Audit slstatus.c
1) Remove setlocale() (locales are harmful and any 'issues' shall be fixed in different ways that are expected). 2) Disable buffering on stdout with setbuf() rather than flushing it each time. 3) Make error messages more consistent. 4) Add error checks where applicable. 5) Make code a bit more readable where res is assigned. 6) Use XFlush() rather than XSync() (we don't need to wait for the XServer to react, which could lead to long hangs on our side).
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48
slstatus.c
48
slstatus.c
@ -1,6 +1,5 @@
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/* See LICENSE file for copyright and license details. */
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/* See LICENSE file for copyright and license details. */
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#include <errno.h>
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#include <errno.h>
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#include <locale.h>
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#include <signal.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdlib.h>
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@ -56,6 +55,7 @@ main(int argc, char *argv[])
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size_t i, len;
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size_t i, len;
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int sflag, ret;
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int sflag, ret;
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char status[MAXLEN];
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char status[MAXLEN];
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const char *res;
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sflag = 0;
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sflag = 0;
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ARGBEGIN {
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ARGBEGIN {
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@ -70,25 +70,31 @@ main(int argc, char *argv[])
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usage();
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usage();
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}
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}
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setlocale(LC_ALL, "");
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memset(&act, 0, sizeof(act));
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memset(&act, 0, sizeof(act));
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act.sa_handler = terminate;
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act.sa_handler = terminate;
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sigaction(SIGINT, &act, NULL);
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sigaction(SIGINT, &act, NULL);
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sigaction(SIGTERM, &act, NULL);
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sigaction(SIGTERM, &act, NULL);
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if (sflag) {
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setbuf(stdout, NULL);
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}
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if (!sflag && !(dpy = XOpenDisplay(NULL))) {
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if (!sflag && !(dpy = XOpenDisplay(NULL))) {
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fprintf(stderr, "Cannot open display");
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fprintf(stderr, "XOpenDisplay: Failed to open display\n");
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return 1;
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return 1;
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}
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}
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while (!done) {
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while (!done) {
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clock_gettime(CLOCK_MONOTONIC, &start);
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if (clock_gettime(CLOCK_MONOTONIC, &start) < 0) {
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fprintf(stderr, "clock_gettime: %s\n", strerror(errno));
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return 1;
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}
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status[0] = '\0';
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status[0] = '\0';
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for (i = len = 0; i < LEN(args); i++) {
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for (i = len = 0; i < LEN(args); i++) {
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const char * res = args[i].func(args[i].args);
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if (!(res = args[i].func(args[i].args))) {
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res = (res == NULL) ? unknown_str : res;
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res = unknown_str;
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}
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if ((ret = snprintf(status + len, sizeof(status) - len,
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if ((ret = snprintf(status + len, sizeof(status) - len,
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args[i].fmt, res)) < 0) {
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args[i].fmt, res)) < 0) {
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fprintf(stderr, "snprintf: %s\n",
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fprintf(stderr, "snprintf: %s\n",
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@ -103,14 +109,21 @@ main(int argc, char *argv[])
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if (sflag) {
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if (sflag) {
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printf("%s\n", status);
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printf("%s\n", status);
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fflush(stdout);
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} else {
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} else {
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XStoreName(dpy, DefaultRootWindow(dpy), status);
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if (XStoreName(dpy, DefaultRootWindow(dpy), status) < 0) {
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XSync(dpy, False);
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fprintf(stderr,
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"XStoreName: Allocation failed\n");
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return 1;
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}
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XFlush(dpy);
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}
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}
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if (!done) {
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if (!done) {
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clock_gettime(CLOCK_MONOTONIC, ¤t);
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if (clock_gettime(CLOCK_MONOTONIC, ¤t) < 0) {
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fprintf(stderr, "clock_gettime: %s\n",
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strerror(errno));
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return 1;
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}
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difftimespec(&diff, ¤t, &start);
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difftimespec(&diff, ¤t, &start);
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intspec.tv_sec = interval / 1000;
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intspec.tv_sec = interval / 1000;
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@ -118,14 +131,23 @@ main(int argc, char *argv[])
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difftimespec(&wait, &intspec, &diff);
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difftimespec(&wait, &intspec, &diff);
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if (wait.tv_sec >= 0) {
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if (wait.tv_sec >= 0) {
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nanosleep(&wait, NULL);
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if (nanosleep(&wait, NULL) < 0 &&
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errno != EINTR) {
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fprintf(stderr, "nanosleep: %s\n",
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strerror(errno));
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return 1;
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}
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}
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}
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}
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}
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}
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}
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if (!sflag) {
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if (!sflag) {
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XStoreName(dpy, DefaultRootWindow(dpy), NULL);
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XStoreName(dpy, DefaultRootWindow(dpy), NULL);
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XCloseDisplay(dpy);
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if (XCloseDisplay(dpy) < 0) {
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fprintf(stderr,
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"XCloseDisplay: Failed to close display\n");
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return 1;
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}
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}
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}
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return 0;
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return 0;
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