filehdr(4)                                                       filehdr(4)

NAME
     filehdr - file header for common object files

SYNOPSIS
     #include <filehdr.h>

DESCRIPTION
     Every common object file begins with a 20-byte header. The following C
     struct declaration is used:

          struct filehdr
          {
              unsigned short fmagic ;       /* magic number */
              unsigned short fnscns ;       /* number of sections */
              long           ftimdat ;      /* time & date stamp */
              long           fsymptr ;      /* file ptr to symtab */
              long           fnsyms ;       /* number of symtab entries */
              unsigned short fopthdr ;      /* sizeof(opt and header) */
              unsigned short fflags ;       /* flags */
          };

     fsymptr is the byte offset into the file at which the symbol table
     can be found. Its value can be used as the offset in fseek(3S) to
     position an I/O stream to the symbol table. The Reliant UNIX system
     optional header is 28 bytes. The valid magic numbers are given below:

          #define I386MAGIC    0514    /* i386 Computer */
          #define WE32MAGIC    0560    /* 3B2, 3B5, and 3B15 computers */
          #define N3BMAGIC     0550    /* 3B20 computer */
          #define NTVMAGIC     0551    /* 3B20 computer */
          #define VAXWRMAGIC   0570    /* VAX writable text segments */
          #define VAXROMAGIC   0575    /* VAX read only sharable text segments */
          #define MIPSEBMAGIC  0x0160
          #define MIPSELMAGIC  0x0162
          #define SMIPSEBMAGIC 0x6001
          #define SMIPSELMAGIC 0x6201
          #define MIPSEBUMAGIC 0x0180
          #define MIPSELUMAGIC 0x0182

     The value in ftimdat is obtained from the time(2) system call. Flag
     bits for f-flags currently defined are:

          #define FRELFLG  0000001  /* relocation entries stripped */
          #define FEXEC    0000002  /* file is executable */
          #define FLNNO    0000004  /* line numbers stripped */
          #define FLSYMS   0000010  /* local symbols stripped */
          #define FMINIMAL 0000020
          #define FUPDATE  0000040
          #define FSWABD   0000100
          #define FPATCH   0002000
          #define FNODF    0002000
          #define FCPIC    0004000



Page 1                       Reliant UNIX 5.44                Printed 11/98

filehdr(4)                                                       filehdr(4)

          #define FPIX     0010000

SEE ALSO
     time(2), fseek(3S), a.out(4).


















































Page 2                       Reliant UNIX 5.44                Printed 11/98