1 files changed, 102 insertions, 0 deletions
diff --git a/src/c_fork.c b/src/c_fork.c
index e222cda..7709bd6 100644
--- a/src/c_fork.c
+++ b/src/c_fork.c
@@ -1,3 +1,105 @@
+/*
+ * ========================
+ * =====    ===============
+ * ======  ================
+ * ======  ================
+ * ======  ====   ====   ==
+ * ======  ===     ==  =  =
+ * ======  ===  =  ==     =
+ * =  ===  ===  =  ==  ====
+ * =  ===  ===  =  ==  =  =
+ * ==     =====   ====   ==
+ * ========================
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ * Copyright (c) 2020 Joe
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the organization nor the
+ *    names of its contributors may be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY JOE ''AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL JOE BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * bsdsetsid: src/c_fork.c
+ * Thu Nov 26 22:12:40 CET 2020
+ * Joe
+ *
+ * The program's main fork(2).
+ */
+
+#include <errno.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
 #include <unistd.h>
 
 #include "c_bsdsetsid.h"
+
+void
+c_fork
+(const char*	argv[],
+ const char*	envp[],
+ bool_t			wopt)
+{
+	int sets_ret;
+	int exec_ret;
+	pid_t pid;
+
+	pid = fork();
+	if (pid == -1) {
+		dprintf(
+			STDERR_FILENO,
+			"%s: fork: %s\n",
+			C_PROGNAME,
+			strerror(errno)
+			);
+		exit(EXIT_FAILURE);
+	}
+	else if (pid == 0) {
+		sets_ret = setsid();
+		if (sets_ret == -1) {
+			dprintf(
+				STDERR_FILENO,
+				"%s: setsid: %s\n",
+				C_PROGNAME,
+				strerror(errno)
+				);
+			exit(EXIT_FAILURE);
+		}
+		exec_ret = execve(
+			argv[1 + wopt],
+			(char* const*)argv + (1 + wopt),
+			(char* const*)envp
+			);
+		if (exec_ret == -1) {
+			dprintf(
+				STDERR_FILENO,
+				"%s: execve: %s\n",
+				C_PROGNAME,
+				strerror(errno)
+				);
+			exit(EXIT_FAILURE);
+		}
+	}
+	else {
+		exit(EXIT_SUCCESS);
+	}
+}