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startup: register the handler for SIGWINCH much earlier

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Otherwise nano is deaf for SIGWINCHes during several milliseconds,
which can cause it to start off with wrong dimensions.

This fixes the second part of https://savannah.gnu.org/bugs/?67635.
The issue was reported, and the solution suggested, by `twofiftysix`.

Buglet has existed for a long time.
This commit is contained in:
Benno Schulenberg 2025-10-28 11:21:38 +01:00
parent c11569fb99
commit 6136b28af7
1 changed files with 15 additions and 5 deletions
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20
src/nano.c
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@ -903,6 +903,17 @@ bool scoop_stdin(void)
}
#endif
/* Register a handler for SIGWINCH because we want to handle window resizes. */
void set_up_sigwinch_handler(void)
{
#ifdef SIGWINCH
struct sigaction deed = {{0}};
deed.sa_handler = handle_sigwinch;
sigaction(SIGWINCH, &deed, NULL);
#endif
}
/* Register half a dozen signal handlers. */
void signal_init(void)
{
@ -923,11 +934,6 @@ void signal_init(void)
sigaction(SIGTERM, &deed, NULL);
#ifndef NANO_TINY
#ifdef SIGWINCH
/* Trap SIGWINCH because we want to handle window resizes. */
deed.sa_handler = handle_sigwinch;
sigaction(SIGWINCH, &deed, NULL);
#endif
#ifdef SIGTSTP
/* Prevent the suspend handler from getting interrupted. */
sigfillset(&deed.sa_mask);
@ -2154,6 +2160,10 @@ int main(int argc, char **argv)
}
}
#ifndef NANO_TINY
set_up_sigwinch_handler();
#endif
/* Curses needs TERM; if it is unset, try falling back to a VT220. */
if (getenv("TERM") == NULL)
putenv("TERM=vt220");