From 8e8d652a5461a4616c680ae96ffc5b1fc0b40188 Mon Sep 17 00:00:00 2001
From: Laurent Bercot <ska-skaware@skarnet.org>
Date: Tue, 12 Sep 2023 03:36:09 +0000
Subject:  Defork s6-fghack

Signed-off-by: Laurent Bercot <ska@appnovation.com>
---
 src/daemontools-extras/deps-exe/s6-fghack |  1 +
 src/daemontools-extras/s6-fghack.c        | 67 +++++++++----------------------
 2 files changed, 20 insertions(+), 48 deletions(-)

(limited to 'src/daemontools-extras')

diff --git a/src/daemontools-extras/deps-exe/s6-fghack b/src/daemontools-extras/deps-exe/s6-fghack
index e7187fe..39597dd 100644
--- a/src/daemontools-extras/deps-exe/s6-fghack
+++ b/src/daemontools-extras/deps-exe/s6-fghack
@@ -1 +1,2 @@
 -lskarnet
+${SPAWN_LIB}
diff --git a/src/daemontools-extras/s6-fghack.c b/src/daemontools-extras/s6-fghack.c
index c90792a..fec2962 100644
--- a/src/daemontools-extras/s6-fghack.c
+++ b/src/daemontools-extras/s6-fghack.c
@@ -7,63 +7,34 @@
 #include <skalibs/strerr.h>
 #include <skalibs/allreadwrite.h>
 #include <skalibs/djbunix.h>
-#include <skalibs/exec.h>
+#include <skalibs/cspawn.h>
 
 #define USAGE "s6-fghack prog..."
 
-int main (int argc, char const *const *argv)
+#define N 30
+
+int main (int argc, char const *const *argv, char const *const *envp)
 {
   int p[2] ;
-  int pcoe[2] ;
+  int fds[N] ;
   pid_t pid ;
-  char dummy ;
+  cspawn_fileaction fa = { .type = CSPAWN_FA_CLOSE } ;
+  char c ;
+
   PROG = "s6-fghack" ;
   if (argc < 2) strerr_dieusage(100, USAGE) ;
-  if (pipe(p) < 0) strerr_diefu1sys(111, "create hackpipe") ;
-  if (pipe(pcoe) < 0) strerr_diefu1sys(111, "create coepipe") ;
-
-  switch (pid = fork())
-  {
-    case -1 : strerr_diefu1sys(111, "fork") ;
-    case 0 :
-    {
-      int i = 0 ;
-      close(p[0]) ;
-      close(pcoe[0]) ;
-      if (coe(pcoe[1]) < 0) _exit(111) ;
-      for (; i < 30 ; i++) dup(p[1]) ; /* hack. gcc's warning is justified. */
-      exec(argv+1) ;
-      i = errno ;
-      if (fd_write(pcoe[1], "", 1) < 1) _exit(111) ;
-      _exit(i) ;
-    }
-  }
-
+  if (pipe(p) == -1) strerr_diefu1sys(111, "create hackpipe") ;
+  for (size_t i = 0 ; i < N ; i++)
+    fds[i] = dup(p[1]) ;
+  fa.x.fd = p[0] ;
+  pid = cspawn(argv[1], argv + 1, envp, 0, &fa, 1) ;
+  if (!pid) strerr_diefu2sys(111, "spawn ", argv[1]) ;
   close(p[1]) ;
-  close(pcoe[1]) ;
+  for (size_t i = 0 ; i < N ; i++) close(fds[i]) ;
 
-  switch (fd_read(pcoe[0], &dummy, 1))
-  {
-    case -1 : strerr_diefu1sys(111, "read on coepipe") ;
-    case 1 :
-    {
-      int wstat ;
-      if (wait_pid(pid, &wstat) < 0) strerr_diefu1sys(111, "wait_pid") ;
-      errno = WEXITSTATUS(wstat) ;
-      strerr_dieexec(111, argv[1]) ;
-    }
-  }
-
-  fd_close(pcoe[0]) ;
-
-  p[1] = fd_read(p[0], &dummy, 1) ;
-  if (p[1] < 0) strerr_diefu1sys(111, "read on hackpipe") ;
+  p[1] = fd_read(p[0], &c, 1) ;
+  if (p[1] == -1) strerr_diefu1sys(111, "read on hackpipe") ;
   if (p[1]) strerr_dief2x(102, argv[1], " wrote on hackpipe") ;
-
-  {
-    int wstat ;
-    if (wait_pid(pid, &wstat) < 0) strerr_diefu1sys(111, "wait_pid") ;
-    if (WIFSIGNALED(wstat)) strerr_dief2x(111, argv[2], " crashed") ;
-    return WEXITSTATUS(wstat) ;
-  }
+  if (wait_pid(pid, &p[1]) < 0) strerr_diefu1sys(111, "wait_pid") ;
+  return wait_estatus(p[1]) ;
 }
-- 
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