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authorAlan Coopersmith <alan.coopersmith@oracle.com>2017-03-15 15:42:10 +0000
committerMike Gabriel <mike.gabriel@das-netzwerkteam.de>2017-03-21 10:58:08 +0100
commite96e810c2287232000767ee55f2d1b84b31e6291 (patch)
tree178d1a898cb3bd6f966d9add2231912145e23909 /nx-X11/programs/Xserver/os/log.c
parentfaaba2661306288bb25d9a5a5b81ef80fa6b851f (diff)
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Use unique logfile names when starting server with -displayfd
commit edcb6426f20c3be5dd5f50b76a686754aef2f64e Author: Alan Coopersmith <alan.coopersmith@oracle.com> Date: Fri Jan 1 18:11:14 2016 -0800 Use unique logfile names when starting server with -displayfd Fixes https://bugs.freedesktop.org/show_bug.cgi?id=93212 Previously all X servers started with -displayfd would overwrite Xorg.0.log - now a temporary name of Xorg.pid-<pid>.log is used until after -displayfd finds an open display - then it is renamed to the traditional Xorg.<display>.log name. Reviewed-by: Adam Jackson <ajax@redhat.com> Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com> Backported-to-NX-by: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>
Diffstat (limited to 'nx-X11/programs/Xserver/os/log.c')
-rw-r--r--nx-X11/programs/Xserver/os/log.c127
1 files changed, 98 insertions, 29 deletions
diff --git a/nx-X11/programs/Xserver/os/log.c b/nx-X11/programs/Xserver/os/log.c
index d82f545a0..0ead6e9f0 100644
--- a/nx-X11/programs/Xserver/os/log.c
+++ b/nx-X11/programs/Xserver/os/log.c
@@ -179,48 +179,87 @@ static Bool needBuffer = TRUE;
#endif
/*
+ * LogFilePrep is called to setup files for logging, including getting
+ * an old file out of the way, but it doesn't actually open the file,
+ * since it may be used for renaming a file we're already logging to.
+ */
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wformat-nonliteral"
+
+static char *
+LogFilePrep(const char *fname, const char *backup, const char *idstring)
+{
+ char *logFileName = NULL;
+
+ if (asprintf(&logFileName, fname, idstring) == -1)
+ FatalError("Cannot allocate space for the log file name\n");
+
+ if (backup && *backup) {
+ struct stat buf;
+
+ if (!stat(logFileName, &buf) && S_ISREG(buf.st_mode)) {
+ char *suffix;
+ char *oldLog;
+
+ if ((asprintf(&suffix, backup, idstring) == -1) ||
+ (asprintf(&oldLog, "%s%s", logFileName, suffix) == -1)) {
+ FatalError("Cannot allocate space for the log file name\n");
+ }
+ free(suffix);
+
+ if (rename(logFileName, oldLog) == -1) {
+ FatalError("Cannot move old log file \"%s\" to \"%s\"\n",
+ logFileName, oldLog);
+ }
+ free(oldLog);
+ }
+ }
+ else {
+ if (remove(logFileName) != 0) {
+ FatalError("Cannot remove old log file \"%s\": %s\n",
+ logFileName, strerror(errno));
+ }
+ }
+
+ return logFileName;
+}
+#pragma GCC diagnostic pop
+
+/*
* LogInit is called to start logging to a file. It is also called (with
* NULL arguments) when logging to a file is not wanted. It must always be
* called, otherwise log messages will continue to accumulate in a buffer.
*
* %s, if present in the fname or backup strings, is expanded to the display
- * string.
+ * string (or to a string containing the pid if the display is not yet set).
*/
+static char *saved_log_fname;
+static char *saved_log_backup;
+static char *saved_log_tempname;
+
const char *
LogInit(const char *fname, const char *backup)
{
char *logFileName = NULL;
if (fname && *fname) {
- /* malloc() can't be used yet. */
- logFileName = malloc(strlen(fname) + strlen(display) + 1);
- if (!logFileName)
- FatalError("Cannot allocate space for the log file name\n");
- sprintf(logFileName, fname, display);
-
- if (backup && *backup) {
- struct stat buf;
-
- if (!stat(logFileName, &buf) && S_ISREG(buf.st_mode)) {
- char *suffix;
- char *oldLog;
-
- oldLog = malloc(strlen(logFileName) + strlen(backup) +
- strlen(display) + 1);
- suffix = malloc(strlen(backup) + strlen(display) + 1);
- if (!oldLog || !suffix)
- FatalError("Cannot allocate space for the log file name\n");
- sprintf(suffix, backup, display);
- sprintf(oldLog, "%s%s", logFileName, suffix);
- free(suffix);
- if (rename(logFileName, oldLog) == -1) {
- FatalError("Cannot move old log file (\"%s\" to \"%s\"\n",
- logFileName, oldLog);
- }
- free(oldLog);
- }
- }
+ if (displayfd != -1) {
+ /* Display isn't set yet, so we can't use it in filenames yet. */
+ char pidstring[32];
+ snprintf(pidstring, sizeof(pidstring), "pid-%ld",
+ (unsigned long) getpid());
+ logFileName = LogFilePrep(fname, backup, pidstring);
+ saved_log_tempname = logFileName;
+
+ /* Save the patterns for use when the display is named. */
+ saved_log_fname = strdup(fname);
+ if (backup == NULL)
+ saved_log_backup = NULL;
+ else
+ saved_log_backup = strdup(backup);
+ } else
+ logFileName = LogFilePrep(fname, backup, display);
if ((logFile = fopen(logFileName, "w")) == NULL)
FatalError("Cannot open log file \"%s\"\n", logFileName);
setvbuf(logFile, NULL, _IONBF, 0);
@@ -250,6 +289,36 @@ LogInit(const char *fname, const char *backup)
}
void
+LogSetDisplay(void)
+{
+ if (saved_log_fname) {
+ char *logFileName;
+
+ logFileName = LogFilePrep(saved_log_fname, saved_log_backup, display);
+
+ if (rename(saved_log_tempname, logFileName) == 0) {
+ LogMessageVerb(X_PROBED, 0,
+ "Log file renamed from \"%s\" to \"%s\"\n",
+ saved_log_tempname, logFileName);
+
+ if (strlen(saved_log_tempname) >= strlen(logFileName))
+ strncpy(saved_log_tempname, logFileName,
+ strlen(saved_log_tempname));
+ }
+ else {
+ ErrorF("Failed to rename log file \"%s\" to \"%s\": %s\n",
+ saved_log_tempname, logFileName, strerror(errno));
+ }
+
+ /* free newly allocated string - can't free old one since existing
+ pointers to it may exist in DDX callers. */
+ free(logFileName);
+ free(saved_log_fname);
+ free(saved_log_backup);
+ }
+}
+
+void
LogClose()
{
if (logFile) {