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Make exec sockets nonblocking. Fix FD leakage when more than one exec is running.

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This commit is contained in:
Ian Gulliver
2016-03-10 21:36:40 -08:00
parent 3bcbc0cbb0
commit c5f117dce5
1 changed files with 6 additions and 5 deletions
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11
adsbus/exec.c
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@@ -1,4 +1,5 @@
#include <assert.h>
#include <fcntl.h>
#include <signal.h>
#include <stdlib.h>
#include <string.h>
@@ -166,9 +167,11 @@ static void __attribute__ ((noreturn)) exec_child(const struct exec *exec, int d
static void exec_spawn(struct exec *exec) {
LOG(exec->id, "Executing: %s", exec->command);
int data_fds[2], log_fds[2];
// Leave these sockets blocking; we move in lock step with subprograms
assert(!socketpair(AF_UNIX, SOCK_STREAM, 0, data_fds));
assert(!socketpair(AF_UNIX, SOCK_STREAM, 0, log_fds));
assert(!socketpair(AF_UNIX, SOCK_STREAM | SOCK_NONBLOCK, 0, data_fds));
assert(!socketpair(AF_UNIX, SOCK_STREAM | SOCK_NONBLOCK, 0, log_fds));
assert(!fcntl(data_fds[0], F_SETFD, FD_CLOEXEC));
assert(!fcntl(log_fds[0], F_SETFD, FD_CLOEXEC));
int res = fork();
assert(res >= 0);
@@ -178,8 +181,6 @@ static void exec_spawn(struct exec *exec) {
assert(!shutdown(log_fds[0], SHUT_WR));
exec_parent(exec, res, data_fds[0], log_fds[0]);
} else {
assert(!close(data_fds[0]));
assert(!close(log_fds[0]));
exec_child(exec, data_fds[1], log_fds[1]);
}
}