pipe: replace PIPE_BUF macro pa pa_pipe_buf call

This should help portability to platforms that lack PIPE_BUF. Based on a
patch from Samuel Thibault.

See ticket #546

2 files changed, 19 insertions, 0 deletions

diff --git a/src/pulsecore/core-util.c b/src/pulsecore/core-util.c
index 5f777d5b..d01efa23 100644
--- a/src/pulsecore/core-util.c
+++ b/src/pulsecore/core-util.c
@@ -2779,3 +2779,19 @@ char* pa_maybe_prefix_path(const char *path, const char *prefix) {
 
     return pa_sprintf_malloc("%s" PA_PATH_SEP "%s", prefix, path);
 }
+
+size_t pa_pipe_buf(int fd) {
+
+#ifdef _PC_PIPE_BUF
+    long n;
+
+    if ((n = fpathconf(fd, _PC_PIPE_BUF)) >= 0)
+        return (size_t) n;
+#endif
+
+#ifdef PIPE_BUF
+    return PIPE_BUF;
+#else
+    return 4096;
+#endif
+}
diff --git a/src/pulsecore/core-util.h b/src/pulsecore/core-util.h
index 96a0480a..b5e8453b 100644
--- a/src/pulsecore/core-util.h
+++ b/src/pulsecore/core-util.h
@@ -236,4 +236,7 @@ char **pa_split_spaces_strv(const char *s);
 
 char* pa_maybe_prefix_path(const char *path, const char *prefix);
 
+/* Returns size of the specified pipe or 4096 on failure */
+size_t pa_pipe_buf(int fd);
+
 #endif