*** UNIX MANUAL PAGE BROWSER ***

filehdr(4) Kernel Interfaces Manual filehdr(4) NAME filehdr - File header for object files SYNOPSIS #include < filehdr.h> DESCRIPTION Every object file begins with a header. The following C struct decla- ration is used: struct filehdr { unsigned short f_magic; /* magic number */ unsigned short f_nscns; /* number of sections */ int f_timdat; /* time & date stamp */ long f_symptr; /* file pointer to symbolic header */ int f_nsyms; /* sizeof(symbolic header) */ unsigned short f_opthdr; /* sizeof(optional header) */ unsigned short f_flags; /* flags */ }; f_symptr is the byte offset into the file at which the symbolic header can be found. Its value can be used as the offset in fseek(3) to posi- tion an I/O stream to the symbolic header. f_nsyms contains the size of the symbolic header. The valid magic numbers are given below: #define ALPHAMAGIC 0603 /* object file */ #define ALPHAMAGICZ 0610 /* compressed object file */ #define ALPHAUMAGIC 0617 /* ucode object file */ The value in f_timdat is obtained from the times(3) system call. Flag bits used in objects are: #define F_RELFLG 0000001 /* relocation entries stripped */ #define F_EXEC 0000002 /* file is executable */ #define F_LNNO 0000004 /* line numbers stripped */ #define F_LSYMS 0000010 /* local symbols stripped */ RELATED INFORMATION times(3), fseek(3), a.out(4). delim off filehdr(4)