{"id":3396,"date":"2017-07-14T21:46:54","date_gmt":"2017-07-14T13:46:54","guid":{"rendered":"https:\/\/ixyzero.com\/blog\/?p=3396"},"modified":"2017-07-14T22:18:36","modified_gmt":"2017-07-14T14:18:36","slug":"linux%e4%b8%8b%e7%9a%84c%e8%af%ad%e8%a8%80getline%e5%92%8cgetdelim","status":"publish","type":"post","link":"https:\/\/ixyzero.com\/blog\/archives\/3396.html","title":{"rendered":"Linux\u4e0b\u7684C\u8bed\u8a00#getline\u548cgetdelim"},"content":{"rendered":"

=Start=<\/p>\n

\u7f18\u7531\uff1a<\/h4>\n

\u6574\u7406\u5b66\u4e60\u5728\u8fdb\u884cLinux\u4e0bC\u7f16\u7a0b\u4e2d\u78b0\u5230\u7684\u4e00\u4e9b\u77e5\u8bc6\u70b9\uff0c\u65b9\u4fbf\u4ee5\u540e\u8fdb\u884c\u53c2\u8003\u3002<\/p>\n

\u6b63\u6587\uff1a<\/h4>\n

\u53c2\u8003\u89e3\u7b54\uff1a<\/h5>\n
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#include <stdio.h><\/code><\/div>\n
#include <stdlib.h><\/code><\/div>\n
#include <string.h><\/code><\/div>\n
<\/div>\n
int<\/code>\u00a0main(<\/code>int<\/code>\u00a0argc,\u00a0<\/code>char<\/code>\u00a0*argv[])<\/code><\/div>\n
{<\/code><\/div>\n
\u00a0\u00a0\u00a0<\/code>FILE *stream;<\/code><\/div>\n
\u00a0\u00a0\u00a0<\/code>char<\/code>\u00a0*line = NULL;<\/code><\/div>\n
\u00a0\u00a0\u00a0<\/code>size_t len =\u00a0<\/code>0<\/code>;<\/code><\/div>\n
\u00a0\u00a0\u00a0<\/code>ssize_t nread;<\/code><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0<\/code>if<\/code>\u00a0(argc !=\u00a0<\/code>2<\/code>) {<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>fprintf(stderr,\u00a0<\/code>\"Usage: %s <file>\\n\"<\/code>, argv[<\/code>1<\/code>]);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>exit(EXIT_FAILURE);<\/code><\/div>\n
\u00a0\u00a0\u00a0<\/code>}<\/code><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0<\/code>stream = fopen(argv[<\/code>1<\/code>],\u00a0<\/code>\"r\"<\/code>);<\/code><\/div>\n
\u00a0\u00a0\u00a0<\/code>if<\/code>\u00a0(stream == NULL) {<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>perror(<\/code>\"fopen\"<\/code>);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>exit(EXIT_FAILURE);<\/code><\/div>\n
\u00a0\u00a0\u00a0<\/code>}<\/code><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0<\/code>while<\/code>\u00a0((nread = getline(&line, &len, stream)) != -<\/code>1<\/code>) {<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>printf(<\/code>\"Retrieved line of length %zu:\\n\"<\/code>, nread);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>\/\/ fwrite(line, nread, 1, stdout);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>printf(<\/code>\"strlen(line) = %d\\n\"<\/code>, strlen(line));<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>printf(<\/code>\"sizeof(line) = %d\\n\"<\/code>, sizeof(line));<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>printf(<\/code>\"%s\\n\"<\/code>, line);<\/code><\/div>\n
\u00a0\u00a0\u00a0<\/code>}<\/code><\/div>\n
\u00a0\u00a0\u00a0<\/code>printf(<\/code>\"strlen(line) = %d\\n\"<\/code>, strlen(line));<\/code><\/div>\n
\u00a0\u00a0\u00a0<\/code>printf(<\/code>\"sizeof(line) = %d\\n\"<\/code>, sizeof(line));<\/code><\/div>\n
\u00a0\u00a0\u00a0<\/code>printf(<\/code>\"%s\\n\"<\/code>, line);<\/code><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0<\/code>free(line);<\/code><\/div>\n
\u00a0\u00a0\u00a0<\/code>fclose(stream);<\/code><\/div>\n
\u00a0\u00a0\u00a0<\/code>exit(EXIT_SUCCESS);<\/code><\/div>\n
}<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

