mirror of
https://github.com/pygos/init.git
synced 2024-11-22 11:19:45 +01:00
David Oberhollenzer
87a524d931
- exec_t belongs to service.h, the main place where it is used/needed
- code for executing exec_t is moved to runsvc for the same reason
- what is left are NORETURN and ARRAY_SIZE
- the former can be replaced with direct attribute usage since
the only relevant compilers all support the attribute.
- the later is only used in 3 places and can be trivially replaced
with direct usage of sizeof().
Signed-off-by: David Oberhollenzer <goliath@infraroot.at>
115 lines
2 KiB
C
115 lines
2 KiB
C
/* SPDX-License-Identifier: ISC */
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#include "runsvc.h"
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static int setup_tty(const char *tty, bool truncate)
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{
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int fd;
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if (tty == NULL)
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return 0;
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fd = open(tty, O_RDWR);
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if (fd < 0) {
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perror(tty);
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return -1;
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}
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if (truncate)
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ftruncate(fd, 0);
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close(STDIN_FILENO);
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close(STDOUT_FILENO);
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close(STDERR_FILENO);
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setsid();
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dup2(fd, STDIN_FILENO);
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dup2(fd, STDOUT_FILENO);
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dup2(fd, STDERR_FILENO);
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close(fd);
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return 0;
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}
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static __attribute__((noreturn)) void argv_exec(exec_t *e)
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{
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char **argv = alloca(sizeof(char *) * (e->argc + 1)), *ptr;
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int i;
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for (ptr = e->args, i = 0; i < e->argc; ++i, ptr += strlen(ptr) + 1)
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argv[i] = ptr;
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argv[i] = NULL;
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execvp(argv[0], argv);
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perror(argv[0]);
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exit(EXIT_FAILURE);
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}
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static int run_sequentially(exec_t *list)
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{
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pid_t ret, pid;
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int status;
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for (; list != NULL; list = list->next) {
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if (list->next == NULL)
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argv_exec(list);
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pid = fork();
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if (pid == 0)
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argv_exec(list);
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if (pid == -1) {
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perror("fork");
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return EXIT_FAILURE;
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}
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do {
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ret = waitpid(pid, &status, 0);
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} while (ret != pid);
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if (!WIFEXITED(status))
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return EXIT_FAILURE;
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if (WEXITSTATUS(status) != EXIT_SUCCESS)
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return WEXITSTATUS(status);
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}
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return EXIT_SUCCESS;
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}
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/*****************************************************************************/
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int main(int argc, char **argv)
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{
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service_t *svc = NULL;
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int dirfd;
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if (argc != 3) {
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fputs("usage: runsvc <directory> <filename>\n", stderr);
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return EXIT_FAILURE;
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}
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if (getppid() != 1) {
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fputs("must be run by init!\n", stderr);
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return EXIT_FAILURE;
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}
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dirfd = open(argv[1], O_RDONLY | O_DIRECTORY);
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if (dirfd < 0) {
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perror(argv[1]);
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return EXIT_FAILURE;
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}
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svc = rdsvc(dirfd, argv[2], RDSVC_NO_FNAME | RDSVC_NO_DEPS);
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close(dirfd);
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if (svc == NULL)
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return EXIT_FAILURE;
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if (initenv())
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return EXIT_FAILURE;
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if (setup_tty(svc->ctty, (svc->flags & SVC_FLAG_TRUNCATE_OUT) != 0))
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return EXIT_FAILURE;
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return run_sequentially(svc->exec);
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}
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