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