1 files changed, 113 insertions, 0 deletions
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"