htop/OpenFilesScreen.c

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/*
htop - OpenFilesScreen.c
(C) 2005-2006 Hisham H. Muhammad
Released under the GNU GPLv2+, see the COPYING file
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in the source distribution for its full text.
*/
#include "config.h" // IWYU pragma: keep
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#include "OpenFilesScreen.h"
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#include <fcntl.h>
#include <inttypes.h>
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#include <stdio.h>
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#include <stdlib.h>
#include <string.h>
#include <unistd.h>
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#include <sys/types.h>
#include <sys/wait.h>
#include <sys/stat.h>
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#include "Macros.h"
#include "Panel.h"
#include "ProvideCurses.h"
#include "Vector.h"
#include "XUtils.h"
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typedef struct OpenFiles_Data_ {
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char* data[8];
} OpenFiles_Data;
typedef struct OpenFiles_ProcessData_ {
OpenFiles_Data data;
int error;
struct OpenFiles_FileData_* files;
} OpenFiles_ProcessData;
typedef struct OpenFiles_FileData_ {
OpenFiles_Data data;
struct OpenFiles_FileData_* next;
} OpenFiles_FileData;
static size_t getIndexForType(char type) {
switch (type) {
case 'f':
return 0;
case 'a':
return 1;
case 'D':
return 2;
case 'i':
return 3;
case 'n':
return 4;
case 's':
return 5;
case 't':
return 6;
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case 'o':
return 7;
}
/* should never reach here */
abort();
}
static const char* getDataForType(const OpenFiles_Data* data, char type) {
size_t index = getIndexForType(type);
return data->data[index] ? data->data[index] : "";
}
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OpenFilesScreen* OpenFilesScreen_new(const Process* process) {
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OpenFilesScreen* this = xMalloc(sizeof(OpenFilesScreen));
Object_setClass(this, Class(OpenFilesScreen));
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if (Process_isThread(process)) {
this->pid = process->tgid;
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} else {
this->pid = process->pid;
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}
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return (OpenFilesScreen*) InfoScreen_init(&this->super, process, NULL, LINES - 2, " FD TYPE MODE DEVICE SIZE OFFSET NODE NAME");
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}
void OpenFilesScreen_delete(Object* this) {
free(InfoScreen_done((InfoScreen*)this));
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}
static void OpenFilesScreen_draw(InfoScreen* this) {
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InfoScreen_drawTitled(this, "Snapshot of files open in process %d - %s", ((OpenFilesScreen*)this)->pid, Process_getCommand(this->process));
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}
static OpenFiles_ProcessData* OpenFilesScreen_getProcessData(pid_t pid) {
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OpenFiles_ProcessData* pdata = xCalloc(1, sizeof(OpenFiles_ProcessData));
int fdpair[2] = {0, 0};
if (pipe(fdpair) == -1) {
pdata->error = 1;
return pdata;
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}
pid_t child = fork();
if (child == -1) {
close(fdpair[1]);
close(fdpair[0]);
pdata->error = 1;
return pdata;
}
if (child == 0) {
close(fdpair[0]);
dup2(fdpair[1], STDOUT_FILENO);
close(fdpair[1]);
int fdnull = open("/dev/null", O_WRONLY);
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if (fdnull < 0) {
exit(1);
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}
dup2(fdnull, STDERR_FILENO);
close(fdnull);
char buffer[32] = {0};
xSnprintf(buffer, sizeof(buffer), "%d", pid);
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execlp("lsof", "lsof", "-P", "-o", "-p", buffer, "-F", NULL);
exit(127);
}
close(fdpair[1]);
OpenFiles_Data* item = &(pdata->data);
OpenFiles_FileData* fdata = NULL;
bool lsofIncludesFileSize = false;
FILE* fd = fdopen(fdpair[0], "r");
if (!fd) {
pdata->error = 1;
return pdata;
}
for (;;) {
char* line = String_readLine(fd);
if (!line) {
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break;
}
unsigned char cmd = line[0];
switch (cmd) {
case 'f': /* file descriptor */
{
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OpenFiles_FileData* nextFile = xCalloc(1, sizeof(OpenFiles_FileData));
if (fdata == NULL) {
pdata->files = nextFile;
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} else {
fdata->next = nextFile;
