Index for Section 4

Alphabetical listing for F

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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).

Index for Section 4

Alphabetical listing for F

Top of page