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/*
htop - TraceScreen.c
(C) 2005-2006 Hisham H. Muhammad
Released under the GNU GPL, see the COPYING file
in the source distribution for its full text.
*/
#include "TraceScreen.h"
#include "CRT.h"
#include "InfoScreen.h"
#include "ProcessList.h"
#include "ListItem.h"
#include "IncSet.h"
#include "StringUtils.h"
#include "FunctionBar.h"
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <stdbool.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <signal.h>
/*{
#include "InfoScreen.h"
typedef struct TraceScreen_ {
InfoScreen super;
bool tracing;
int fdpair[2];
int child;
FILE* strace;
int fd_strace;
bool contLine;
bool follow;
} TraceScreen;
}*/
static const char* const TraceScreenFunctions[] = {"Search ", "Filter ", "AutoScroll ", "Stop Tracing ", "Done ", NULL};
static const char* const TraceScreenKeys[] = {"F3", "F4", "F8", "F9", "Esc"};
static int TraceScreenEvents[] = {KEY_F(3), KEY_F(4), KEY_F(8), KEY_F(9), 27};
InfoScreenClass TraceScreen_class = {
.super = {
.extends = Class(Object),
.delete = TraceScreen_delete
},
.draw = TraceScreen_draw,
.onErr = TraceScreen_updateTrace,
.onKey = TraceScreen_onKey,
};
TraceScreen* TraceScreen_new(Process* process) {
TraceScreen* this = xMalloc(sizeof(TraceScreen));
Object_setClass(this, Class(TraceScreen));
this->tracing = true;
this->contLine = false;
this->follow = false;
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);
waitpid(this->child, NULL, 0);
fclose(this->strace);
}
CRT_enableDelay();
free(InfoScreen_done((InfoScreen*)cast));
}
void TraceScreen_draw(InfoScreen* this) {
attrset(CRT_colors[PANEL_HEADER_FOCUS]);
mvhline(0, 0, ' ', COLS);
mvprintw(0, 0, "Trace of process %d - %s", this->process->pid, this->process->comm);
attrset(CRT_colors[DEFAULT_COLOR]);
IncSet_drawBar(this->inc);
}
bool TraceScreen_forkTracer(TraceScreen* this) {
char buffer[1001];
int error = pipe(this->fdpair);
if (error == -1) return false;
this->child = fork();
if (this->child == -1) return false;
if (this->child == 0) {
CRT_dropPrivileges();
dup2(this->fdpair[1], STDERR_FILENO);
int ok = fcntl(this->fdpair[1], F_SETFL, O_NONBLOCK);
if (ok != -1) {
xSnprintf(buffer, sizeof(buffer), "%d", this->super.process->pid);
execlp("strace", "strace", "-p", buffer, NULL);
}
const char* message = "Could not execute 'strace'. Please make sure it is available in your $PATH.";
ssize_t written = write(this->fdpair[1], message, strlen(message));
(void) written;
exit(1);
}
fcntl(this->fdpair[0], F_SETFL, O_NONBLOCK);
this->strace = fdopen(this->fdpair[0], "r");
this->fd_strace = fileno(this->strace);
return true;
}
void TraceScreen_updateTrace(InfoScreen* super) {
TraceScreen* this = (TraceScreen*) super;
char buffer[1001];
fd_set fds;
FD_ZERO(&fds);
// FD_SET(STDIN_FILENO, &fds);
FD_SET(this->fd_strace, &fds);
struct timeval tv;
tv.tv_sec = 0; tv.tv_usec = 500;
int ready = select(this->fd_strace+1, &fds, NULL, NULL, &tv);
int nread = 0;
if (ready > 0 && FD_ISSET(this->fd_strace, &fds))
nread = fread(buffer, 1, 1000, this->strace);
if (nread && this->tracing) {
char* line = buffer;
buffer[nread] = '\0';
for (int 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);
}
}
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;
}
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