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Added debugging output to pv_in_foreground()

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This commit is contained in:
Andrew Wood
2023-07-16 21:31:17 +01:00
parent 3403ebd857
commit c8090806f9
1 changed files with 14 additions and 3 deletions
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src/pv/display.c
+14 -3
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@@ -43,17 +43,28 @@ bool pv_in_foreground(void)
pid_t our_process_group;
pid_t tty_process_group;
if (0 == isatty(STDERR_FILENO))
if (0 == isatty(STDERR_FILENO)) {
debug("%s: true: %s", "pv_in_foreground", "not a tty");
return true;
}
our_process_group = getpgrp();
tty_process_group = tcgetpgrp(STDERR_FILENO);
if (tty_process_group == -1 && errno == ENOTTY)
if (tty_process_group == -1 && errno == ENOTTY) {
debug("%s: true: %s", "pv_in_foreground",
"tty_process_group is -1, errno is ENOTTY");
return true;
}
if (our_process_group == tty_process_group)
if (our_process_group == tty_process_group) {
debug("%s: true: %s", "pv_in_foreground",
"our_process_group == tty_process_group");
return true;
}
debug("%s: false: our_process_group=%d, tty_process_group=%d",
"pv_in_foreground", our_process_group, tty_process_group);
return false;
}