newlib: implement sysconf

newlib/libc/sys/jehanne/Makefile.am

@@ -8,7 +8,7 @@ if MAY_SUPPLY_SYSCALLS
 extra_objs = syscalls.o libposix_conf.o chown.o getrusage.o ids.o \
 	chmod.o sigsets.o sigaction.o sigsuspend.o sigwaitinfo.o \
 	sigtimedwait.o sigwait.o alarm.o sigqueue.o siglongjmp.o \
-	termios.o ioctl.o sysconf.o
+	termios.o ioctl.o
 else
 extra_objs =
 endif
@@ -21,7 +21,7 @@ lib_a_LIBADD = $(extra_objs)
 EXTRA_lib_a_SOURCES = libposix_conf.c syscalls.c chown.c getrusage.c \
 	ids.c chmod.c sigsets.c sigaction.c sigsuspend.c sigwaitinfo.c \
 	sigtimedwait.c sigwait.c alarm.c sigqueue.c siglongjmp.c \
-	termios.c ioctl.c sysconf.c
+	termios.c ioctl.c
 lib_a_DEPENDENCIES = $(extra_objs)
 lib_a_CCASFLAGS = $(AM_CCASFLAGS)
 lib_a_CFLAGS = $(AM_CFLAGS)

newlib/libc/sys/jehanne/libposix_conf.c

@@ -426,6 +426,44 @@ jehanne_fprint(2, "_fcntl_r(%d, %d, %d) from %#p\n", fd, cmd, arg, jehanne_getca
 	return POSIX_fcntl(errnop, fd, pcmd, arg);
 }
 
+/* sysconf is here to access <unistd.h> */
+long sysconf(int name)
+{
+	int *errnop = &_REENT->_errno;
+	PosixSysConfNames request = (PosixSysConfNames)name;
+	switch(name){
+	case _SC_ARG_MAX:
+		request = PosixSCNArgMax;
+		break;
+	case _SC_CHILD_MAX:
+		request = PosixSCNChildMax;
+		break;
+	case _SC_HOST_NAME_MAX:
+		request = PosixSCNHostNameMax;
+		break;
+	case _SC_LOGIN_NAME_MAX:
+		request = PosixSCNLoginNameMax;
+		break;
+	case _SC_CLK_TCK:
+		request = PosixSCNClockTicks;
+		break;
+	case _SC_OPEN_MAX:
+		request = PosixSCNOpenMax;
+		break;
+	case _SC_PAGESIZE:
+		request = PosixSCNPageSize;
+		break;
+	case _SC_VERSION:
+		request = PosixSCNPosixVersion;
+		break;
+	case _SC_LINE_MAX:
+		request = PosixSCNLineMax;
+		break;
+	}
+
+	return POSIX_sysconf(errnop, request);
+}
+
 int
 __fail_with_einval(void)
 {

newlib/libc/sys/jehanne/sysconf.c

@@ -1,25 +0,0 @@
-/*
- * This file is part of Jehanne.
- *
- * Copyright (C) 2019 Giacomo Tesio <giacomo@tesio.it>
- *
- * This is free software: you can redistribute it and/or modify
- * it under the terms of the GNU Affero General Public License as
- * published by the Free Software Foundation, version 3 of the License.
- *
- * Jehanne is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU Affero General Public License
- * along with Jehanne.  If not, see <http://www.gnu.org/licenses/>.
- */
-#include <errno.h>
-
-long sysconf(int name)
-{
-	/* TODO: implement. */
-	errno = ENOSYS;
-	return -1;
-}