execve("./a.out", ["./a.out"], [/* 45 vars */]) = 0
brk(NULL)                               = 0x1779000
access("/etc/ld.so.nohwcap", F_OK)      = -1 ENOENT (No such file or directory)
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fee43200000
access("/etc/ld.so.preload", R_OK)      = -1 ENOENT (No such file or directory)
open("/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=101816, ...}) = 0
mmap(NULL, 101816, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7fee431e7000
close(3)                                = 0
access("/etc/ld.so.nohwcap", F_OK)      = -1 ENOENT (No such file or directory)
open("/lib/x86_64-linux-gnu/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0 \10\2\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=1697504, ...}) = 0
mmap(NULL, 3803552, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7fee42c3e000
mprotect(0x7fee42dd5000, 2097152, PROT_NONE) = 0
mmap(0x7fee42fd5000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x197000) = 0x7fee42fd5000
mmap(0x7fee42fdb000, 14752, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7fee42fdb000
close(3)                                = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fee431e6000
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fee431e5000
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fee431e4000
arch_prctl(ARCH_SET_FS, 0x7fee431e5700) = 0
mprotect(0x7fee42fd5000, 16384, PROT_READ) = 0
mprotect(0x7fee43202000, 4096, PROT_READ) = 0
munmap(0x7fee431e7000, 101816)          = 0
open("sample.txt", O_RDWR)              = 3
fstat(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 7), ...}) = 0
brk(NULL)                               = 0x1779000
brk(0x179a000)                          = 0x179a000
write(1, "File descriptor opened: 1\n", 26) = 26
open("sample.txt", O_RDWR)              = 4
write(1, "File descriptor opened: 1\n", 26) = 26
open("sample.txt", O_RDWR)              = 5
write(1, "File descriptor opened: 1\n", 26) = 26
open("sample.txt", O_RDWR)              = 6
write(1, "File descriptor opened: 1\n", 26) = 26
open("sample.txt", O_RDWR)              = 7
write(1, "File descriptor opened: 1\n", 26) = 26
open("sample.txt", O_RDWR)              = 8
write(1, "File descriptor opened: 1\n", 26) = 26
open("sample.txt", O_RDWR)              = 9
write(1, "File descriptor opened: 1\n", 26) = 26
open("sample.txt", O_RDWR)              = 10
write(1, "File descriptor opened: 1\n", 26) = 26
open("sample.txt", O_RDWR)              = 11
write(1, "File descriptor opened: 1\n", 26) = 26
open("sample.txt", O_RDWR)              = 12
write(1, "File descriptor opened: 1\n", 26) = 26
open("sample.txt", O_RDWR)              = 13
exit_group(0)                           = ?
+++ exited with 0 +++