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2008-03-23 Leslie Polzer <leslie.polzer@gmx.net> Merge Leslie Polzer's ARG_MAX enhancements to xargs which were produced as part of the Google Summer of Code 2007. These changes fix Savannah bug #22708. * find/pred.c (launch): The struct buildcmd_control* argument is no longer const. * find/defs.h: Likewise * lib/buildcmd.c (bc_do_insert): The struct buildcmd_control* argument is no longer const. (bc_push_arg): Likewise. (cb_exec_noop): Likewise. (get_stringv_len): New function; measures the length of a NULL-terminated argv sequence. (bc_do_exec): Rename from do_exec, and make global. Modify the function to react to exec failing with E2BIG by trying again with fewer arguments. * xargs/xargs.1: Mention that xargs automatically adopts to the situation where exec fails with E2BIG. * xargs/xargs.c: (parent): New variable, the PID of the parent process. (main): initialise the variable 'parent'. Don't fail immediately due to lack of space when the environment is large. Call xargs_do_exec via bc_do_exec. (xargs_do_exec): The struct buildcmd_control* argument is no longer const. When exec fails in the child, communicate the errno value back to the parent through a pipe which is close-on-exec; this allows us to accurately determine the cause of the failure and also to distinguish exec failures from all possible exit codes in the child. (wait_for_proc): If the utility cannot be found or cannot be run, we now find out about this by reading an errno value from the pipe, so this means that exit codes 126 and 127 in the child no longer have a special interpretation. * NEWS: mention these changes.