&<\/p>\n

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#include <stdio.h><\/code><\/div>\n
#include <stdlib.h><\/code><\/div>\n
<\/div>\n
int<\/code>\u00a0main(<\/code>int<\/code>\u00a0argc,\u00a0<\/code>char<\/code>\u00a0**argv)<\/code><\/div>\n
{<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>FILE *cmdline = fopen(<\/code>\"\/proc\/self\/cmdline\"<\/code>,\u00a0<\/code>\"rb\"<\/code>);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>char<\/code>\u00a0*arg =\u00a0<\/code>0<\/code>;<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>size_t size =\u00a0<\/code>0<\/code>;<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>while<\/code>(getdelim(&arg, &size,\u00a0<\/code>0<\/code>, cmdline) != -<\/code>1<\/code>)<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>{<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>puts(arg);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>}<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>free(arg);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>fclose(cmdline);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>return<\/code>\u00a00<\/code>;<\/code><\/div>\n
}<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

&<\/p>\n

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void<\/code>\u00a0read_proc(<\/code>int<\/code>\u00a0process_pid) {<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>char<\/code>\u00a0cmdline[<\/code>1024<\/code>], fname1[<\/code>1024<\/code>], ids[<\/code>1024<\/code>], fname2[<\/code>1024<\/code>], buf[<\/code>1024<\/code>];<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>int<\/code>\u00a0r =\u00a0<\/code>0<\/code>, fd, i;<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>FILE *f = NULL;<\/code><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>snprintf(fname1, sizeof(fname1),\u00a0<\/code>\"\/proc\/%d\/status\"<\/code>, process_pid);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>f = fopen(fname1,\u00a0<\/code>\"r\"<\/code>);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>memset(&ids,\u00a0<\/code>0<\/code>, sizeof(ids));<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>while<\/code>\u00a0(f && fgets(buf, sizeof(buf), f) != NULL) {<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>if<\/code>\u00a0(strstr(buf,\u00a0<\/code>\"Uid\"<\/code>)) {<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>strtok(buf,\u00a0<\/code>\"\\n\"<\/code>);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>snprintf(ids, sizeof(ids),\u00a0<\/code>\"%s\"<\/code>, buf);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>}<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>}<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>if<\/code>\u00a0(f)<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>fclose(f);<\/code><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>snprintf(fname2, sizeof(fname2),\u00a0<\/code>\"\/proc\/%d\/cmdline\"<\/code>, process_pid);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>fd = open(fname2, O_RDONLY);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>memset(&cmdline,\u00a0<\/code>0<\/code>, sizeof(cmdline));<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>if<\/code>\u00a0(fd >\u00a0<\/code>0<\/code>) {<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>r = read(fd, cmdline, sizeof(cmdline));<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>close(fd);<\/code><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>for<\/code>\u00a0(i =\u00a0<\/code>0<\/code>; r >\u00a0<\/code>0<\/code>\u00a0&& i < r-<\/code>1<\/code>; ++i) {<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>if<\/code>\u00a0(cmdline[i] ==\u00a0<\/code>0<\/code>)<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>cmdline[i] =\u00a0<\/code>' '<\/code>;<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>}<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>}<\/code><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>printf(<\/code>\"EXEC:pid=%d\\t[%s]\\t[%s]\\n\"<\/code>, process_pid, ids, cmdline);<\/code><\/div>\n
}<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
\u53c2\u8003\u94fe\u63a5\uff1a<\/h5>\n