First commit

Signed-off-by: Mattias Andrée <maandree@kth.se>

1 files changed, 37 insertions, 0 deletions

diff --git a/libsyscalls_get_syscall.c b/libsyscalls_get_syscall.c
new file mode 100644
index 0000000..aea4d2f
--- /dev/null
+++ b/libsyscalls_get_syscall.c
@@ -0,0 +1,37 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+
+
+enum libsyscalls_error
+libsyscalls_get_syscall(enum libsyscalls_os os, enum libsyscalls_arch arch, long long int syscallnr,
+                        const struct libsyscalls_syscall **syscall_out)
+{
+	const struct libsyscalls_syscall *syscalldesc;
+	static enum libsyscalls_error error;
+	long long int min, max;
+
+	error = libsyscalls_get_syscall_range(os, arch, &min, &max);
+	if (error)
+		return error;
+
+	if (syscallnr < min || syscallnr > max)
+		return LIBSYSCALLS_E_NOSUCHSYSCALL;
+
+	/* buffer access is validated by libsyscalls_get_syscall_range() */
+#if defined(__clang__)
+# pragma clang diagnostic push
+# pragma clang diagnostic ignored "-Wunsafe-buffer-usage"
+#endif
+
+	syscalldesc = libsyscalls_syscalls_tables_[os][arch][syscallnr - min];
+
+#if defined(__clang__)
+# pragma clang diagnostic pop
+#endif
+
+	if (!syscalldesc)
+		return LIBSYSCALLS_E_NOSUCHSYSCALL;
+	if (syscall_out)
+		*syscall_out = syscalldesc;
+	return LIBSYSCALLS_E_OK;
+}