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cooperate with nohup

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If SIGHUP is initially ignored, don't set a SIGHUP handler.
This commit is contained in:
Matthew Flatt 2021-02-11 15:25:22 -07:00
parent 27c7f45937
commit eba9be1b39
2 changed files with 15 additions and 1 deletions
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8
racket/src/bc/src/salloc.c
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@ -462,6 +462,14 @@ void scheme_set_signal_handler(int sig_id, Scheme_Signal_Handler_Proc proc) XFOR
{
#ifndef WINDOWS_PROCESSES
struct sigaction sa;
if (sig_id == SIGHUP) {
/* cooperate with `nohup` by keeping SIHGUP as-is when ignored */
sigaction(SIGHUP, NULL, &sa);
if (sa.sa_handler == SIG_IGN)
return;
}
sigemptyset(&sa.sa_mask);
sa.sa_flags = 0;
sa.sa_handler = (proc ? proc : SIG_IGN);

6
racket/src/rktio/rktio_signal.c
View File

@ -68,7 +68,13 @@ void rktio_install_os_signal_handler(rktio_t *rktio)
#if defined(RKTIO_SYSTEM_UNIX)
rktio_set_signal_handler(SIGINT, user_break_hit);
rktio_set_signal_handler(SIGTERM, term_hit);
{
struct sigaction sa;
sigemptyset(&sa.sa_mask);
sigaction(SIGHUP, NULL, &sa);
if (sa.sa_handler != SIG_IGN)
rktio_set_signal_handler(SIGHUP, hup_hit);
}
#endif
#if defined(RKTIO_SYSTEM_WINDOWS)