;; Z_DEFAULT_COMPRESSION.
-1)
-(define (close-procedure gzfile port)
- "Return a procedure that closes GZFILE, ensuring its underlying PORT is
-closed even if closing GZFILE triggers an exception."
- (lambda ()
- (catch 'zlib-error
- (lambda ()
- ;; 'gzclose' closes the underlying file descriptor. 'close-port'
- ;; calls close(2), gets EBADF, which is ignores.
- (gzclose gzfile)
- (close-port port))
- (lambda args
- ;; Make sure PORT is closed despite the zlib error.
- (close-port port)
- (apply throw args)))))
-
(define* (make-gzip-input-port port #:key (buffer-size %default-buffer-size))
"Return an input port that decompresses data read from PORT, a file port.
PORT is automatically closed when the resulting port is closed. BUFFER-SIZE
@@ -173,7 +158,11 @@ buffered input, which would be lost (and is lost anyway)."
(define gzfile
(match (drain-input port)
("" ;PORT's buffer is empty
- (gzdopen (fileno port) "r"))
+ ;; Since 'gzclose' will eventually close the file descriptor beneath
+ ;; PORT, we increase PORT's revealed count and never call 'close-port'
+ ;; on PORT since we would get EBADF if 'gzclose' already closed it (on
+ ;; 2.0 EBADF is swallowed by 'fport_close' but on 2.2 it is raised).
+ (gzdopen (port->fdes port) "r"))
(_
;; This is unrecoverable but it's better than having the buffered input
;; be lost, leading to unclear end-of-file or corrupt-data errors down
@@ -188,7 +177,8 @@ buffered input, which would be lost (and is lost anyway)."
(gzbuffer! gzfile buffer-size))
(make-custom-binary-input-port "gzip-input" read! #f #f
- (close-procedure gzfile port)))
+ (lambda ()
+ (gzclose gzfile))))
(define* (make-gzip-output-port port
#:key
@@ -200,7 +190,7 @@ port is closed."
(define gzfile
(begin
(force-output port) ;empty PORT's buffer
- (gzdopen (fileno port)
+ (gzdopen (port->fdes port)
(string-append "w" (number->string level)))))
(define (write! bv start count)
@@ -210,7 +200,8 @@ port is closed."
(gzbuffer! gzfile buffer-size))
(make-custom-binary-output-port "gzip-output" write! #f #f
- (close-procedure gzfile port)))
+ (lambda ()
+ (gzclose gzfile))))
(define* (call-with-gzip-input-port port proc
#:key (buffer-size %default-buffer-size))
diff --git a/tests/zlib.scm b/tests/zlib.scm
index 5455240a71..f71609b7c5 100644
--- a/tests/zlib.scm
+++ b/tests/zlib.scm
@@ -57,7 +57,16 @@
(match (waitpid pid)
((_ . status)
(and (zero? status)
- (port-closed? parent)
+
+ ;; PORT itself isn't closed but its underlying file
+ ;; descriptor must have been closed by 'gzclose'.
+ (catch 'system-error
+ (lambda ()
+ (seek (fileno parent) 0 SEEK_CUR)
+ #f)
+ (lambda args
+ (= EBADF (system-error-errno args))))
+
(bytevector=? received data))))))))))))
(test-end)