Add a "fork" of musl as //fusl.

fusl/src/conf/sysconf.c

Index: fusl/src/conf/sysconf.c
diff --git a/fusl/src/conf/sysconf.c b/fusl/src/conf/sysconf.c
new file mode 100644
index 0000000000000000000000000000000000000000..b8b761d01a3156c644179dfe8aeb670d34b36a31
--- /dev/null
+++ b/fusl/src/conf/sysconf.c
@@ -0,0 +1,215 @@
+#include <unistd.h>
+#include <limits.h>
+#include <errno.h>
+#include <sys/resource.h>
+#include <signal.h>
+#include <sys/sysinfo.h>
+#include "syscall.h"
+#include "libc.h"
+
+#define JT(x) (-256|(x))
+#define VER JT(1)
+#define JT_ARG_MAX JT(2)
+#define JT_MQ_PRIO_MAX JT(3)
+#define JT_PAGE_SIZE JT(4)
+#define JT_SEM_VALUE_MAX JT(5)
+#define JT_NPROCESSORS_CONF JT(6)
+#define JT_NPROCESSORS_ONLN JT(7)
+#define JT_PHYS_PAGES JT(8)
+#define JT_AVPHYS_PAGES JT(9)
+#define JT_ZERO JT(10)
+
+#define RLIM(x) (-32768|(RLIMIT_ ## x))
+
+long sysconf(int name)
+{
+	static const short values[] = {
+		[_SC_ARG_MAX] = JT_ARG_MAX,
+		[_SC_CHILD_MAX] = RLIM(NPROC),
+		[_SC_CLK_TCK] = 100,
+		[_SC_NGROUPS_MAX] = 32,
+		[_SC_OPEN_MAX] = RLIM(NOFILE),
+		[_SC_STREAM_MAX] = -1,
+		[_SC_TZNAME_MAX] = TZNAME_MAX,
+		[_SC_JOB_CONTROL] = 1,
+		[_SC_SAVED_IDS] = 1,
+		[_SC_REALTIME_SIGNALS] = 1,
+		[_SC_PRIORITY_SCHEDULING] = -1,
+		[_SC_TIMERS] = VER,
+		[_SC_ASYNCHRONOUS_IO] = VER,
+		[_SC_PRIORITIZED_IO] = -1,
+		[_SC_SYNCHRONIZED_IO] = -1,
+		[_SC_FSYNC] = VER,
+		[_SC_MAPPED_FILES] = VER,
+		[_SC_MEMLOCK] = VER,
+		[_SC_MEMLOCK_RANGE] = VER,
+		[_SC_MEMORY_PROTECTION] = VER,
+		[_SC_MESSAGE_PASSING] = VER,
+		[_SC_SEMAPHORES] = VER,
+		[_SC_SHARED_MEMORY_OBJECTS] = VER,
+		[_SC_AIO_LISTIO_MAX] = -1,
+		[_SC_AIO_MAX] = -1,
+		[_SC_AIO_PRIO_DELTA_MAX] = JT_ZERO, /* ?? */
+		[_SC_DELAYTIMER_MAX] = _POSIX_DELAYTIMER_MAX,
+		[_SC_MQ_OPEN_MAX] = -1,
+		[_SC_MQ_PRIO_MAX] = JT_MQ_PRIO_MAX,
+		[_SC_VERSION] = VER,
+		[_SC_PAGE_SIZE] = JT_PAGE_SIZE,
+		[_SC_RTSIG_MAX] = _NSIG - 1 - 31 - 3,
+		[_SC_SEM_NSEMS_MAX] = SEM_NSEMS_MAX,
+		[_SC_SEM_VALUE_MAX] = JT_SEM_VALUE_MAX,
+		[_SC_SIGQUEUE_MAX] = -1,
+		[_SC_TIMER_MAX] = -1,
+		[_SC_BC_BASE_MAX] = _POSIX2_BC_BASE_MAX,
+		[_SC_BC_DIM_MAX] = _POSIX2_BC_DIM_MAX,
+		[_SC_BC_SCALE_MAX] = _POSIX2_BC_SCALE_MAX,
+		[_SC_BC_STRING_MAX] = _POSIX2_BC_STRING_MAX,
+		[_SC_COLL_WEIGHTS_MAX] = COLL_WEIGHTS_MAX,
