syscall tracing a dynamic-linked 'Hello World' program with 1 format argument
maizure.org

$strace ./printf1
1  - execve("./printf1", ["./printf1"], [/* 47 vars */]) = 0
2  - brk(NULL)                               = 0x1dde000
3  - mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f59bce82000
4  - access("/etc/ld.so.preload", R_OK)      = -1 ENOENT (No such file or directory)
5  - open("/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
6  - fstat(3, {st_mode=S_IFREG|0644, st_size=83694, ...}) = 0
7  - mmap(NULL, 83694, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f59bce6d000
8  - close(3)                                = 0
9  - open("/lib64/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
10 - read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\20\35\2\0\0\0\0\0"..., 832) = 832
11 - fstat(3, {st_mode=S_IFREG|0755, st_size=2127336, ...}) = 0
12 - mmap(NULL, 3940800, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f59bc89f000
13 - mprotect(0x7f59bca57000, 2097152, PROT_NONE) = 0
14 - mmap(0x7f59bcc57000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1b8000) = 0x7f59bcc57000
15 - mmap(0x7f59bcc5d000, 16832, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f59bcc5d000
16 - close(3)                                = 0
17 - mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f59bce6c000
18 - mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f59bce6a000
19 - arch_prctl(ARCH_SET_FS, 0x7f59bce6a740) = 0
20 - mprotect(0x7f59bcc57000, 16384, PROT_READ) = 0
21 - mprotect(0x600000, 4096, PROT_READ)     = 0
22 - mprotect(0x7f59bce83000, 4096, PROT_READ) = 0
23 - munmap(0x7f59bce6d000, 83694)           = 0
24 - fstat(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 0), ...}) = 0
25 - mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f59bce81000
26 - write(1, "Hello World 1\n", 14Hello World 1)         = 14
27 - exit_group(0) = ?
+++ exited with 0 +++

Line 1  - Program is forked from bash and calls execve() to load ./printf1 with the default argument of program name.
Line 2  - Program calls brk() to find the current end of the data segment, which is 0x1dde000. If this program wanted
          space on the heap, there would be subsequent calls to brk() using higher values. That's not the case this time.
Line 3  - Memory maps a page of read-write memory that is not backed by a file (all 0s) and not sharable. At 0x7f59bce82000
Line 4  - Checks permissions of user-specified shared libraries. There are none, so this access attempt fails.
Line 5  - Opens the file containing the list of directors to search for shared libraries. Returned as file descriptor 3.
Line 6  - Checks the status of the new file descriptor. File is 21 pages of memory size (83694 bytes, 4096 bytes per page).
Line 7  - Memory maps the directory list as private and read-only. It now lives between 0x7f59bce6d000 - 0x7f59bce81000.
Line 8  - Closes the shared-library directory list, file descriptor 3 is available again
Line 9  - Opens the symbolic link to the shared standard library (libc.so.6) as file descriptor 3.
Line 10 - Reads the first 832 bytes of the library, header + extras for 64-bit. Success, with 832 bytes read.
Line 11 - Gets the file data for the shared library. Size is 2127336 (520 pages of memory)
Line 12 - Memory map the standard library as read-able and executable, but not writable. It will live at 0x7f59bc89f000.
Line 13 - Removes all access to ~2MB of memory after libc code (likely guard pages)
Line 14 - Memory maps 6 more pages from libc (pages 440-445) as read-write. Scratch space?
Line 15 - Maps four more pages of generic read-write memory between 0x7f59bcc5d000 and 0x7f59bcc62000
Line 16 - Closes the shared standard library file. File descriptor 3 is now available again.
Line 17 - Memory maps a page of read-write memory, probably to suppose thread usage.
Line 18 - Memory maps another 2 pages of memory for read and write. This is probably used for thread local storage
Line 19 - Sets FS to the newly reserved thread local storage area
Line 20 - Sets 4 pages of the standard library to read only
Line 21 - Sets the read-only data application segment (subsequent page is .BSS)
Line 22 - Sets a page of the dynamic linker library to read-only
Line 23 - Unmaps the shared library directory memory space, since the library has been loaded
Line 24 - Get's the status of the stdout file descriptor (/dev/pts/0)
Line 25 - Memory maps a page used in printf's temporary buffer for format resolution
Line 26 - Printf's write syscall for Hello World 1
Line 27 - Exit with status 0