Add getconf.

2 files changed, 180 insertions, 0 deletions

diff --git a/scripts/make.sh b/scripts/make.sh
index 993bcd33..1119ed9d 100755
--- a/scripts/make.sh
+++ b/scripts/make.sh
@@ -262,6 +262,42 @@ then
   generated/config2help Config.in $KCONFIG_CONFIG > generated/help.h || exit 1
 fi
 
+mksysconf()
+{
+  echo "int ${1}_vals[] = {" &&
+
+  # Extract names, remove blank lines, filter, replace unknown #defines
+  # with UNKNOWN
+  sed -n "/char [*]${1}_names[[]/"',/^}/s/[^"]*"\([^"]*\) *",*/\1\n/pg' \
+    toys/posix/getconf.c | grep -v '^$' | $2 |
+    sed -e "$DEFINES" -e "t;d;a UNKNOWN" | xargs | tr ' ' ',' &&
+  echo '};'
+}
+
+if ! [ generated/getconf.h -nt toys/posix/getconf.c ]
+then
+  echo generated/getconf.h
+
+  # Dump #define list for limits.h and unistd.h, create sed expression to
+  # match known defines
+  DEFINES="$(echo -e '#include <limits.h>\n#include <unistd.h>' | \
+    gcc -E -dM - | \
+    sed -n 's@^#define[ \t][ \t]*\([^ \t(]*\)[ \t].*@s/^\1$/\&/@p' )"
+
+  # Extract limit names, compare against limits.h #defines, replace unknown
+  # ones with UNKNOWN
+
+  {
+    mksysconf sysconf \
+      sed\ 's/^_POSIX2/2/;s/^PTHREAD/THREAD/;s/^_POSIX_//;s/^_XOPEN_/XOPEN_/;s/^/_SC_/' &&
+    mksysconf confstr sed\ 's/.*/_CS_&/' &&
+    mksysconf limit cat
+  } > generated/getconf.h
+
+  unset HEADERS
+fi
+
+
 [ ! -z "$NOBUILD" ] && exit 0
 
 echo -n "Compile toybox"
diff --git a/toys/posix/getconf.c b/toys/posix/getconf.c
new file mode 100644
index 00000000..adc96e64
--- /dev/null
+++ b/toys/posix/getconf.c
@@ -0,0 +1,144 @@
+/* getconf.c - get configuration values
+ *
+ * Copyright 2017 Rob Landley <rob@landley.net>
+ *
+ * See http://pubs.opengroup.org/onlinepubs/9699919799/utilities/getconf.c
+ *
+ * Deviations from posix: no -v because nothing says what it should DO.
+
+USE_GETCONF(NEWTOY(getconf, "l", TOYFLAG_USR|TOYFLAG_BIN))
+
+config GETCONF
+  bool "getconf"
+  default y
+  help
+    usage: getconf [-l] [NAME...]
+
+    Get system configuration values.
+
+    -l	List available value names
+*/
+
+#define FOR_getconf
+#include "toys.h"
+#include <limits.h>
+
+// make.sh calls sed on this file (getconf.c) to extract symbols from our three
+// XXX_names arrays and matches them with #defines in limits.h and unistd.h to
+// produce getconf.h, which contains corresponding XXX_values[] arrays
+// with the appropriate constants or -1 for unknown entries.
+
+#define UNKNOWN -1
+#include "generated/getconf.h"
+
+// Lists of symbols getconf can query, broken down by whether we call sysconf(),
+// getconf(), or output the macro value directly.