+		[_SC_EXPR_NEST_MAX] = -1,
+		[_SC_LINE_MAX] = -1,
+		[_SC_RE_DUP_MAX] = RE_DUP_MAX,
+		[_SC_2_VERSION] = VER,
+		[_SC_2_C_BIND] = VER,
+		[_SC_2_C_DEV] = -1,
+		[_SC_2_FORT_DEV] = -1,
+		[_SC_2_FORT_RUN] = -1,
+		[_SC_2_SW_DEV] = -1,
+		[_SC_2_LOCALEDEF] = -1,
+		[_SC_IOV_MAX] = IOV_MAX,
+		[_SC_THREADS] = VER,
+		[_SC_THREAD_SAFE_FUNCTIONS] = VER,
+		[_SC_GETGR_R_SIZE_MAX] = -1,
+		[_SC_GETPW_R_SIZE_MAX] = -1,
+		[_SC_LOGIN_NAME_MAX] = 256,
+		[_SC_TTY_NAME_MAX] = TTY_NAME_MAX,
+		[_SC_THREAD_DESTRUCTOR_ITERATIONS] = PTHREAD_DESTRUCTOR_ITERATIONS,
+		[_SC_THREAD_KEYS_MAX] = PTHREAD_KEYS_MAX,
+		[_SC_THREAD_STACK_MIN] = PTHREAD_STACK_MIN,
+		[_SC_THREAD_THREADS_MAX] = -1,
+		[_SC_THREAD_ATTR_STACKADDR] = VER,
+		[_SC_THREAD_ATTR_STACKSIZE] = VER,
+		[_SC_THREAD_PRIORITY_SCHEDULING] = VER,
+		[_SC_THREAD_PRIO_INHERIT] = -1,
+		[_SC_THREAD_PRIO_PROTECT] = -1,
+		[_SC_THREAD_PROCESS_SHARED] = VER,
+		[_SC_NPROCESSORS_CONF] = JT_NPROCESSORS_CONF,
+		[_SC_NPROCESSORS_ONLN] = JT_NPROCESSORS_ONLN,
+		[_SC_PHYS_PAGES] = JT_PHYS_PAGES,
+		[_SC_AVPHYS_PAGES] = JT_AVPHYS_PAGES,
+		[_SC_ATEXIT_MAX] = -1,
+		[_SC_PASS_MAX] = -1,
+		[_SC_XOPEN_VERSION] = _XOPEN_VERSION,
+		[_SC_XOPEN_XCU_VERSION] = _XOPEN_VERSION,
+		[_SC_XOPEN_UNIX] = 1,
+		[_SC_XOPEN_CRYPT] = -1,
+		[_SC_XOPEN_ENH_I18N] = 1,
+		[_SC_XOPEN_SHM] = 1,
+		[_SC_2_CHAR_TERM] = -1,
+		[_SC_2_UPE] = -1,
+		[_SC_XOPEN_XPG2] = -1,
+		[_SC_XOPEN_XPG3] = -1,
+		[_SC_XOPEN_XPG4] = -1,
+		[_SC_NZERO] = NZERO,
+		[_SC_XBS5_ILP32_OFF32] = -1,
+		[_SC_XBS5_ILP32_OFFBIG] = sizeof(long)==4 ? 1 : JT_ZERO,
+		[_SC_XBS5_LP64_OFF64] = sizeof(long)==8 ? 1 : JT_ZERO,
+		[_SC_XBS5_LPBIG_OFFBIG] = -1,
+		[_SC_XOPEN_LEGACY] = -1,
+		[_SC_XOPEN_REALTIME] = -1,
+		[_SC_XOPEN_REALTIME_THREADS] = -1,
+		[_SC_ADVISORY_INFO] = VER,
+		[_SC_BARRIERS] = VER,
+		[_SC_CLOCK_SELECTION] = VER,
+		[_SC_CPUTIME] = VER,
+		[_SC_THREAD_CPUTIME] = VER,
+		[_SC_MONOTONIC_CLOCK] = VER,
+		[_SC_READER_WRITER_LOCKS] = VER,
+		[_SC_SPIN_LOCKS] = VER,
+		[_SC_REGEXP] = 1,
+		[_SC_SHELL] = 1,
+		[_SC_SPAWN] = VER,
+		[_SC_SPORADIC_SERVER] = -1,
+		[_SC_THREAD_SPORADIC_SERVER] = -1,
+		[_SC_TIMEOUTS] = VER,
+		[_SC_TYPED_MEMORY_OBJECTS] = -1,
+		[_SC_2_PBS] = -1,
+		[_SC_2_PBS_ACCOUNTING] = -1,
+		[_SC_2_PBS_LOCATE] = -1,
+		[_SC_2_PBS_MESSAGE] = -1,
