From 4cce87557feb6933c284d234c448bd8bde4facae Mon Sep 17 00:00:00 2001
From: Laurent Bercot <ska-skaware@skarnet.org>
Date: Sat, 9 Sep 2023 03:55:38 +0000
Subject:  cspawn revamp, part 1. Prepare for 2.14.0.0.

Signed-off-by: Laurent Bercot <ska@appnovation.com>
---
 src/libstddjb/child_spawn1_internal.c | 131 +++-------------------------------
 1 file changed, 9 insertions(+), 122 deletions(-)

(limited to 'src/libstddjb/child_spawn1_internal.c')

diff --git a/src/libstddjb/child_spawn1_internal.c b/src/libstddjb/child_spawn1_internal.c
index 9e6eeff..e65b588 100644
--- a/src/libstddjb/child_spawn1_internal.c
+++ b/src/libstddjb/child_spawn1_internal.c
@@ -1,140 +1,27 @@
 /* ISC license. */
 
-#include <skalibs/sysdeps.h>
-
-#include <errno.h>
-
 #include <skalibs/djbunix.h>
-
-#ifdef SKALIBS_HASPOSIXSPAWN
-
-#include <signal.h>
-#include <spawn.h>
-#include <stdlib.h>
-
-#include <skalibs/config.h>
+#include <skalibs/cspawn.h>
+#include "cspawn-internal.h"
 
 pid_t child_spawn1_internal (char const *prog, char const *const *argv, char const *const *envp, int *p, int to)
 {
   pid_t pid ;
-  posix_spawn_file_actions_t actions ;
-  posix_spawnattr_t attr ;
-  sigset_t set ;
-  int e ;
-  int nopath = !getenv("PATH") ;
-
-#ifdef SKALIBS_HASPOSIXSPAWNEARLYRETURN
-  int syncpipe[2] ;
-  if (pipecoe(syncpipe) == -1) goto err ;
-#endif
-
-  if (coe(p[!(to & 1)]) == -1) goto errp ;
-  e = posix_spawnattr_init(&attr) ;
-  if (e) goto erre ;
-  sigemptyset(&set) ;
-  e = posix_spawnattr_setsigmask(&attr, &set) ;
-  if (e) goto errattr ;
-  e = posix_spawnattr_setflags(&attr, POSIX_SPAWN_SETSIGMASK) ;
-  if (e) goto errattr ;
-  e = posix_spawn_file_actions_init(&actions) ;
-  if (e) goto errattr ;
-  if (p[to & 1] != (to & 1))
-  {
-    e = posix_spawn_file_actions_adddup2(&actions, p[to & 1], to & 1) ;
-    if (e) goto erractions ;
-    e = posix_spawn_file_actions_addclose(&actions, p[to & 1]) ;
-    if (e) goto erractions ;
-  }
-  if (to & 2)
+  cspawn_fileaction fa[3] =
   {
-    e = posix_spawn_file_actions_adddup2(&actions, to & 1, !(to & 1)) ;
-    if (e) goto erractions ;
-  }
-  if (nopath && (setenv("PATH", SKALIBS_DEFAULTPATH, 0) < 0)) { e = errno ; goto erractions ; }
-  e = posix_spawnp(&pid, prog, &actions, &attr, (char *const *)argv, (char *const *)envp) ;
-  if (nopath) unsetenv("PATH") ;
-  if (e) goto erractions ;
+    [0] = { .type = CSPAWN_FA_CLOSE, .x = { .fd = p[!(to & 1)]} },
+    [1] = { .type = CSPAWN_FA_MOVE, .x = { .fd2 = { [0] = to & 1, [1] = p[to & 1] } } },
+    [2] = { .type = CSPAWN_FA_COPY, .x = { .fd2 = { [0] = !(to & 1), [1] = to & 1 } } }
+  } ;
 
-  posix_spawn_file_actions_destroy(&actions) ;
-  posix_spawnattr_destroy(&attr) ;
-  fd_close(p[to & 1]) ;
-
-#ifdef SKALIBS_HASPOSIXSPAWNEARLYRETURN
-  return child_spawn_workaround(pid, syncpipe) ;
-#else
-  return pid ;
-#endif
+  pid = cspawn(prog, argv, envp, CSPAWN_FLAGS_SIGBLOCKNONE, fa, 2 + !!(to & 2)) ;
+  if (!pid) goto err ;
 
- erractions:
-  posix_spawn_file_actions_destroy(&actions) ;
- errattr:
-  posix_spawnattr_destroy(&attr) ;
- erre:
-  errno = e ;
- errp:
-#ifdef SKALIBS_HASPOSIXSPAWNEARLYRETURN
-  fd_close(syncpipe[1]) ;
-  fd_close(syncpipe[0]) ;
- err:
-#endif
-  fd_close(p[1]) ;
-  fd_close(p[0]) ;
-  return 0 ;
-}
-
-#else
-
-#include <unistd.h>
-
-#include <skalibs/allreadwrite.h>
-#include <skalibs/sig.h>
-#include <skalibs/exec.h>
-
-pid_t child_spawn1_internal (char const *prog, char const *const *argv, char const *const *envp, int *p, int to)
-{
-  pid_t pid ;
-  int syncpipe[2] ;
-  char c ;
-
-  if (coe(p[0]) < 0 || pipecoe(syncpipe) < 0) goto err ;
-
-  pid = fork() ;
-  if (pid < 0) goto errsp ;
-  if (!pid)
-  {
-    fd_close(p[!(to & 1)]) ;
-    if (fd_move(to & 1, p[to & 1]) < 0) goto syncdie ;
-    if ((to & 2) && (fd_copy(!(to & 1), to & 1) < 0)) goto syncdie ;
-    sig_blocknone() ;
-    exec_ae(prog, argv, envp) ;
-   syncdie:
-    c = errno ;
-    fd_write(syncpipe[1], &c, 1) ;
-    _exit(127) ;
-  }
-
-  fd_close(syncpipe[1]) ;
-  syncpipe[1] = fd_read(syncpipe[0], &c, 1) ;
-  if (syncpipe[1])
-  {
-    int e = (unsigned char)c ;
-    if (syncpipe[1] == -1) e = errno ;
-    if (wait_pid(pid, 0) == -1) e = errno ;
-    errno = e ;
-    goto errsp0 ;
-  }
-  fd_close(syncpipe[0]) ;
   fd_close(p[to & 1]) ;
   return pid ;
 
- errsp:
-  fd_close(syncpipe[1]) ;
- errsp0:
-  fd_close(syncpipe[0]) ;
  err:
   fd_close(p[1]) ;
   fd_close(p[0]) ;
   return 0 ;
 }
-
-#endif
-- 
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