From 7c46a8f234d618d7471e6b09d480688270a33fe3 Mon Sep 17 00:00:00 2001 From: Ian Moffett Date: Fri, 10 Oct 2025 19:44:32 -0400 Subject: kern: proc: Add getargv system call Introduce a getargv system call that allows one to fetch an argument string using an index into the argument vector. Signed-off-by: Ian Moffett --- src/sys/os/os_proc.c | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) (limited to 'src/sys/os/os_proc.c') diff --git a/src/sys/os/os_proc.c b/src/sys/os/os_proc.c index 27ffac8..4af45a0 100644 --- a/src/sys/os/os_proc.c +++ b/src/sys/os/os_proc.c @@ -320,3 +320,28 @@ sys_spawn(struct syscall_args *scargs) envblk = penv_blk_cpy(proc_self(), u_blk); return proc_spawn(buf, envblk); } + +/* + * Get argument number number + * + * ARG0: Argument number + * ARG1: Buffer result + * ARG2: Max length + */ +scret_t +sys_getargv(struct syscall_args *scargs) +{ + uint16_t argno = SCARG(scargs, uint16_t, 0); + char *u_buf = SCARG(scargs, char *, 1); + size_t maxlen = SCARG(scargs, size_t, 2); + struct proc *self = proc_self(); + struct penv_blk *envblk = self->envblk; + char *arg; + + if (argno >= envblk->argc) { + return -EINVAL; + } + + arg = envblk->argv[argno]; + return copyoutstr(arg, u_buf, maxlen); +} -- cgit v1.2.3