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HP-UX Reference Volume 4 of 5 > e
elf_getphdr(3E) |
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NAMEelf32_getphdr, elf32_newphdr, elf64_getphdr, elf64_newphdr — retrieve class-dependent program header table for elf32 and elf64 files, respectively SYNOPSIScc [flag... ] file... -lelf [library] ... #include <libelf.h> Elf32_Ehdr *elf32_getphdr(Elf *elf); Elf32_Ehdr *elf32_newphdr(Elf *elf, size_t count); Elf64_Ehdr *elf64_getphdr(Elf *elf); Elf64_Ehdr *elf64_newphdr(Elf *elf, size_t count); DESCRIPTIONFor 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_flag(3E)). Specifying a zero count deletes an existing table. Note this behavior differs from that of elf32_newehdr (see elf_getehdr(3E)), allowing a program to replace or delete the program header table, changing its size if necessary. 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 zero. The table is an array of Elf32_Phdr structures, each of which includes the following members. 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; The ELF header's e_phnum member tells how many entries the program header table has (see elf_getehdr(3E)). 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. For a 64-bit class file, elf64_getphdr returns a pointer to the program execution header table, if one is available for the ELF descriptor elf. elf64_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_flag(3E)). Specifying a zero count deletes an existing table. Note this behavior differs from that of elf64_newehdr (see elf_getehdr(3E)), allowing a program to replace or delete the program header table, changing its size if necessary. If no program header table exists, the file is not a 64-bit class file, an error occurs, or elf is null, both functions return a null pointer. Additionally, elf64_newphdr returns a null pointer if count is zero. The table is an array of Elf64_Phdr structures, each of which includes the following members. Elf64_Word p_type; Elf64_Off p_offset; Elf64_Addr p_vaddr; Elf64_Addr p_paddr; Elf64_Word p_filesz; Elf64_Word p_memsz; Elf64_Word p_flags; Elf64_Word p_align; The ELF header's e_phnum member tells how many entries the program header table has (see elf_getehdr(3E)). A program may inspect this value to determine the size of an existing table; elf64_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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