Errors I do not understand

FossilOrigin-Name: 7908f3891d84f726b01bd9641094654c295550ff

5 files changed, 144 insertions, 41 deletions

diff --git a/Makefile b/Makefile
index fa1f5d7..b74f92f 100644
--- a/Makefile
+++ b/Makefile
@@ -23,12 +23,13 @@ PREFIX		:= /usr/local/
 DESTDIR		:=
 
 SRCS		:= ${SRCS_DIR}c_bsdsetsid.S
+SRCS		+= ${SRCS_DIR}e_err.S
 SRCS		+= ${SRCS_DIR}u_print.S
 SRCS		+= ${SRCS_DIR}u_strlen.S
 
 OBJS		 = ${SRCS:.S=.o}
 
-AS			 = as
+# AS			 = yasm
 # ASFLAGS		 = -felf64
 # ASFLAGS		+= -pgas
 
diff --git a/src/c_bsdsetsid.S b/src/c_bsdsetsid.S
index 4c9189c..b0027f9 100644
--- a/src/c_bsdsetsid.S
+++ b/src/c_bsdsetsid.S
@@ -39,32 +39,47 @@
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  * bsdsetsid: src/c_bsdsetsid.S
- * 2020-11-18 12:37
+ * 2020-11-20 18:18
  * Joe
  *
  * This is the entrypoint of the program.
  */
 
 .text
-.extern	u_strlen
-.extern	u_pout
-.extern	u_perr
 .globl	main
 
 main:
 	cmpb	$0x1, %dil
-	jle		c_noarg
+	jle		e_noarg
 	xor		%rax, %rax
-	movb	$0x2, %al	/* SYS_fork */
+	movb	$0x2, %al
 	syscall
-	jc		c_fork_fail
+	jc		e_fork
 	cmp		$0x0, %rax
 	je		c_child
 
-c_child:
+c_parent:
+	mov		%rax, %rdi
+#	xor		%r8, %r8
+#	lea		(%r8), %rsi
+	mov		$0x0, %rdx
+	mov		$0x0, %rcx
 	xor		%rax, %rax
-	movb	$0x93, %al	/* SYS_setsid */
+	movb	$0x7, %al	/* SYS_wait4 */
 	syscall
+
+	xor		%rdi, %rdi
+	movb	%al, %dil
+	movb	$0x7, %al
+	xor		%rax, %rax
+	movb	$0x1, %al	/* SYS_exit */
+	syscall
+
+c_child:
+#	xor		%rax, %rax
+#	movb	$0x93, %al	/* SYS_setsid */
+#	syscall
+#	jc		e_setsid
 	xor		%rax, %rax
 	push	%rsi
 	mov		$0x1, %rcx
@@ -72,31 +87,12 @@ c_child:
 	lea		0(%rsi, %rcx, 8), %rsi
 	movb	$0x3b, %al	/* SYS_execve */
 	syscall
+	jc		e_execve
 	pop		%rsi
 	jmp		c_exit
 
