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[proof-of-concept] add --logfile

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Consolatis 2025-06-19 05:33:32 +02:00
parent 6117e85820
commit ac2814febb
1 changed files with 34 additions and 1 deletions
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35
src/main.c
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@ -1,5 +1,6 @@
// SPDX-License-Identifier: GPL-2.0-only
#define _POSIX_C_SOURCE 200809L
#include <fcntl.h>
#include <pango/pangocairo.h>
#include <signal.h>
#include <string.h>
@ -22,6 +23,7 @@ static const struct option long_options[] = {
{"debug", no_argument, NULL, 'd'},
{"exit", no_argument, NULL, 'e'},
{"help", no_argument, NULL, 'h'},
{"logfile", required_argument, NULL, 'l'},
{"merge-config", no_argument, NULL, 'm'},
{"reconfigure", no_argument, NULL, 'r'},
{"startup", required_argument, NULL, 's'},
@ -38,6 +40,7 @@ static const char labwc_usage[] =
" -d, --debug Enable full logging, including debug information\n"
" -e, --exit Exit the compositor\n"
" -h, --help Show help message and quit\n"
" -l, --logfile <path> Log to file instead of stderr\n"
" -m, --merge-config Merge user config files/theme in all XDG Base Dirs\n"
" -r, --reconfigure Reload the compositor configuration\n"
" -s, --startup <command> Run command on startup\n"
@ -138,6 +141,7 @@ idle_callback(void *data)
int
main(int argc, char *argv[])
{
char *logfile = NULL;
char *startup_cmd = NULL;
char *primary_client = NULL;
enum wlr_log_importance verbosity = WLR_ERROR;
@ -145,7 +149,7 @@ main(int argc, char *argv[])
int c;
while (1) {
int index = 0;
c = getopt_long(argc, argv, "c:C:dehmrs:S:vV", long_options, &index);
c = getopt_long(argc, argv, "c:C:dehl:mrs:S:vV", long_options, &index);
if (c == -1) {
break;
}
@ -162,6 +166,9 @@ main(int argc, char *argv[])
case 'e':
send_signal_to_labwc_pid(SIGTERM);
exit(0);
case 'l':
logfile = optarg;
break;
case 'm':
rc.merge_config = true;
break;
@ -189,6 +196,31 @@ main(int argc, char *argv[])
usage();
}
if (logfile) {
/*
* O_NONBLOCK is important to prevent blocking
* on write() with mandantory file locking enabled.
*/
int fd = open(logfile, O_WRONLY | O_CREAT | O_TRUNC | O_NONBLOCK, 0666);
if (fd < 0) {
perror("Failed to open logfile");
exit(1);
}
/*
* If stderr was closed before a exec labwc we could end up with 'fd' being 2.
* This is not an issue with dup2() because it turns into a no-op but we don't
* want to close it in that case.
*/
if (fd != STDERR_FILENO) {
if (dup2(fd, STDERR_FILENO) < 0) {
perror("Failed to replace stderr with log file descriptor");
close(fd);
exit(1);
}
close(fd);
}
}
wlr_log_init(verbosity, NULL);
die_on_detecting_suid();
@ -262,5 +294,6 @@ main(int argc, char *argv[])
server_finish(&server);
close(STDERR_FILENO);
return 0;
}