+		[_SC_2_PBS_TRACK] = -1,
+		[_SC_SYMLOOP_MAX] = SYMLOOP_MAX,
+		[_SC_STREAMS] = JT_ZERO,
+		[_SC_2_PBS_CHECKPOINT] = -1,
+		[_SC_V6_ILP32_OFF32] = -1,
+		[_SC_V6_ILP32_OFFBIG] = sizeof(long)==4 ? 1 : JT_ZERO,
+		[_SC_V6_LP64_OFF64] = sizeof(long)==8 ? 1 : JT_ZERO,
+		[_SC_V6_LPBIG_OFFBIG] = -1,
+		[_SC_HOST_NAME_MAX] = HOST_NAME_MAX,
+		[_SC_TRACE] = -1,
+		[_SC_TRACE_EVENT_FILTER] = -1,
+		[_SC_TRACE_INHERIT] = -1,
+		[_SC_TRACE_LOG] = -1,
+
+		[_SC_IPV6] = VER,
+		[_SC_RAW_SOCKETS] = VER,
+		[_SC_V7_ILP32_OFF32] = -1,
+		[_SC_V7_ILP32_OFFBIG] = sizeof(long)==4 ? 1 : JT_ZERO,
+		[_SC_V7_LP64_OFF64] = sizeof(long)==8 ? 1 : JT_ZERO,
+		[_SC_V7_LPBIG_OFFBIG] = -1,
+		[_SC_SS_REPL_MAX] = -1,
+		[_SC_TRACE_EVENT_NAME_MAX] = -1,
+		[_SC_TRACE_NAME_MAX] = -1,
+		[_SC_TRACE_SYS_MAX] = -1,
+		[_SC_TRACE_USER_EVENT_MAX] = -1,
+		[_SC_XOPEN_STREAMS] = JT_ZERO,
+		[_SC_THREAD_ROBUST_PRIO_INHERIT] = -1,
+		[_SC_THREAD_ROBUST_PRIO_PROTECT] = -1,
+	};
+
+	if (name >= sizeof(values)/sizeof(values[0]) || !values[name]) {
+		errno = EINVAL;
+		return -1;
+	} else if (values[name] >= -1) {
+		return values[name];
+	} else if (values[name] < -256) {
+		struct rlimit lim;
+		getrlimit(values[name]&16383, &lim);
+		return lim.rlim_cur > LONG_MAX ? LONG_MAX : lim.rlim_cur;
+	}
+
+	switch ((unsigned char)values[name]) {
+	case VER & 255:
+		return _POSIX_VERSION;
+	case JT_ARG_MAX & 255:
+		return ARG_MAX;
+	case JT_MQ_PRIO_MAX & 255:
+		return MQ_PRIO_MAX;
+	case JT_PAGE_SIZE & 255:
+		return PAGE_SIZE;
+	case JT_SEM_VALUE_MAX & 255:
+		return SEM_VALUE_MAX;
+	case JT_NPROCESSORS_CONF & 255:
+	case JT_NPROCESSORS_ONLN & 255: ;
+		unsigned char set[128] = {1};
+		int i, cnt;
+		__syscall(SYS_sched_getaffinity, 0, sizeof set, set);
+		for (i=cnt=0; i<sizeof set; i++)
+			for (; set[i]; set[i]&=set[i]-1, cnt++);
+		return cnt;
+	case JT_PHYS_PAGES & 255:
+	case JT_AVPHYS_PAGES & 255: ;
+		unsigned long long mem;
+		int __lsysinfo(struct sysinfo *);
+		struct sysinfo si;
+		__lsysinfo(&si);
+		if (!si.mem_unit) si.mem_unit = 1;
+		if (name==_SC_PHYS_PAGES) mem = si.totalram;
+		else mem = si.freeram + si.bufferram;
+		mem *= si.mem_unit;
+		mem /= PAGE_SIZE;
+		return (mem > LONG_MAX) ? LONG_MAX : mem;
+	case JT_ZERO & 255:
+		return 0;
+	}
+	return values[name];
+}