+
+// Probe the live system
+char *sysconf_names[] = {
+  /* POSIX */
+  "_POSIX_ADVISORY_INFO", "_POSIX_BARRIERS", "_POSIX_ASYNCHRONOUS_IO",
+  "_POSIX_CLOCK_SELECTION", "_POSIX_CPUTIME", "_POSIX_FSYNC", "_POSIX_IPV6",
+  "_POSIX_JOB_CONTROL", "_POSIX_MAPPED_FILES", "_POSIX_MEMLOCK",
+  "_POSIX_MEMLOCK_RANGE", "_POSIX_MEMORY_PROTECTION", "_POSIX_MESSAGE_PASSING",
+  "_POSIX_MONOTONIC_CLOCK", "_POSIX_PRIORITIZED_IO",
+  "_POSIX_PRIORITY_SCHEDULING", "_POSIX_RAW_SOCKETS",
+  "_POSIX_READER_WRITER_LOCKS", "_POSIX_REALTIME_SIGNALS", "_POSIX_REGEXP",
+  "_POSIX_SAVED_IDS", "_POSIX_SEMAPHORES", "_POSIX_SHARED_MEMORY_OBJECTS",
+  "_POSIX_SHELL", "_POSIX_SPAWN", "_POSIX_SPIN_LOCKS", "_POSIX_SPORADIC_SERVER",
+  "_POSIX_SS_REPL_MAX", "_POSIX_SYNCHRONIZED_IO",
+  "_POSIX_THREAD_ATTR_STACKADDR", "_POSIX_THREAD_ATTR_STACKSIZE",
+  "_POSIX_THREAD_CPUTIME", "_POSIX_THREAD_PRIO_INHERIT",
+  "_POSIX_THREAD_PRIO_PROTECT", "_POSIX_THREAD_PRIORITY_SCHEDULING",
+  "_POSIX_THREAD_PROCESS_SHARED", "_POSIX_THREAD_ROBUST_PRIO_INHERIT",
+  "_POSIX_THREAD_ROBUST_PRIO_PROTECT", "_POSIX_THREAD_SAFE_FUNCTIONS",
+  "_POSIX_THREAD_SPORADIC_SERVER", "_POSIX_THREADS", "_POSIX_TIMEOUTS",
+  "_POSIX_TIMERS", "_POSIX_TRACE", "_POSIX_TRACE_EVENT_FILTER",
+  "_POSIX_TRACE_EVENT_NAME_MAX", "_POSIX_TRACE_INHERIT", "_POSIX_TRACE_LOG",
+  "_POSIX_TRACE_NAME_MAX", "_POSIX_TRACE_SYS_MAX",
+  "_POSIX_TRACE_USER_EVENT_MAX", "_POSIX_TYPED_MEMORY_OBJECTS",
+  "_POSIX_VERSION", "_POSIX_V7_ILP32_OFF32", "_POSIX_V7_ILP32_OFFBIG",
+  "_POSIX_V7_LP64_OFF64", "_POSIX_V7_LPBIG_OFFBIG",
+
+  /* POSIX.2 */
+  "_POSIX2_C_BIND", "_POSIX2_C_DEV", "_POSIX2_CHAR_TERM", "_POSIX2_FORT_DEV",
+  "_POSIX2_FORT_RUN", "_POSIX2_LOCALEDEF", "_POSIX2_PBS",
+  "_POSIX2_PBS_ACCOUNTING", "_POSIX2_PBS_CHECKPOINT", "_POSIX2_PBS_LOCATE",
+  "_POSIX2_PBS_MESSAGE", "_POSIX2_PBS_TRACK", "_POSIX2_SW_DEV", "_POSIX2_UPE",
+  "_POSIX2_VERSION",
+
+  /* X/Open */
+  "_XOPEN_CRYPT", "_XOPEN_ENH_I18N", "_XOPEN_REALTIME",
+  "_XOPEN_REALTIME_THREADS", "_XOPEN_SHM", "_XOPEN_STREAMS", "_XOPEN_UNIX",
+  "_XOPEN_UUCP", "_XOPEN_VERSION",
+
+  /* No obvious standard */
+  "AIO_LISTIO_MAX", "AIO_MAX", "AIO_PRIO_DELTA_MAX", "ARG_MAX", "ATEXIT_MAX",
+  "BC_BASE_MAX", "BC_DIM_MAX", "BC_SCALE_MAX", "BC_STRING_MAX", "CHILD_MAX",
+  "COLL_WEIGHTS_MAX", "DELAYTIMER_MAX", "EXPR_NEST_MAX", "HOST_NAME_MAX",
