diff options
Diffstat (limited to 'src/vmon.c')
| -rw-r--r-- | src/vmon.c | 30 |
1 files changed, 26 insertions, 4 deletions
@@ -66,7 +66,7 @@ typedef struct vmon_t { #define WIDTH_MIN 200 #define HEIGHT_MIN 28 -static volatile int got_sigchld, got_sigusr1, got_sigint, got_sigquit; +static volatile int got_sigchld, got_sigusr1, got_sigint, got_sigquit, got_sigterm; /* return if arg == flag or altflag if provided */ static int is_flag(const char *arg, const char *flag, const char *altflag) @@ -193,8 +193,8 @@ static void print_help(void) " -N --now-names Use current time in filenames instead of start time\n" " -o --output-dir Directory to store saved output to (\".\" if unspecified)\n" " -p --pid PID of the top-level process to monitor (1 if unspecified)\n" - " -i --snapshots Save a PNG snapshot every N seconds (SIGUSR1 also snapshots)\n" - " -s --snapshot Save a PNG snapshot upon receiving SIGCHLD\n" + " -i --snapshots Save a PNG snapshot every N seconds (SIG{TERM,USR1} also snapshots)\n" + " -s --snapshot Save a PNG snapshot upon receiving SIG{CHLD,TERM,USR1}\n" " -w --wip-name Name to use for work-in-progress snapshot filename\n" " -v --version Print version\n" " -W --width Chart width\n" @@ -223,25 +223,35 @@ static void print_copyright(void) } -/* collect status of child */ +/* collect status of child, triggering snapshot if snapshotting active */ static void handle_sigchld(int signum) { got_sigchld = 1; } +/* trigger a snapshot */ static void handle_sigusr1(int signum) { got_sigusr1 = 1; } +/* trigger a snapshot and exit immediately after it's been written */ +static void handle_sigterm(int signum) +{ + got_sigterm = 1; +} + + +/* propagates to child first time, quits second time */ static void handle_sigint(int signum) { got_sigint++; } +/* propagates to child first time, quits second time */ static void handle_sigquit(int signum) { got_sigquit++; @@ -622,6 +632,11 @@ static vmon_t * vmon_startup(int argc, const char * const *argv) goto _err_vcr; } + if (signal(SIGTERM, handle_sigterm) == SIG_ERR) { + VWM_PERROR("unable to set SIGTERM handler"); + goto _err_vcr; + } + if (vmon->snapshots_interval) { int r; @@ -855,6 +870,13 @@ int main(int argc, const char * const *argv) got_sigquit++; kill(vmon->pid, SIGQUIT); + } else if (got_sigterm) { + if (vmon->snapshot || vmon->snapshots_interval) { + /* simulate sigusr1 to trigger a final snapshot, */ + got_sigusr1 = 1; + } + + vmon->done = 1; } if (got_sigchld) { |