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For a 32-bit class file, elf32_getphdr() returns a pointer to the program execution header table, if one is available for the ELF descriptor elf.
elf32_newphdr() allocates a new table with count entries, regardless of whether one existed previously, and sets the ELF_F_DIRTY bit for the table. See elf_flagdata(3ELF). Specifying a zero count deletes an existing table. Note this behavior differs from that of elf32_newehdr() allowing a program to replace or delete the program header table, changing
its size if necessary. See elf32_getehdr(3ELF).
If no program header table exists, the file is not a 32-bit class file, an error occurs, or elf is NULL, both functions return a null pointer. Additionally, elf32_newphdr() returns a null pointer if count
is 0.
The table is an array of Elf32_Phdr structures, each of which includes the following members:
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Elf32_Word p_type;
Elf32_Off p_offset;
Elf32_Addr p_vaddr;
Elf32_Addr p_paddr;
Elf32_Word p_filesz;
Elf32_Word p_memsz;
Elf32_Word p_flags;
Elf32_Word p_align;
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The Elf64_Phdr structures include the following members:
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Elf64_Word p_type;
Elf64_Word p_flags;
Elf64_Off p_offset;
Elf64_Addr p_vaddr;
Elf64_Addr p_paddr;
Elf64_Xword p_filesz;
Elf64_Xword p_memsz;
Elf64_Xword p_align;
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For the 64-bit class, replace 32 with 64 as appropriate.
The ELF header's e_phnum member tells how many entries the program header table has. See elf32_getehdr(3ELF). A program may
inspect this value to determine the size of an existing table; elf32_newphdr() automatically sets the member's value to count. If the program is building a new file, it is responsible for creating the file's ELF header before
creating the program header table.
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