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 declaration 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
       position 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)