-c_fork_fail:
-	lea		forkfail_str, %rdi
-	call	u_perr
-	mov		$0x2, %rdi
-	xor		%rax, %rax
-	movb	$0x1, %al	/* SYS_exit */
-	syscall
-
-c_noarg:
-	lea		noarg_str, %rdi
-	call	u_perr
-	mov		$0x1, %rdi
-	xor		%rax, %rax
-	movb	$0x1, %al	/* SYS_exit */
-	syscall
-
 c_exit:
 	xor		%rdi, %rdi
 	xor		%rax, %rax
 	movb	$0x1, %al	/* SYS_exit */
 	syscall
-
-.data
-noarg_str:		.asciz "bsdsetsid: no command specified"
-forkfail_str:	.asciz "bsdsetsid: fork failed"
diff --git a/src/e_err.S b/src/e_err.S
new file mode 100644
index 0000000..bf5fa1d
--- /dev/null
+++ b/src/e_err.S
@@ -0,0 +1,113 @@
+/*
+ * ========================
+ * =====    ===============
+ * ======  ================
+ * ======  ================
+ * ======  ====   ====   ==
+ * ======  ===     ==  =  =
+ * ======  ===  =  ==     =
+ * =  ===  ===  =  ==  ====
+ * =  ===  ===  =  ==  =  =
+ * ==     =====   ====   ==
+ * ========================
+ *
+ * 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/e_err.S
+ * 2020-11-20 16:43
+ * Joe
+ *
+ * General error handling happen here.
+ */
+
+.text
+.extern	strerror
+.globl	e_execve
+.globl	e_fork
+.globl	e_noarg
+.globl	e_setsid
+
+e_noarg:
+	lea		e_noarg_str, %rdi
+	call	u_perr
+	mov		$0x1, %rdi
+	jmp		e_exit
+
+e_fork:
+	push	%rax
+	lea		e_fork_str, %rdi
+	call	u_perr
+	pop		%rax
+	mov		%rax, %rdi
+	call	strerror
+	mov		%rax, %rdi
+	call	u_perr
+	mov		$0x2, %rdi
+	jmp		e_exit
+
+e_setsid:
+	push	%rax
+	lea		e_setsid_str, %rdi
+	call	u_perr
+	pop		%rax
+	mov		%rax, %rdi
+	call	strerror
+	mov		%rax, %rdi
+	call	u_perr
+	lea		nl, %rdi
+	call	u_perr
+	mov		$0x3, %rdi
+	jmp		e_exit
+
+e_execve:
+	push	%rax
+	lea		e_execve_str, %rdi
+	call	u_perr
+	pop		%rax
+	mov		%rax, %rdi
+	call	strerror
+	mov		%rax, %rdi
+	call	u_perr
+	lea		nl, %rdi
+	call	u_perr
+	mov		$0x4, %rdi
+	xor		%rax, %rax
+	movb	$0x1, %al	/* SYS_exit */
+	syscall
+
+e_exit:
+	xor		%rax, %rax
+	movb	$0x1, %al	/* sys_exit */
+	syscall
+
+.data
+nl:				.asciz "\n"
+e_setsid_str:	.asciz "bsdsetsid: setsid: "
+e_execve_str:	.asciz "bsdsetsid: execve: "
+e_fork_str:		.asciz "bsdsetsid: fork: "
+e_noarg_str:	.asciz "bsdsetsid: no command specified\n"
diff --git a/src/u_print.S b/src/u_print.S
index 969cf28..36fca6d 100644
--- a/src/u_print.S
+++ b/src/u_print.S
@@ -38,7 +38,7 @@
  * (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_bsdsetsid.S
+ * bsdsetsid: src/u_print.S
  * 2020-11-19 13:27
  * Joe
  *
@@ -46,7 +46,6 @@
  */
 
 .text
-.extern	u_strlen
 .globl	u_pout
 .globl	u_perr
 
@@ -55,7 +54,7 @@ u_pout:
 	jmp		u_print
 
 u_perr:
-	mov	$0x2, %r11	/* stderr */
+	mov		$0x2, %r11	/* stderr */
 	jmp		u_print
 
 u_print:
@@ -65,11 +64,4 @@ u_print:
 	mov		%r11, %rdi
 	mov		$0x4, %rax	/* SYS_write */
 	syscall
-	lea		nl, %rsi
-	mov		$0x1, %rdx
-	mov		$0x4, %rax	/* SYS_write */
-	syscall
 	ret
-
-.data
-nl: .asciz "\n"
diff --git a/src/u_strlen.S b/src/u_strlen.S
index 2cfbb1b..fb783ab 100644
--- a/src/u_strlen.S
+++ b/src/u_strlen.S
@@ -38,12 +38,13 @@
  * (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_bsdsetsid.S
+ * bsdsetsid: src/u_strlen.S
  * 2020-11-19 14:10
  * Joe
  *
  * Simple implementation of strlen.
  */
+
 .text
 .globl	u_strlen