On Fri, Apr 01, 2016 at 12:33:32AM +0200, Richard Weinberger wrote: > From: David Gstir <da...@sigma-star.at> > > Implement the leftpad() system call such that userspace, > especially node.js applications, can in the near future directly > use it and no longer depend on fragile npm packages. > > Signed-off-by: David Gstir <da...@sigma-star.at> > Signed-off-by: Richard Weinberger <rich...@nod.at> > --- > arch/x86/entry/syscalls/syscall_64.tbl | 1 + > include/linux/syscalls.h | 1 + > kernel/sys.c | 35 > ++++++++++++++++++++++++++++++++++ > kernel/sys_ni.c | 1 + > 4 files changed, 38 insertions(+) > > diff --git a/arch/x86/entry/syscalls/syscall_64.tbl > b/arch/x86/entry/syscalls/syscall_64.tbl > index cac6d17..f287712 100644 > --- a/arch/x86/entry/syscalls/syscall_64.tbl > +++ b/arch/x86/entry/syscalls/syscall_64.tbl > @@ -335,6 +335,7 @@ > 326 common copy_file_range sys_copy_file_range > 327 64 preadv2 sys_preadv2 > 328 64 pwritev2 sys_pwritev2 > +329 common leftpad sys_leftpad > > # > # x32-specific system call numbers start at 512 to avoid cache impact > diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h > index d795472..a0850bb 100644 > --- a/include/linux/syscalls.h > +++ b/include/linux/syscalls.h > @@ -898,4 +898,5 @@ asmlinkage long sys_copy_file_range(int fd_in, loff_t > __user *off_in, > > asmlinkage long sys_mlock2(unsigned long start, size_t len, int flags); > > +asmlinkage long sys_leftpad(char *str, char pad, char *dst, size_t dst_len); > #endif > diff --git a/kernel/sys.c b/kernel/sys.c > index cf8ba54..e42d972 100644 > --- a/kernel/sys.c > +++ b/kernel/sys.c > @@ -2432,3 +2432,38 @@ COMPAT_SYSCALL_DEFINE1(sysinfo, struct compat_sysinfo > __user *, info) > return 0; > } > #endif /* CONFIG_COMPAT */ > + > + > +SYSCALL_DEFINE4(leftpad, char *, src, char, pad, char *, dst, size_t, > dst_len)
Have you considered /dev/leftpad instead?