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}
fdata = nextFile;
item = &(fdata->data);
} /* FALLTHRU */
case 'a': /* file access mode */
case 'D': /* file's major/minor device number */
case 'i': /* file's inode number */
case 'n': /* file name, comment, Internet address */
case 's': /* file's size */
case 't': /* file's type */
{
size_t index = getIndexForType(cmd);
free_and_xStrdup(&item->data[index], line + 1);
break;
}
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case 'o': /* file's offset */
{
size_t index = getIndexForType(cmd);
if (String_startsWith(line + 1, "0t")) {
free_and_xStrdup(&item->data[index], line + 3);
} else {
free_and_xStrdup(&item->data[index], line + 1);
}
break;
}
case 'c': /* process command name */
case 'd': /* file's device character code */
case 'g': /* process group ID */
case 'G': /* file flags */
case 'k': /* link count */
case 'l': /* file's lock status */
case 'L': /* process login name */
case 'p': /* process ID */
case 'P': /* protocol name */
case 'R': /* parent process ID */
case 'T': /* TCP/TPI information, identified by prefixes */
case 'u': /* process user ID */
/* ignore */
break;
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}
if (cmd == 's')
lsofIncludesFileSize = true;
free(line);
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}
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fclose(fd);
int wstatus;
if (waitpid(child, &wstatus, 0) == -1) {
pdata->error = 1;
return pdata;
}
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if (!WIFEXITED(wstatus)) {
pdata->error = 1;
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} else {
pdata->error = WEXITSTATUS(wstatus);
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}
/* We got all information we need; no post-processing needed */
if (lsofIncludesFileSize)
return pdata;
/* On linux, `lsof -o -F` omits SIZE, so add it back. */
/* On macOS, `lsof -o -F` includes SIZE, so this block isn't needed. If no open files have a filesize, this will still run, unfortunately. */
size_t fileSizeIndex = getIndexForType('s');
for (fdata = pdata->files; fdata != NULL; fdata = fdata->next) {
item = &fdata->data;
const char* filename = getDataForType(item, 'n');
struct stat st;
if (stat(filename, &st) == 0) {
char fileSizeBuf[21]; /* 20 (long long) + 1 (NULL) */
xSnprintf(fileSizeBuf, sizeof(fileSizeBuf), "%"PRIu64, st.st_size); /* st.st_size is long long on macOS, long on linux */
free_and_xStrdup(&item->data[fileSizeIndex], fileSizeBuf);
}
}
return pdata;
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}
static void OpenFiles_Data_clear(OpenFiles_Data* data) {
for (size_t i = 0; i < ARRAYSIZE(data->data); i++)
free(data->data[i]);
}
static void OpenFilesScreen_scan(InfoScreen* this) {
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Panel* panel = this->display;
int idx = Panel_getSelectedIndex(panel);
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Panel_prune(panel);
OpenFiles_ProcessData* pdata = OpenFilesScreen_getProcessData(((OpenFilesScreen*)this)->pid);
if (pdata->error == 127) {
InfoScreen_addLine(this, "Could not execute 'lsof'. Please make sure it is available in your $PATH.");
} else if (pdata->error == 1) {
InfoScreen_addLine(this, "Failed listing open files.");
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} else {
OpenFiles_FileData* fdata = pdata->files;
while (fdata) {
OpenFiles_Data* data = &fdata->data;
size_t lenN = strlen(getDataForType(data, 'n'));
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size_t sizeEntry = 5 + 7 + 4 + 10 + 10 + 10 + 10 + lenN + 8 /*spaces*/ + 1 /*null*/;
char entry[sizeEntry];
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xSnprintf(entry, sizeof(entry), "%5.5s %-7.7s %-4.4s %-10.10s %10.10s %10.10s %10.10s %s",
getDataForType(data, 'f'),
getDataForType(data, 't'),
getDataForType(data, 'a'),
getDataForType(data, 'D'),
getDataForType(data, 's'),
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getDataForType(data, 'o'),
getDataForType(data, 'i'),
getDataForType(data, 'n'));
InfoScreen_addLine(this, entry);
OpenFiles_Data_clear(data);
OpenFiles_FileData* old = fdata;
fdata = fdata->next;
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free(old);
}
OpenFiles_Data_clear(&pdata->data);
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}
free(pdata);
Vector_insertionSort(this->lines);
Vector_insertionSort(panel->items);
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Panel_setSelected(panel, idx);
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}
const InfoScreenClass OpenFilesScreen_class = {
.super = {
.extends = Class(Object),
.delete = OpenFilesScreen_delete
},
.scan = OpenFilesScreen_scan,
.draw = OpenFilesScreen_draw
};