The R13B03 release.OTP_R13B03

1 files changed, 122 insertions, 0 deletions

diff --git a/erts/emulator/sys/unix/erl_child_setup.c b/erts/emulator/sys/unix/erl_child_setup.c
new file mode 100644
index 0000000000..7c6e4a2f37
--- /dev/null
+++ b/erts/emulator/sys/unix/erl_child_setup.c
@@ -0,0 +1,122 @@
+/*
+ * %CopyrightBegin%
+ * 
+ * Copyright Ericsson AB 2002-2009. All Rights Reserved.
+ * 
+ * The contents of this file are subject to the Erlang Public License,
+ * Version 1.1, (the "License"); you may not use this file except in
+ * compliance with the License. You should have received a copy of the
+ * Erlang Public License along with this software. If not, it can be
+ * retrieved online at http://www.erlang.org/.
+ * 
+ * Software distributed under the License is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+ * the License for the specific language governing rights and limitations
+ * under the License.
+ * 
+ * %CopyrightEnd%
+ */
+
+/*
+ * After a vfork() (or fork()) the child exec()s to this program which
+ * sets up the child and exec()s to the user program (see spawn_start()
+ * in sys.c and ticket OTP-4389).
+ */
+
+#ifdef HAVE_CONFIG_H
+#  include "config.h"
+#endif
+
+#define NEED_CHILD_SETUP_DEFINES
+#include "sys.h"
+#include "erl_misc_utils.h"
+
+#ifdef SIG_SIGSET		/* Old SysV */
+void sys_sigrelease(int sig)
+{
+    sigrelse(sig);
+}
+#else /* !SIG_SIGSET */
+#ifdef SIG_SIGNAL		/* Old BSD */
+sys_sigrelease(int sig)
+{
+    sigsetmask(sigblock(0) & ~sigmask(sig));
+}
+#else /* !SIG_SIGNAL */	/* The True Way - POSIX!:-) */
+void sys_sigrelease(int sig)
+{
+    sigset_t mask;
+
+    sigemptyset(&mask);
+    sigaddset(&mask, sig);
+    sigprocmask(SIG_UNBLOCK, &mask, (sigset_t *)NULL);
+}
+#endif /* !SIG_SIGNAL */
+#endif /* !SIG_SIGSET */
+
+int
+main(int argc, char *argv[])
+{
+    int i, from, to;
+    int erts_spawn_executable = 0;
+
+    /* OBSERVE!
+     * Keep child setup after fork() (implemented in sys.c) up to date
+     * if changes are made here.
+     */
+
+    if (argc != CS_ARGV_NO_OF_ARGS) {
+	if (argc < CS_ARGV_NO_OF_ARGS) {
+	    return 1;
+	} else {
+	    erts_spawn_executable = 1;
+	}
+    }
+
+    if (strcmp("false", argv[CS_ARGV_UNBIND_IX]) != 0)
+	if (erts_unbind_from_cpu_str(argv[CS_ARGV_UNBIND_IX]) != 0)
+	    return 1;
+
+    for (i = 0; i < CS_ARGV_NO_OF_DUP2_OPS; i++) {
+	if (argv[CS_ARGV_DUP2_OP_IX(i)][0] == '-'
+	    && argv[CS_ARGV_DUP2_OP_IX(i)][1] == '\0')
+	    break;
+	if (sscanf(argv[CS_ARGV_DUP2_OP_IX(i)], "%d:%d", &from, &to) != 2)
+	    return 1;
+	if (dup2(from, to) < 0)
+	    return 1;
+    }
+
+    if (sscanf(argv[CS_ARGV_FD_CR_IX], "%d:%d", &from, &to) != 2)
+	return 1;
+    for (i = from; i <= to; i++)
+	(void) close(i);
+
+    if (!(argv[CS_ARGV_WD_IX][0] == '.' && argv[CS_ARGV_WD_IX][1] == '\0')
+	&& chdir(argv[CS_ARGV_WD_IX]) < 0)
+	return 1;
+
+#if defined(USE_SETPGRP_NOARGS)		/* SysV */
+    (void) setpgrp();
+#elif defined(USE_SETPGRP)		/* BSD */
+    (void) setpgrp(0, getpid());
+#else					/* POSIX */
+    (void) setsid();
+#endif
+
+    sys_sigrelease(SIGCHLD);
+    sys_sigrelease(SIGINT);
+    sys_sigrelease(SIGUSR1);
+
+    if (erts_spawn_executable) {
+	if (argv[CS_ARGV_NO_OF_ARGS + 1] == NULL) {
+	    execl(argv[CS_ARGV_NO_OF_ARGS],argv[CS_ARGV_NO_OF_ARGS],
+		  (char *) NULL);
+	} else {
+	    execv(argv[CS_ARGV_NO_OF_ARGS],&(argv[CS_ARGV_NO_OF_ARGS + 1]));
+	}
+    } else {
+	execl("/bin/sh", "sh", "-c", argv[CS_ARGV_CMD_IX], (char *) NULL);
+    }
+    return 1;
+}