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-rw-r--r--os-posix.c21
1 files changed, 21 insertions, 0 deletions
diff --git a/os-posix.c b/os-posix.c
index 612b641737..38c29d1afe 100644
--- a/os-posix.c
+++ b/os-posix.c
@@ -361,3 +361,24 @@ int qemu_eventfd(int fds[2])
return qemu_pipe(fds);
}
+
+int qemu_create_pidfile(const char *filename)
+{
+ char buffer[128];
+ int len;
+ int fd;
+
+ fd = qemu_open(filename, O_RDWR | O_CREAT, 0600);
+ if (fd == -1) {
+ return -1;
+ }
+ if (lockf(fd, F_TLOCK, 0) == -1) {
+ return -1;
+ }
+ len = snprintf(buffer, sizeof(buffer), "%ld\n", (long)getpid());
+ if (write(fd, buffer, len) != len) {
+ return -1;
+ }
+
+ return 0;
+}