jfropts=mem is supported on Linux only

README.md

@@ -455,9 +455,10 @@ $ asprof -d 30 -f /tmp/flamegraph.html 8983
   only events between the safepoint request and the start of the VM operation
   will be recorded.
 
-* `--jfropts OPTIONS` - comma separated list of JFR recording options. The only
-  option currently supported is `mem`: accumulate events in memory instead of
-  flushing synchronously to a file.
+* `--jfropts OPTIONS` - comma separated list of JFR recording options.
+  Currently, the only available option is `mem` supported on Linux 3.17+.
+  `mem` enables accumulating events in memory instead of flushing
+  synchronously to a file.
 
 * `--jfrsync CONFIG` - start Java Flight Recording with the given configuration
   synchronously with the profiler. The output .jfr file will include all regular

src/os_macos.cpp

@@ -16,7 +16,6 @@
 #include <sys/sysctl.h>
 #include <sys/time.h>
 #include <sys/times.h>
-#include <stdio.h>
 #include <time.h>
 #include <unistd.h>
 #include "os.h"
@@ -328,13 +327,8 @@ u64 OS::getTotalCpuTime(u64* utime, u64* stime) {
 }
 
 int OS::createMemoryFile(const char* name) {
-    char buf[128];
-    snprintf(buf, sizeof(buf), "%.100s.%d", name, processId());
-    int fd = shm_open(buf, O_RDWR | O_CREAT | O_TRUNC, 0600);
-    if (fd >= 0) {
-        shm_unlink(buf);
-    }
-    return fd;
+    // Not supported on macOS
+    return -1;
 }
 
 void OS::copyFile(int src_fd, int dst_fd, off_t offset, size_t size) {