c - getting dynamic symbol table information from elf -

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i'm trying dynamic & static symbol table information elf.

that's code wrote:

void symbols(){     int  i;     elf32_ehdr *header; /* point header structure */     header = (elf32_ehdr *) map_start;      elf32_shdr *shdr = (elf32_shdr *)(map_start + header->e_shoff);      int shnum = header->e_shnum;     const char * str_p =null;     elf32_shdr *sh_strtab = &shdr[header->e_shstrndx];      const char *const sh_strtab_p = map_start + sh_strtab->sh_offset;     int j;      int k;      (i = 0; < shnum; ++i) {        if ((shdr[i].sh_type == sht_symtab)||(shdr[i].sh_type==sht_dynsym)){           str_p =(char *) shdr[shdr[i].sh_link].sh_offset;           elf32_sym *symboler =(elf32_sym *)(map_start + shdr[i].sh_offset);           for(j=0;j<(shdr[i].sh_size/shdr[i].sh_entsize);j++){               printf("%u ", symboler->st_size);                printf("%x ", symboler->st_value);                printf("%u ", symboler->st_shndx);               printf("%s\n",(char *) ((int)map_start+ (int)str_p + symboler->st_name));               symboler++;           }        }     } }

the problem dynamic symbol table, example:

 0 0 0   0 0 0 __gmon_start__  0 0 0 __libc_start_main  0 0 0 fopen  0 0 0 fgetc  0 0 0 printf  0 0 0 atoi  4 80485dc 15 _io_stdin_used

when i'm using readelf i'm getting name:

 0: 00000000     0 notype  local  default  und   1: 00000000     0 notype  weak   default  und __gmon_start__  2: 00000000     0 func    global default  und __libc_start_main@glibc_2.0 (2)  3: 00000000     0 func    global default  und fopen@glibc_2.1 (3)  4: 00000000     0 func    global default  und fgetc@glibc_2.0 (2)  5: 00000000     0 func    global default  und printf@glibc_2.0 (2)  6: 00000000     0 func    global default  und atoi@glibc_2.0 (2)  7: 080485dc     4 object  global default   15 _io_stdin_used

why atoi in version , atoi@glibc_2.0 (2) in readelf? how fix this?

readelf displays information symbol version besides name.

symbol versioning explained here.

symbol versioning - simple explanation

symbol versioning allows library define exported symbols through use of map file. allows 1 library provide multiple versions of same symbol. in past, without symbol versioning, accomplished bumping shared library version (libfoo.so.1, libfoo.so.2, etc.). 1 library version can provide multiple versions of same symbol.

for more details, see this page.


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