Add waitn_posix() and waitn_reap_posix()

Signed-off-by: Laurent Bercot <ska@appnovation.com>

1 files changed, 22 insertions, 0 deletions

diff --git a/src/libstddjb/waitn_reap_posix.c b/src/libstddjb/waitn_reap_posix.c
new file mode 100644
index 0000000..4a6994f
--- /dev/null
+++ b/src/libstddjb/waitn_reap_posix.c
@@ -0,0 +1,22 @@
+/* ISC license. */
+
+#include <sys/wait.h>
+
+#include <skalibs/djbunix.h>
+
+int waitn_reap_posix (pid_t *pids, unsigned int len, int *w)
+{
+  pid_t wanted = len ? pids[len-1] : 0 ;
+  unsigned int n = 0 ;
+  while (len)
+  {
+    int wstat ;
+    int r = wait_pids_nohang(pids, len, &wstat) ;
+    if (r < 0) return r ;
+    else if (!r) break ;
+    if (pids[r-1] == wanted) *w = wstat ;
+    pids[r-1] = pids[--len] ;
+    n++ ;
+  }
+  return n ;
+}