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-rw-r--r--TraceScreen.c193
1 files changed, 193 insertions, 0 deletions
diff --git a/TraceScreen.c b/TraceScreen.c
new file mode 100644
index 0000000..2aa0781
--- /dev/null
+++ b/TraceScreen.c
@@ -0,0 +1,193 @@
+/*
+htop - TraceScreen.c
+(C) 2005-2006 Hisham H. Muhammad
+Released under the GNU GPLv2+, see the COPYING file
+in the source distribution for its full text.
+*/
+
+#include "config.h" // IWYU pragma: keep
+
+#include "TraceScreen.h"
+
+#include <assert.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <signal.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/select.h>
+#include <sys/wait.h>
+
+#include "CRT.h"
+#include "FunctionBar.h"
+#include "Panel.h"
+#include "ProvideCurses.h"
+#include "XUtils.h"
+
+
+static const char* const TraceScreenFunctions[] = {"Search ", "Filter ", "AutoScroll ", "Stop Tracing ", "Done ", NULL};
+
+static const char* const TraceScreenKeys[] = {"F3", "F4", "F8", "F9", "Esc"};
+
+static const int TraceScreenEvents[] = {KEY_F(3), KEY_F(4), KEY_F(8), KEY_F(9), 27};
+
+TraceScreen* TraceScreen_new(const Process* process) {
+ // This initializes all TraceScreen variables to "false" so only default = true ones need to be set below
+ TraceScreen* this = xCalloc(1, sizeof(TraceScreen));
+ Object_setClass(this, Class(TraceScreen));
+ this->tracing = true;
+ FunctionBar* fuBar = FunctionBar_new(TraceScreenFunctions, TraceScreenKeys, TraceScreenEvents);
+ CRT_disableDelay();
+ return (TraceScreen*) InfoScreen_init(&this->super, process, fuBar, LINES - 2, " ");
+}
+
+void TraceScreen_delete(Object* cast) {
+ TraceScreen* this = (TraceScreen*) cast;
+ if (this->child > 0) {
+ kill(this->child, SIGTERM);
+ while (waitpid(this->child, NULL, 0) == -1)
+ if (errno != EINTR)
+ break;
+ }
+
+ if (this->strace) {
+ fclose(this->strace);
+ }
+
+ CRT_enableDelay();
+ free(InfoScreen_done((InfoScreen*)this));
+}
+
+static void TraceScreen_draw(InfoScreen* this) {
+ InfoScreen_drawTitled(this, "Trace of process %d - %s", this->process->pid, Process_getCommand(this->process));
+}
+
+bool TraceScreen_forkTracer(TraceScreen* this) {
+ int fdpair[2] = {0, 0};
+
+ if (pipe(fdpair) == -1)
+ return false;
+
+ if (fcntl(fdpair[0], F_SETFL, O_NONBLOCK) < 0)
+ goto err;
+
+ if (fcntl(fdpair[1], F_SETFL, O_NONBLOCK) < 0)
+ goto err;
+
+ pid_t child = fork();
+ if (child == -1)
+ goto err;
+
+ if (child == 0) {
+ close(fdpair[0]);
+
+ dup2(fdpair[1], STDOUT_FILENO);
+ dup2(fdpair[1], STDERR_FILENO);
+ close(fdpair[1]);
+
+ char buffer[32] = {0};
+ xSnprintf(buffer, sizeof(buffer), "%d", this->super.process->pid);
+ // Use of NULL in variadic functions must have a pointer cast.
+ // The NULL constant is not required by standard to have a pointer type.
+ execlp("strace", "strace", "-T", "-tt", "-s", "512", "-p", buffer, (char *)NULL);
+
+ // Should never reach here, unless execlp fails ...
+ const char* message = "Could not execute 'strace'. Please make sure it is available in your $PATH.";
+ (void)! write(STDERR_FILENO, message, strlen(message));
+
+ exit(127);
+ }
+
+ FILE* fd = fdopen(fdpair[0], "r");
+ if (!fd)
+ goto err;
+
+ close(fdpair[1]);
+
+ this->child = child;
+ this->strace = fd;
+ return true;
+
+err:
+ close(fdpair[1]);
+ close(fdpair[0]);
+ return false;
+}
+
+static void TraceScreen_updateTrace(InfoScreen* super) {
+ TraceScreen* this = (TraceScreen*) super;
+ char buffer[1025];
+
+ int fd_strace = fileno(this->strace);
+ assert(fd_strace != -1);
+
+ fd_set fds;
+ FD_ZERO(&fds);
+// FD_SET(STDIN_FILENO, &fds);
+ FD_SET(fd_strace, &fds);
+
+ struct timeval tv = { .tv_sec = 0, .tv_usec = 500 };
+ int ready = select(fd_strace + 1, &fds, NULL, NULL, &tv);
+
+ size_t nread = 0;
+ if (ready > 0 && FD_ISSET(fd_strace, &fds))
+ nread = fread(buffer, 1, sizeof(buffer) - 1, this->strace);
+
+ if (nread && this->tracing) {
+ const char* line = buffer;
+ buffer[nread] = '\0';
+ for (size_t i = 0; i < nread; i++) {
+ if (buffer[i] == '\n') {
+ buffer[i] = '\0';
+ if (this->contLine) {
+ InfoScreen_appendLine(&this->super, line);
+ this->contLine = false;
+ } else {
+ InfoScreen_addLine(&this->super, line);
+ }
+ line = buffer + i + 1;
+ }
+ }
+ if (line < buffer + nread) {
+ InfoScreen_addLine(&this->super, line);
+ buffer[nread] = '\0';
+ this->contLine = true;
+ }
+ if (this->follow) {
+ Panel_setSelected(this->super.display, Panel_size(this->super.display) - 1);
+ }
+ }
+}
+
+static bool TraceScreen_onKey(InfoScreen* super, int ch) {
+ TraceScreen* this = (TraceScreen*) super;
+ switch (ch) {
+ case 'f':
+ case KEY_F(8):
+ this->follow = !(this->follow);
+ if (this->follow)
+ Panel_setSelected(super->display, Panel_size(super->display) - 1);
+ return true;
+ case 't':
+ case KEY_F(9):
+ this->tracing = !this->tracing;
+ FunctionBar_setLabel(super->display->defaultBar, KEY_F(9), this->tracing ? "Stop Tracing " : "Resume Tracing ");
+ InfoScreen_draw(this);
+ return true;
+ }
+ this->follow = false;
+ return false;
+}
+
+const InfoScreenClass TraceScreen_class = {
+ .super = {
+ .extends = Class(Object),
+ .delete = TraceScreen_delete
+ },
+ .draw = TraceScreen_draw,
+ .onErr = TraceScreen_updateTrace,
+ .onKey = TraceScreen_onKey,
+};