Added option to print to standard output

kernc · Aug 12, 2016 · 02b32202e6aa18009a9f214117bb639a8793b490 · 02b3220
1 parent f6a1de2
commit 02b32202e6aa18009a9f214117bb639a8793b490
Unified Split

Showing with 20 additions and 3 deletions.

+2 −0 man/logkeys.8

+17 −2 src/logkeys.cc

+1 −1 src/usage.cc
diff --git a/man/logkeys.8 b/man/logkeys.8
@@ -49,6 +49,8 @@ Set ouput log file to \fIlogfile\fR. If no \fB-o\fR option is provided, logkeys
 appends to \fI/var/log/logkeys.log\fR file. If \fIlogfile\fR doesn't exist, logkeys
 creates the file with 600 permissions.
 .IP
+  
+To print output to standard output, use '-' as logfile: \fB-o\fR \fI-\fR.
+  
+.IP
 See also \fBLOGFILE FORMAT\fR section.
 .TP

diff --git a/src/logkeys.cc b/src/logkeys.cc
@@ -393,6 +393,11 @@ int main(int argc, char **argv)
  if (!args.keymap.empty() && (!(args.flags & FLAG_EXPORT_KEYMAP) && args.us_keymap)) {  // exporting uses args.keymap also
    error(EXIT_FAILURE, 0, "Incompatible flags '-m' and '-u'. See usage.");
  }
+  
+
+  
+  // check for incompatible flags: if posting remote and output is set to stdout
+  
+  if (args.post_size != 0 && ( args.logfile == "-" )) {
+  
+    error(EXIT_FAILURE, 0, "Incompatible flags [--post-size | --post-http] and --output to stdout");
+  
+  }
  set_utf8_locale();
@@ -423,7 +428,11 @@ int main(int argc, char **argv)
  int noclose = 1;  // don't close streams (stderr used)
  if (daemon(nochdir, noclose) == -1)  // become daemon
    error(EXIT_FAILURE, errno, "Failed to become daemon");
-  
-  close(STDIN_FILENO); close(STDOUT_FILENO);  // leave stderr open
+  
+  close(STDIN_FILENO);
+  
+  // leave stderr open
+  
+  if (args.logfile != "-") {
+  
+    close(STDOUT_FILENO);
+  
+  }
  // open input device for reading
  input_fd = open(args.device.c_str(), O_RDONLY);
@@ -439,7 +448,13 @@ int main(int argc, char **argv)
  // open log file (if file doesn't exist, create it with safe 0600 permissions)
  umask(0177);
-  
-  FILE *out = fopen(args.logfile.c_str(), "a");
+  
+  FILE *out = NULL;
+  
+  if (args.logfile == "-") {
+  
+    out = stdout;
+  
+  }
+  
+  else {
+  
+    out = fopen(args.logfile.c_str(), "a");
+  
+  }
  if (!out)
    error(EXIT_FAILURE, errno, "Error opening output file '%s'", args.logfile.c_str());

diff --git a/src/usage.cc b/src/usage.cc
@@ -19,7 +19,7 @@ void usage()
 "\n"
 "  -s, --start               start logging keypresses\n"
 "  -m, --keymap=FILE         use keymap FILE\n"
-  
-"  -o, --output=FILE         log output to FILE [" DEFAULT_LOG_FILE "]\n"
+  
+"  -o, --output=FILE         log output to FILE [" DEFAULT_LOG_FILE "] or standard output '-'\n"
 "  -u, --us-keymap           use en_US keymap instead of configured default\n"
 "  -k, --kill                kill running logkeys process\n"
 "  -d, --device=FILE         input event device [eventX from " INPUT_EVENT_PATH "]\n"