c - Reading the program header contents of an ELF file -

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how possible extract loadable program headers individually elf files? examining binary using readelf 1 can output similar to:

$ readelf -l helloworld  elf file type exec (executable file) entry point 0x400440 there 9 program headers, starting @ offset 64  program headers:   type           offset             virtaddr           physaddr                  filesiz            memsiz              flags  align   phdr           0x0000000000000040 0x0000000000400040 0x0000000000400040                  0x00000000000001f8 0x00000000000001f8  r e    8   interp         0x0000000000000238 0x0000000000400238 0x0000000000400238                  0x000000000000001c 0x000000000000001c  r      1       [requesting program interpreter: /lib64/ld-linux-x86-64.so.2]   load           0x0000000000000000 0x0000000000400000 0x0000000000400000                  0x000000000000070c 0x000000000000070c  r e    200000   load           0x0000000000000e10 0x0000000000600e10 0x0000000000600e10                  0x0000000000000230 0x0000000000000238  rw     200000   dynamic        0x0000000000000e28 0x0000000000600e28 0x0000000000600e28                  0x00000000000001d0 0x00000000000001d0  rw     8   note           0x0000000000000254 0x0000000000400254 0x0000000000400254                  0x0000000000000044 0x0000000000000044  r      4   gnu_eh_frame   0x00000000000005e4 0x00000000004005e4 0x00000000004005e4                  0x0000000000000034 0x0000000000000034  r      4   gnu_stack      0x0000000000000000 0x0000000000000000 0x0000000000000000                  0x0000000000000000 0x0000000000000000  rw     10   gnu_relro      0x0000000000000e10 0x0000000000600e10 0x0000000000600e10                  0x00000000000001f0 0x00000000000001f0  r      1   section segment mapping:   segment sections...    00         01     .interp     02     .interp .note.abi-tag .note.gnu.build-id .gnu.hash .dynsym .dynstr .gnu.version .gnu.version_r .rela.dyn .rela.plt .init .plt .text .fini .rodata .eh_frame_hdr .eh_frame     03     .init_array .fini_array .jcr .dynamic .got .got.plt .data .bss     04     .dynamic     05     .note.abi-tag .note.gnu.build-id     06     .eh_frame_hdr     07         08     .init_array .fini_array .jcr .dynamic .got

this question answers how loadable headers being mapped memory(and where) not specify where(from offset , size) sections read within given binary.
determined current program header's fields p_offset , p_filesz?

struct proghdr {         uint32_t p_type;         uint32_t p_offset;         uint32_t p_va;         uint32_t p_pa;         uint32_t p_filesz;         uint32_t p_memsz;         uint32_t p_flags;          uint32_t p_align; };   struct elf *elf_header = ... struct proghdr *ph; if (elf_header->e_magic != elf_magic)     goto bad; ph = (struct proghdr *) ((uint8_t *) elf_header + elf_header->e_phoff); eph = ph + elfhdr->e_phnum; (; ph < eph; ph++)     if(ph->p_type == pt_load)         /*read_pload (dst address in memory, how many bytes read, offset in file) */         read_pload(ph->p_pa, ph->p_memsz, ph->p_offset);

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