user: Please show me the C implementation that matches the assembly code listed below:

```asm
<main>:
  endbr64
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x30,%rsp
  mov    %fs:0x28,%rax
  mov    %rax,0x28(%rsp)
  xor    %eax,%eax
  movl   $0x11,(%rsp)
  movl   $0x12,0x4(%rsp)
  movl   $0x1b,0x8(%rsp)
  movl   $0x16,0xc(%rsp)
  movl   $0x0,0x10(%rsp)
  movl   $0x0,0x14(%rsp)
  movl   $0x0,0x18(%rsp)
  movl   $0x0,0x1c(%rsp)
  mov    $0x11,%esi
  lea    D67(%rip),%rdi
  call   <printf@plt>
  mov    %rsp,%rbx
  lea    0x10(%rsp),%rbp
  mov    %rbx,%r12
  lea    D31(%rip),%r13
L38:
  mov    (%r12),%esi
  mov    %r13,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  add    $0x4,%r12
  cmp    %rbp,%r12
  jne    L38
  mov    $0xa,%edi
  call   <putchar@plt>
  mov    0x10(%rsp),%esi
  lea    D42(%rip),%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  mov    %rbx,%r12
  lea    D31(%rip),%r13
L57:
  mov    (%r12),%edi
  call   <gpio_export@plt>
  mov    %eax,%esi
  mov    %r13,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  add    $0x4,%r12
  cmp    %rbp,%r12
  jne    L57
  mov    $0xa,%edi
  call   <putchar@plt>
  lea    D73(%rip),%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  mov    %rbx,%r12
  lea    D65(%rip),%r14
  lea    D31(%rip),%r13
L31:
  mov    %r14,%rsi
  mov    (%r12),%edi
  call   <gpio_set_edge@plt>
  mov    %eax,%esi
  mov    %r13,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  add    $0x4,%r12
  cmp    %rbp,%r12
  jne    L31
  mov    $0xa,%edi
  call   <putchar@plt>
  lea    D2(%rip),%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  lea    D31(%rip),%r12
L3:
  mov    $0x0,%esi
  mov    (%rbx),%edi
  call   <gpio_set_active_low@plt>
  mov    %eax,%esi
  mov    %r12,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  add    $0x4,%rbx
  cmp    %rbp,%rbx
  jne    L3
  mov    $0xa,%edi
  call   <putchar@plt>
  lea    D87(%rip),%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  mov    $0x0,%ebx
  lea    D31(%rip),%rbp
L53:
  mov    (%rsp,%rbx,1),%edi
  call   <gpio_fd_open@plt>
  mov    %eax,%esi
  mov    %eax,0x10(%rsp,%rbx,1)
  mov    %rbp,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  add    $0x4,%rbx
  cmp    $0x10,%rbx
  jne    L53
  mov    $0xa,%edi
  call   <putchar@plt>
  lea    D109(%rip),%rdi
  call   <puts@plt>
  lea    0x10(%rsp),%rbx
L59:
  mov    %rbx,%rdi
  call   <wait_event@plt>
  mov    $0xc350,%edi
  call   <usleep@plt>
  jmp    L59
```

tool_calls: name: disassemble_data
arguments: label: D67
type: string
name: disassemble_data
arguments: label: D31
type: string
name: disassemble_data
arguments: label: D42
type: string
name: disassemble_data
arguments: label: D73
type: string
name: disassemble_data
arguments: label: D65
type: string
name: disassemble_data
arguments: label: D2
type: string
name: disassemble_data
arguments: label: D87
type: string
name: disassemble_data
arguments: label: D109
type: string

tool: D67: pins    

tool: D31:  %2d

tool: D42: export  

tool: D73: edge    

tool: D65: rising

tool: D2: low     

tool: D87: fds     

tool: D109: waiting 300 sec for event

assistant: ```c
int main() {
  int i, rc;
  int pins[4] = {17, 18, 27, 22};
  int fds[4] = {0, 0, 0, 0};
  printf("pins    ", pins[i]);
  for (i = 0; i < 4; i++) {
    printf(" %2d", pins[i]);
  }
  printf("\n");
  printf("export  ", pins[i]);
  for (i = 0; i < 4; i++) {
    rc = gpio_export(pins[i]);
    printf(" %2d", rc);
  }
  printf("\n");
  printf("edge    ");
  for (i = 0; i < 4; i++) {
    rc = gpio_set_edge(pins[i], "rising");
    printf(" %2d", rc);
  }
  printf("\n");
  printf("low     ");
  for (i = 0; i < 4; i++) {
    rc = gpio_set_active_low(pins[i], 0);
    printf(" %2d", rc);
  }
  printf("\n");
  printf("fds     ");
  for (i = 0; i < 4; i++) {
    fds[i] = gpio_fd_open(pins[i]);
    printf(" %2d", fds[i]);
  }
  printf("\n");
  printf("waiting 300 sec for event\n");
  while (1) {
    wait_event(fds);
    usleep(50000);
  }
}
```