From f38163772cb8ca25c440393132e8678e65437320 Mon Sep 17 00:00:00 2001 From: David Oberhollenzer Date: Sun, 16 Sep 2018 21:52:46 +0200 Subject: Add simple cron implementation Signed-off-by: David Oberhollenzer --- lib/util/argv_exec.c | 67 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 67 insertions(+) create mode 100644 lib/util/argv_exec.c (limited to 'lib/util') diff --git a/lib/util/argv_exec.c b/lib/util/argv_exec.c new file mode 100644 index 0000000..e39153c --- /dev/null +++ b/lib/util/argv_exec.c @@ -0,0 +1,67 @@ +/* SPDX-License-Identifier: GPL-3.0-or-later */ +/* + * Copyright (C) 2018 - David Oberhollenzer + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see . + */ +#include "service.h" + +#include +#include +#include +#include +#include + +int setup_tty(const char *tty, bool truncate) +{ + int fd; + + if (tty == NULL) + return 0; + + fd = open(tty, O_RDWR); + if (fd < 0) { + perror(tty); + return -1; + } + + if (truncate) + ftruncate(fd, 0); + + close(STDIN_FILENO); + close(STDOUT_FILENO); + close(STDERR_FILENO); + + setsid(); + + dup2(fd, STDIN_FILENO); + dup2(fd, STDOUT_FILENO); + dup2(fd, STDERR_FILENO); + close(fd); + return 0; +} + +void argv_exec(exec_t *e) +{ + char **argv = alloca(e->argc + 1), *ptr; + int i; + + for (ptr = e->args, i = 0; i < e->argc; ++i, ptr += strlen(ptr) + 1) + argv[i] = ptr; + + argv[i] = NULL; + execvp(argv[0], argv); + perror(argv[0]); + exit(EXIT_FAILURE); +} -- cgit v1.2.3