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/*
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,
};
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