cvs commit: src/lib/libc/stdlib getenv.c src/tools/regression/environ envctl.c envtest.t timings.c

Sean Farley scf at
Fri Jul 20 23:30:14 UTC 2007

scf         2007-07-20 23:30:13 UTC

  FreeBSD src repository

  Modified files:
    lib/libc/stdlib      getenv.c 
    tools/regression/environ envctl.c envtest.t timings.c 
  Added environ-replacement detection.  For programs that "clean" (i.e., su)
  or replace (i.e., zdump) the environment after a call to setenv(), putenv()
  or unsetenv() has been made, a few changes were made.
    - getenv() will return the value from the new environ array.
    - setenv() was split into two functions:  __setenv() which is most of the
      previous setenv() without checks on the name and setenv() which
      contains the checks before calling __setenv().
    - setenv(), putenv() and unsetenv() will unset all previous values and
      call __setenv() on all entries in the new environ array which in turn
      adds them to the end of the envVars array.  Calling __setenv() instead
      of setenv() is done to avoid the temporary replacement of the '=' in a
      string with a NUL byte.  Some strings may be read-only data.
  Added more regression checks for clearing the environment array.
  Replaced gettimeofday() with getrusage() in timing regression check for
  better accuracy.
  Fixed an off-by-one bug in __remove_putenv() in the use of memmove().  This
  went unnoticed due to the allocation of double the number of environ
  entries when building envVars.
  Fixed a few spelling mistakes in the comments.
  Reviewed by:    ache
  Approved by:    wes
  Approved by:    re (kensmith)
  Revision  Changes    Path
  1.10      +163 -78   src/lib/libc/stdlib/getenv.c
  1.2       +18 -8     src/tools/regression/environ/envctl.c
  1.2       +21 -0     src/tools/regression/environ/envtest.t
  1.2       +31 -26    src/tools/regression/environ/timings.c

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