The docs here says this corresponds to process.h. On Linux, there doesn't seem to be a /usr/include/process.h. Even so, there should be an explicit list of the symbols that are exported into the D namespace.
Comment #1 by jlquinn — 2008-12-06T13:12:23Z
Made summary more specific, though same comment is true of most of std.c.
Comment #2 by andy — 2015-01-24T16:58:40Z
recommend closing, std.c.process is deprecated. no need to document it anymore.