+  "IOV_MAX", "LINE_MAX", "LOGIN_NAME_MAX", "NGROUPS_MAX", "MQ_OPEN_MAX",
+  "MQ_PRIO_MAX", "OPEN_MAX", "PAGE_SIZE", "PAGESIZE",
+  "PTHREAD_DESTRUCTOR_ITERATIONS", "PTHREAD_KEYS_MAX", "PTHREAD_STACK_MIN",
+  "PTHREAD_THREADS_MAX", "RE_DUP_MAX", "RTSIG_MAX", "SEM_NSEMS_MAX",
+  "SEM_VALUE_MAX", "SIGQUEUE_MAX", "STREAM_MAX", "SYMLOOP_MAX", "TIMER_MAX",
+  "TTY_NAME_MAX", "TZNAME_MAX", "NPROCESSORS_CONF", "NPROCESSORS_ONLN"
+};
+
+// Strings out of a header
+char *confstr_names[] = {
+  "PATH", "V7_ENV"
+};
+
+// Integers out of a header
+char *limit_names[] = {
+  "_POSIX_AIO_LISTIO_MAX", "_POSIX_AIO_MAX", "_POSIX_ARG_MAX",
+  "_POSIX_CHILD_MAX", "_POSIX_DELAYTIMER_MAX", "_POSIX_HOST_NAME_MAX",
+  "_POSIX_LINK_MAX", "_POSIX_LOGIN_NAME_MAX", "_POSIX_MAX_CANON",
+  "_POSIX_MAX_INPUT", "_POSIX_NAME_MAX", "_POSIX_NGROUPS_MAX",
+  "_POSIX_OPEN_MAX", "_POSIX_PATH_MAX", "_POSIX_PIPE_BUF", "_POSIX_RE_DUP_MAX",
+  "_POSIX_RTSIG_MAX", "_POSIX_SEM_NSEMS_MAX", "_POSIX_SEM_VALUE_MAX",
+  "_POSIX_SIGQUEUE_MAX", "_POSIX_SSIZE_MAX", "_POSIX_STREAM_MAX",
+  "_POSIX_SYMLINK_MAX", "_POSIX_SYMLOOP_MAX",
+  "_POSIX_THREAD_DESTRUCTOR_ITERATIONS", "_POSIX_THREAD_KEYS_MAX",
+  "_POSIX_THREAD_THREADS_MAX", "_POSIX_TIMER_MAX", "_POSIX_TTY_NAME_MAX",
+  "_POSIX_TZNAME_MAX", "_POSIX2_BC_BASE_MAX", "_POSIX2_BC_DIM_MAX",
+  "_POSIX2_BC_SCALE_MAX", "_POSIX2_BC_STRING_MAX", "_POSIX2_CHARCLASS_NAME_MAX",
+  "_POSIX2_COLL_WEIGHTS_MAX", "_POSIX2_EXPR_NEST_MAX", "_POSIX2_LINE_MAX",
+  "_POSIX2_RE_DUP_MAX"
+};
+
+void getconf_main(void)
+{
+  char **names[] = {sysconf_names, confstr_names, limit_names},
+    **args;
+  int i, j, lens[] = {ARRAY_LEN(sysconf_names),
+    ARRAY_LEN(confstr_names), ARRAY_LEN(limit_names)};
+
+  if (toys.optflags&FLAG_l) {
+    for (i = 0; i<3; i++) for (j = 0; j<lens[i]; j++) puts(names[i][j]);
+
+    return;
+  }
+
+  for (args = toys.optargs; *args; args++) {
+    char *name = *args;
+
+    // Workaround for autogen using CS_PATH instead of PATH
+    if (!strcmp("CS_PATH", name)) name += 3;
+
+    for (i = 0; i<3; i++) for (j = 0; j<lens[i]; j++) {
+      if (strcmp(names[i][j], name)) continue;
+
+      if (!i) printf("%ld\n", sysconf(sysconf_vals[j]));
+      else if (i==1) {
+        confstr(confstr_vals[j], toybuf, sizeof(toybuf));
+        puts(toybuf);
+      } else printf("%d\n", limit_vals[j]);
+
+      goto cont;
+    }
+    error_msg("bad '%s'", name);
+cont:
+    ;
+  }
+}