Add waitn_posix() and waitn_reap_posix()

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

1 files changed, 21 insertions, 0 deletions

diff --git a/src/libstddjb/waitn_posix.c b/src/libstddjb/waitn_posix.c
new file mode 100644
index 0000000..ea5935d
--- /dev/null
+++ b/src/libstddjb/waitn_posix.c
@@ -0,0 +1,21 @@
+/* ISC license. */
+
+#include <sys/wait.h>
+
+#include <skalibs/djbunix.h>
+
+int waitn_posix (pid_t *pids, unsigned int n, int *w)
+{
+  pid_t wanted = n ? pids[n-1] : 0 ;
+  while (n)
+  {
+    int wstat ;
+    unsigned int i = 0 ;
+    pid_t pid = wait_nointr(&wstat) ;
+    if (pid < 0) return 0 ;
+    for (; i < n ; i++) if (pid == pids[i]) break ;
+    if (i < n) pids[i] = pids[--n] ;
+    if (pid == wanted) *w = wstat ;
+  }
+  return 1 ;
+}