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spawn/slave: restore signal mask after fork

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slave: no need to restore signal handlers; they are automatically
restored as long as they are not SIG_IGN (which they never are in
foot).

spawn(): restore signal mask after fork. This fixes an issue where a
terminal spawned with ctrl+shift+n did not terminate when its shell
exited.

Closes #366
This commit is contained in:
Daniel Eklöf 2021-02-21 11:57:38 +01:00
parent 34f89fbe72
commit dd5c31657e
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GPG key ID: 5BBD4992C116573F
4 changed files with 15 additions and 8 deletions
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11
spawn.c
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@ -3,6 +3,7 @@
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/stat.h>
@ -34,6 +35,16 @@ spawn(struct reaper *reaper, const char *cwd, char *const argv[],
/* Child */
close(pipe_fds[0]);
/* Clear signal mask */
sigset_t mask;
sigemptyset(&mask);
if (sigprocmask(SIG_SETMASK, &mask, NULL) < 0) {
const int _errno = errno;
LOG_ERRNO_P(errno, "failed to restore signals");
(void)!write(pipe_fds[1], &_errno, sizeof(_errno));
_exit(_errno);
}
if ((stdin_fd >= 0 && (dup2(stdin_fd, STDIN_FILENO) < 0 || close(stdin_fd) < 0)) ||
(stdout_fd >= 0 && (dup2(stdout_fd, STDOUT_FILENO) < 0 || close(stdout_fd) < 0)) ||
(stderr_fd >= 0 && (dup2(stderr_fd, STDERR_FILENO) < 0 || close(stderr_fd) < 0)) ||