1 files changed, 73 insertions, 0 deletions
diff --git a/src/libstddjb/child_spawn0.c b/src/libstddjb/child_spawn0.c
new file mode 100644
index 0000000..b96b2ef
--- /dev/null
+++ b/src/libstddjb/child_spawn0.c
@@ -0,0 +1,73 @@
+/* ISC license. */
+
+#include <skalibs/sysdeps.h>
+#include <sys/types.h>
+#include <errno.h>
+
+#ifdef SKALIBS_HASPOSIXSPAWN
+
+#include <spawn.h>
+#include <stdlib.h>
+#include <skalibs/config.h>
+#include <skalibs/env.h>
+
+pid_t child_spawn0 (char const *prog, char const *const *argv, char const *const *envp)
+{
+  pid_t pid ;
+  int e ;
+  int haspath = !!env_get("PATH") ;
+  if (!haspath && (setenv("PATH", SKALIBS_DEFAULTPATH, 0) < 0)) return 0 ;
+  e = posix_spawnp(&pid, prog, 0, 0, (char *const *)argv, (char *const *)envp) ;
+  if (!haspath) unsetenv("PATH") ;
+  return e ? (errno = e, 0) : pid ;
+}
+
+#else
+
+#include <unistd.h>
+#include <skalibs/allreadwrite.h>
+#include <skalibs/djbunix.h>
+
+pid_t child_spawn0 (char const *prog, char const *const *argv, char const *const *envp)
+{
+  int e ;
+  int p[2] ;
+  pid_t pid ;
+  if (pipecoe(p) < 0) return 0 ;
+  pid = fork() ;
+  if (pid < 0)
+  {
+    e = errno ;
+    fd_close(p[1]) ;
+    fd_close(p[0]) ;
+    errno = e ;
+    return 0 ;
+  }
+  if (pid)
+  {
+    fd_close(p[0]) ;
+    pathexec_run(prog, argv, envp) ;
+    e = errno ;
+    fd_write(p[1], (char *)&e, sizeof(e)) ;
+    _exit(127) ;
+  }
+  fd_close(p[1]) ;
+  p[1] = fd_read(p[0], (char *)&e, sizeof(e)) ;
+  if (p[1] < 0)
+  {
+    e = errno ;
+    fd_close(p[0]) ;
+    errno = e ;
+    return 0 ;
+  }
+  fd_close(p[0]) ;
+  if (p[1] == sizeof(e))
+  {
+    wait_pid(pid, &p[0]) ;
+    errno = e ;
+    return 0 ;
+  }
+  return pid ;
+}
+
+#endif