Implement syscall listing

[lttng-modules.git] / lttng-syscalls.c

diff --git a/lttng-syscalls.c b/lttng-syscalls.c
index c23f1d9e7e5b07c7533e14f2fdf404763152ea8c..25b8431a7c1ed3fa64141959ac2f015ba56a8879 100644 (file)
--- a/lttng-syscalls.c
+++ b/lttng-syscalls.c
@@ -27,6 +27,7 @@
 #include <linux/bitmap.h>
 #include <linux/in.h>
 #include <linux/in6.h>
+#include <linux/seq_file.h>
 #include <asm/ptrace.h>
 #include <asm/syscall.h>
 
@@ -1070,3 +1071,86 @@ error:
                kfree(filter);
        return ret;
 }
+
+static
+const struct trace_syscall_entry *syscall_list_get_entry(loff_t *pos)
+{
+       const struct trace_syscall_entry *entry;
+       int iter = 0;
+
+       for (entry = sc_table;
+                       entry < sc_table + ARRAY_SIZE(sc_table);
+                        entry++) {
+               if (iter++ >= *pos)
+                       return entry;
+       }
+       for (entry = compat_sc_table;
+                       entry < compat_sc_table + ARRAY_SIZE(compat_sc_table);
+                        entry++) {
+               if (iter++ >= *pos)
+                       return entry;
+       }
+       /* End of list */
+       return NULL;
+}
+
+static
+void *syscall_list_start(struct seq_file *m, loff_t *pos)
+{
+       return (void *) syscall_list_get_entry(pos);
+}
+
+static
+void *syscall_list_next(struct seq_file *m, void *p, loff_t *ppos)
+{
+       (*ppos)++;
+       return (void *) syscall_list_get_entry(ppos);
+}
+
+static
+void syscall_list_stop(struct seq_file *m, void *p)
+{
+}
+
+static
+int syscall_list_show(struct seq_file *m, void *p)
+{
+       const struct trace_syscall_entry *table, *entry = p;
+       unsigned int bitness;
+
+       if (entry >= sc_table && entry < sc_table + ARRAY_SIZE(sc_table)) {
+               bitness = BITS_PER_LONG;
+               table = sc_table;
+       } else {
+               bitness = 32;
+               table = compat_sc_table;
+               WARN_ON_ONCE(!(entry >= compat_sc_table
+                       && entry < compat_sc_table + ARRAY_SIZE(compat_sc_table)));
+       }
+       seq_printf(m,   "syscall { name = %s; bitness = %u; };\n",
+               entry->desc->name,
+               bitness);
+       return 0;
+}
+
+static
+const struct seq_operations lttng_syscall_list_seq_ops = {
+       .start = syscall_list_start,
+       .next = syscall_list_next,
+       .stop = syscall_list_stop,
+       .show = syscall_list_show,
+};
+
+static
+int lttng_syscall_list_open(struct inode *inode, struct file *file)
+{
+       return seq_open(file, &lttng_syscall_list_seq_ops);
+}
+
+const struct file_operations lttng_syscall_list_fops = {
+       .owner = THIS_MODULE,
+       .open = lttng_syscall_list_open,
+       .read = seq_read,
+       .llseek = seq_lseek,
+       .release = seq_release,
+};