#define NULL ((void *)0)
typedef unsigned long size_t; // Customize by platform.
typedef long intptr_t;
typedef unsigned long uintptr_t;
typedef long scalar_t__; // Either arithmetic or pointer type.
/* By default, we understand bool (as a convenience). */
typedef int bool;
#define false 0
#define true 1

/* Forward declarations */

/* Type definitions */
typedef int pid_t;

/* Variables and functions */
scalar_t__ atol(char *);
int /*<<< orphan*/ exit(int);
int /*<<< orphan*/ fprintf(int /*<<< orphan*/, char *, char *);
int getsid(int);
int /*<<< orphan*/ perror(char *);
int /*<<< orphan*/ printf(char *, int);
int /*<<< orphan*/ stderr;
int main(int argc, char *argv[]) {
  pid_t pid, session_id;
  if (argc != 2) {
    fprintf(stderr, "Usage: %s pid\n", argv[0]);
    exit(-1);
  }
  pid = (pid_t)atol(argv[1]);
  printf("pid = %d \n", pid);
  if ((session_id = getsid(pid)) < 0) {
    perror("getsid");
    exit(1);
  }
  printf("session ID = %d\n", session_id);
  exit(0);
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
movl   $0x0,-0x4(%rbp)
mov    %edi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
cmpl   $0x2,-0x8(%rbp)
je     11a6 <main+0x46>
mov    0x2e59(%rip),%rax
mov    (%rax),%edi
mov    -0x10(%rbp),%rax
mov    (%rax),%rdx
lea    0xe69(%rip),%rsi
call   1050 <fprintf@plt>
mov    $0xffffffff,%edi
call   1080 <exit@plt>
mov    -0x10(%rbp),%rax
mov    0x8(%rax),%rdi
call   1060 <atol@plt>
mov    %eax,-0x14(%rbp)
mov    -0x14(%rbp),%esi
lea    0xe4f(%rip),%rdi
call   1030 <printf@plt>
mov    -0x14(%rbp),%edi
call   1040 <getsid@plt>
mov    %eax,-0x18(%rbp)
cmp    $0x0,%eax
jge    11ef <main+0x8f>
lea    0xe3a(%rip),%rdi
call   1070 <perror@plt>
mov    $0x1,%edi
call   1080 <exit@plt>
mov    -0x18(%rbp),%esi
lea    0xe28(%rip),%rdi
call   1030 <printf@plt>
xor    %edi,%edi
call   1080 <exit@plt>

x86 assembly (clang, -O2):
<main>:
push   %rbx
cmp    $0x2,%edi
jne    11a1 <main+0x41>
mov    0x8(%rsi),%rdi
call   1060 <atol@plt>
mov    %rax,%rbx
lea    0xe96(%rip),%rdi
mov    %ebx,%esi
call   1030 <printf@plt>
mov    %ebx,%edi
call   1040 <getsid@plt>
test   %eax,%eax
jns    11c3 <main+0x63>
lea    0xe88(%rip),%rdi
call   1070 <perror@plt>
mov    $0x1,%edi
call   1080 <exit@plt>
mov    0x2e38(%rip),%rax
mov    (%rax),%edi
mov    (%rsi),%rdx
lea    0xe4c(%rip),%rsi
call   1050 <fprintf@plt>
mov    $0xffffffff,%edi
call   1080 <exit@plt>
lea    0xe57(%rip),%rdi
mov    %eax,%esi
call   1030 <printf@plt>
xor    %edi,%edi
call   1080 <exit@plt>

LLVM IR (-O0):
@stderr = global i32 0
@.str = [15 x i8] c"Usage: %s pid\0A\00"
@.str.1 = [11 x i8] c"pid = %d \0A\00"
@.str.2 = [7 x i8] c"getsid\00"
@.str.3 = [17 x i8] c"session ID = %d\0A\00"
define i32 @main(i32 %0, i8** %1) {
%3 = alloca i32
%4 = alloca i32
%5 = alloca i8**
%6 = alloca i32
%7 = alloca i32
store i32 0, i32* %3
store i32 %0, i32* %4
store i8** %1, i8*** %5
%8 = load i32, i32* %4
%9 = icmp ne i32 %8, 2
br i1 %9, label %10, label %17
10: ; preds = %2
%11 = load i32, i32* @stderr
%12 = load i8**, i8*** %5
%13 = getelementptr inbounds i8*, i8** %12, i64 0
%14 = load i8*, i8** %13
%15 = call i32 @fprintf(i32 %11, i8* getelementptr inbounds ([15 x i8], [15 x i8]* @.str, i64 0, i64 0), i8* %14)
%16 = call i32 @exit(i32 -1)
unreachable
17: ; preds = %2
%18 = load i8**, i8*** %5
%19 = getelementptr inbounds i8*, i8** %18, i64 1
%20 = load i8*, i8** %19
%21 = call i64 @atol(i8* %20)
%22 = trunc i64 %21 to i32
store i32 %22, i32* %6
%23 = load i32, i32* %6
%24 = call i32 @printf(i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str.1, i64 0, i64 0), i32 %23)
%25 = load i32, i32* %6
%26 = call i32 @getsid(i32 %25)
store i32 %26, i32* %7
%27 = icmp slt i32 %26, 0
br i1 %27, label %28, label %31
28: ; preds = %17
%29 = call i32 @perror(i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.2, i64 0, i64 0))
%30 = call i32 @exit(i32 1)
unreachable
31: ; preds = %17
%32 = load i32, i32* %7
%33 = call i32 @printf(i8* getelementptr inbounds ([17 x i8], [17 x i8]* @.str.3, i64 0, i64 0), i32 %32)
%34 = call i32 @exit(i32 0)
unreachable
}

LLVM IR (-O2):
@stderr = global i32 0
@.str = [15 x i8] c"Usage: %s pid\0A\00"
@.str.1 = [11 x i8] c"pid = %d \0A\00"
@.str.2 = [7 x i8] c"getsid\00"
@.str.3 = [17 x i8] c"session ID = %d\0A\00"
define i32 @main(i32 %0, i8** nocapture %1) {
%3 = icmp eq i32 %0, 2
br i1 %3, label %9, label %4
4: ; preds = %2
%5 = load i32, i32* @stderr
%6 = load i8*, i8** %1
%7 = tail call i32 @fprintf(i32 %5, i8* getelementptr inbounds ([15 x i8], [15 x i8]* @.str, i64 0, i64 0), i8* %6)
%8 = tail call i32 @exit(i32 -1)
unreachable
9: ; preds = %2
%10 = getelementptr inbounds i8*, i8** %1, i64 1
%11 = load i8*, i8** %10
%12 = tail call i64 @atol(i8* %11)
%13 = trunc i64 %12 to i32
%14 = tail call i32 @printf(i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str.1, i64 0, i64 0), i32 %13)
%15 = tail call i32 @getsid(i32 %13)
%16 = icmp slt i32 %15, 0
br i1 %16, label %17, label %20
17: ; preds = %9
%18 = tail call i32 @perror(i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.2, i64 0, i64 0))
%19 = tail call i32 @exit(i32 1)
unreachable
20: ; preds = %9
%21 = tail call i32 @printf(i8* getelementptr inbounds ([17 x i8], [17 x i8]* @.str.3, i64 0, i64 0), i32 %15)
%22 = tail call i32 @exit(i32 0)
unreachable
}