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#!/usr/bin/env python3
import sys
import os
syscall_names = []
for line in sys.stdin:
fields = line.split()
if len(fields) == 3 and fields[0] == '#define':
name = fields[1]
if name[:5] == '__NR_':
syscall_names.insert(0, name[5:])
print('''#include<sys/syscall.h>
#include<stddef.h>
struct syscallname {
int sysno;
char *syscall_name;
struct syscallname *next;
};
static struct syscallname syscallname_table[] = {''')
for name in syscall_names:
print(f'''#ifdef __NR_{name}
{{__NR_{name}, "{name}", NULL}},
#endif''')
print('};')
print('''
#define SYSCALLNAME_TABLE_LEN (sizeof(syscallname_table) / sizeof(*syscallname_table))
#define SYSCALLNAME_HASHMASK 255
static struct syscallname *syscall_name_hash[SYSCALLNAME_HASHMASK + 1];
const char *syscallname(int sysno) {
int key = sysno & SYSCALLNAME_HASHMASK;
struct syscallname *scan;
for (scan = syscall_name_hash[key]; scan != NULL; scan = scan->next)
if (sysno == scan->sysno)
return scan->syscall_name;
return "unknown";
}
__attribute__((constructor))
static void init (void) {
unsigned int i;
for (i = 0; i < SYSCALLNAME_TABLE_LEN; i++) {
int key = syscallname_table[i].sysno & SYSCALLNAME_HASHMASK;
syscallname_table[i].next = syscall_name_hash[key];
syscall_name_hash[key] = &syscallname_table[i];
}
}''')
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