Save log file file descriptor for signal context logging

None of the FILE based functions are signal safe, including fileno(), so
we need to save the file descriptor for when we are in signal context.

Signed-off-by: Chase Douglas <chase.douglas@canonical.com>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>

1 files changed, 4 insertions, 0 deletions

diff --git a/os/log.c b/os/log.c
index 2c13c1a7d..5394847aa 100644
--- a/os/log.c
+++ b/os/log.c
@@ -108,6 +108,7 @@ void (*OsVendorVErrorFProc) (const char *, va_list args) = NULL;
 #endif
 
 static FILE *logFile = NULL;
+static int logFileFd = -1;
 static Bool logFlush = FALSE;
 static Bool logSync = FALSE;
 static int logVerbosity = DEFAULT_LOG_VERBOSITY;
@@ -211,6 +212,8 @@ LogInit(const char *fname, const char *backup)
             FatalError("Cannot open log file \"%s\"\n", logFileName);
         setvbuf(logFile, NULL, _IONBF, 0);
 
+        logFileFd = fileno(logFile);
+
         /* Flush saved log information. */
         if (saveBuffer && bufferSize > 0) {
             fwrite(saveBuffer, bufferPos, 1, logFile);
@@ -243,6 +246,7 @@ LogClose(enum ExitCode error)
                (error == EXIT_NO_ERROR) ? "successfully" : "with error", error);
         fclose(logFile);
         logFile = NULL;
+        logFileFd = -1;
     }
 }