misc/adsb-tools
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Open stdin and stdout to something if they don't arrive open, or bad things happen.

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This commit is contained in:
Ian Gulliver
2016-03-09 18:28:00 -08:00
parent 8316739941
commit 689bfc7939
3 changed files with 17 additions and 1 deletions
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15
adsbus/stdinout.c
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@@ -13,10 +13,14 @@
static opts_group stdinout_opts;
static void stdinout_open(int fd, char *path, int flags) {
assert(open(path, flags | O_CLOEXEC | O_NOCTTY) == fd);
}
static void stdinout_reopen(int fd, char *path, int flags) {
// Presumes that all fds < fd are open
assert(!close(fd));
assert(open(path, flags | O_CLOEXEC | O_NOCTTY) == fd);
stdinout_open(fd, path, flags);
}
static bool stdinout_stdin(const char __attribute__((unused)) *arg) {
@@ -35,6 +39,15 @@ static bool stdinout_stdout(const char *arg) {
return flow_new_send_hello(fd, send_flow, serializer, NULL);
}
void stdinout_preinit() {
if (fcntl(STDIN_FILENO, F_GETFD) == -1) {
stdinout_open(STDIN_FILENO, "/dev/null", O_RDONLY);
}
if (fcntl(STDOUT_FILENO, F_GETFD) == -1) {
stdinout_open(STDOUT_FILENO, "/dev/full", O_WRONLY);
}
}
void stdinout_opts_add() {
opts_add("stdin", NULL, stdinout_stdin, stdinout_opts);
opts_add("stdout", "FORMAT", stdinout_stdout, stdinout_opts);