xtime: Call tzset() from main() instead of lazily

POSIX specifies[1] that

    If a thread accesses tzname, daylight, or timezone directly while
    another thread is in a call to tzset(), or to any function that is
    required or allowed to set timezone information as if by calling
    tzset(), the behavior is undefined.

So calling it lazily from arbitrary threads is risky.

[1]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/tzset.html

1 files changed, 4 insertions, 0 deletions

diff --git a/src/main.c b/src/main.c
index 1ddbc54..16a2576 100644
--- a/src/main.c
+++ b/src/main.c
@@ -55,6 +55,7 @@
 #include <locale.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <time.h>
 #include <unistd.h>
 
 /**
@@ -121,6 +122,9 @@ int main(int argc, char *argv[]) {
 		locale_err = errno;
 	}
 
+	// Apply the environment's timezone
+	tzset();
+
 	// Parse the command line
 	struct bfs_ctx *ctx = bfs_parse_cmdline(argc, argv);
 	if (!ctx) {