IABSD.fr/src/lib/libelf/elf_next.3

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• Author : jsg
  Date : 2019-03-19 02:31:35
  Hash : e219834f
  Message : update libelf from elftoolchain r3669 to r3714 includes changes to address problems sunil@ found with fuzzing original diff from and ok sunil@

• lib/libelf/elf_next.3

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  .\" $Id: elf_next.3,v 1.2 2019/03/19 02:31:35 jsg Exp $
  .\"
  .Dd February 27, 2019
  .Dt ELF_NEXT 3
  .Os
  .Sh NAME
  .Nm elf_next
  .Nd provide sequential access to the next archive member
  .Sh LIBRARY
  .Lb libelf
  .Sh SYNOPSIS
  .In libelf.h
  .Ft Elf_Cmd
  .Fn elf_next "Elf *elf"
  .Sh DESCRIPTION
  The
  .Fn elf_next
  function causes the ELF archive descriptor corresponding to argument
  .Ar elf
  to be adjusted to provide access to the next member in
  the archive on a subsequent call to
  .Fn elf_begin .
  .Pp
  The return value of
  .Fn elf_next
  is suitable for use in a loop invoking
  .Fn elf_begin .
  .Sh RETURN VALUES
  If successful, function
  .Fn elf_next
  returns the value
  .Dv ELF_C_READ .
  Otherwise, if argument
  .Ar elf
  was not associated with an archive, or if it was
  .Dv NULL ,
  or if any other error occurred, the value
  .Dv ELF_C_NULL
  is returned.
  .Sh EXAMPLES
  To process all the members of an archive use:
  .Bd -literal -offset indent
  Elf_Cmd cmd;
  Elf *archive, *e;
  \&...
  cmd = ELF_C_READ;
  archive = elf_begin(fd, cmd, NULL);
  while ((e = elf_begin(fd, cmd, archive)) != (Elf *) 0)
  {
  	... process `e' here ...
  
  	cmd = elf_next(e);
  	elf_end(e);
  }
  elf_end(archive);
  .Ed
  .Sh ERRORS
  Function
  .Fn elf_next
  may fail with the following error:
  .Bl -tag -width "[ELF_E_RESOURCE]"
  .It Bq Er ELF_E_ARGUMENT
  Argument
  .Ar elf
  was not associated with a containing
  .Xr ar 1
  archive.
  .It Bq Er ELF_E_ARGUMENT
  An error was encountered while parsing the archive containing argument
  .Ar elf .
  .El
  .Sh SEE ALSO
  .Xr elf 3 ,
  .Xr elf_begin 3 ,
  .Xr elf_end 3 ,
  .Xr elf_rand 3