From 61a0d117878ace757d62b4af35fcc8de5b981a34 Mon Sep 17 00:00:00 2001
From: JozanLeClerc <JozanLeClerc@noemail.net>
Date: Thu, 26 Nov 2020 22:49:44 +0000
Subject: In progress

FossilOrigin-Name: c044b82560a01287a9c768217a04c79b04f39e77
---
 src/c_fork.c | 100 ++++++++++++++++++++++++++++++++++++++++++-----------------
 src/c_fork.h |   9 +++++-
 2 files changed, 80 insertions(+), 29 deletions(-)

diff --git a/src/c_fork.c b/src/c_fork.c
index 7709bd6..b74d8bc 100644
--- a/src/c_fork.c
+++ b/src/c_fork.c
@@ -39,12 +39,17 @@
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  * bsdsetsid: src/c_fork.c
- * Thu Nov 26 22:12:40 CET 2020
+ * Thu Nov 26 23:40:15 CET 2020
  * Joe
  *
  * The program's main fork(2).
  */
 
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <sys/time.h>
+#include <sys/resource.h>
+
 #include <errno.h>
 #include <stdlib.h>
 #include <stdio.h>
@@ -52,54 +57,93 @@
 #include <unistd.h>
 
 #include "c_bsdsetsid.h"
+#include "c_fork.h"
 
-void
-c_fork
+static void
+c_fork_child
 (const char*	argv[],
  const char*	envp[],
  bool_t			wopt)
 {
-	int sets_ret;
-	int exec_ret;
-	pid_t pid;
+	union ret_u u;
 
-	pid = fork();
-	if (pid == -1) {
+	u.pid = setsid();
+	if (u.pid == -1) {
 		dprintf(
 			STDERR_FILENO,
-			"%s: fork: %s\n",
+			"%s: setsid: %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
+	u.ret = execve(
+		argv[1 + wopt],
+		(char* const*)argv + (1 + wopt),
+		(char* const*)envp
+		);
+	if (u.ret == -1) {
+		dprintf(
+			STDERR_FILENO,
+			"%s: execve: %s\n",
+			C_PROGNAME,
+			strerror(errno)
 			);
-		if (exec_ret == -1) {
+		exit(EXIT_FAILURE);
+	}
+}
+
+static void
+c_fork_parent
+(bool_t	wopt,
+ pid_t	pid)
+{
+	union ret_u u;
+	int status;
+
+	if (wopt == TRUE) {
+		u.pid = wait4(pid, &status, 0, NULL);
+		if (u.pid < 0) {
 			dprintf(
 				STDERR_FILENO,
-				"%s: execve: %s\n",
+				"%s: wait4: %s\n",
 				C_PROGNAME,
 				strerror(errno)
 				);
-			exit(EXIT_FAILURE);
 		}
+		exit(WEXITSTATUS(status));
+	}
+	exit(EXIT_SUCCESS);
+}
+
+static void
+c_fork_error(void)
+{
+	dprintf(
+		STDERR_FILENO,
+		"%s: fork: %s\n",
+		C_PROGNAME,
+		strerror(errno)
+		);
+	exit(EXIT_FAILURE);
+}
+
+void
+c_fork
+(const char*	argv[],
+ const char*	envp[],
+ bool_t			wopt)
+{
+	pid_t pid;
+
+	pid = fork();
+	if (pid == -1) {
+		c_fork_error();
+	}
+	else if (pid == 0) {
+		c_fork_child(argv, envp, wopt);
 	}
 	else {
-		exit(EXIT_SUCCESS);
+		c_fork_parent(wopt, pid);
 	}
 }
diff --git a/src/c_fork.h b/src/c_fork.h
index dfc154c..18e059b 100644
--- a/src/c_fork.h
+++ b/src/c_fork.h
@@ -39,15 +39,22 @@
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  * bsdsetsid: src/c_fork.h
- * Thu Nov 26 22:09:56 CET 2020
+ * Thu Nov 26 23:39:54 CET 2020
  * Joe
  */
 
 #ifndef __C_FORK_H__
 #define __C_FORK_H__
 
+#include <sys/types.h>
+
 #include "c_bsdsetsid.h"
 
+union ret_u {
+	pid_t	pid;
+	int		ret;
+};
+
 void c_fork(const char*[], const char*[], bool_t);
 
 #endif
-- 
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