Add support for the ulimit syscall

libc/sysdeps/linux/common/ulimit.c

@@ -0,0 +1,81 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Copyright (C) 2003 by Erik Andersen <andersen@codpoet.org>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Library General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * This program 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 Library General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Library General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+#define _GNU_SOURCE
+#define _LARGEFILE64_SOURCE
+#include <features.h>
+#undef __OPTIMIZE__
+/* We absolutely do _NOT_ want interfaces silently
+ *  *  * renamed under us or very bad things will happen... */
+#ifdef __USE_FILE_OFFSET64
+# undef __USE_FILE_OFFSET64
+#endif
+
+
+#ifdef __NR_ulimit
+
+#include <sys/types.h>
+#include <sys/syscall.h>
+
+_syscall2(long, ulimit, int, cmd, int, arg);
+
+#else
+
+#include <stdarg.h>
+#include <unistd.h>
+#include <ulimit.h>
+#include <errno.h>
+#include <sys/resource.h>
+
+long int ulimit(int cmd, ...)
+{
+	va_list va;
+	struct rlimit limit;
+	long int result = -1;
+	va_start (va, cmd);
+	switch (cmd) {
+		/* Get limit on file size.  */
+		case UL_GETFSIZE:
+			if (getrlimit(RLIMIT_FSIZE, &limit) == 0)
+				result =  limit.rlim_cur / 512; /* bytes to 512 byte blocksize */
+			break;
+		/* Set limit on file size.  */
+		case UL_SETFSIZE:
+			result = va_arg (va, long int);
+			if ((rlim_t) result > RLIM_INFINITY / 512) {
+				limit.rlim_cur = RLIM_INFINITY;
+				limit.rlim_max = RLIM_INFINITY;
+			} else {
+				limit.rlim_cur = result * 512;
+				limit.rlim_max = result * 512;
+			}
+			result = setrlimit(RLIMIT_FSIZE, &limit);
+			break;
+		case __UL_GETOPENMAX:
+			result = sysconf(_SC_OPEN_MAX);
+			break;
+		default:
+			__set_errno(EINVAL);
+	}
+	va_end (va);
+	return result;
+}
+#endif
+