Created
November 28, 2021 18:32
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LibXoを使用してpsコマンドの出力をJSON/XMLで行うサンプルプログラムです。
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#include <libxo/xo.h> | |
#include <stdio.h> | |
#include <stdlib.h> | |
#include <string.h> | |
int main(int argc, char *argv[]) | |
{ | |
char buf[BUFSIZ]; | |
char *c = NULL; | |
char *pid; | |
char *terminal_name; | |
char *state; | |
char *cpu_time; | |
char *command; | |
#if 0 | |
typedef struct xo_info_s { | |
const char *xi_name; /* Name of the element */ | |
const char *xi_type; /* Type of field */ | |
const char *xi_help; /* Description of field */ | |
} xo_info_t; | |
#endif | |
xo_info_t info[] = { | |
{ "pid", "number", NULL }, | |
{ "terminal-name", "string", NULL }, | |
{ "state", "string", NULL }, | |
{ "cpu-time", "string", NULL }, | |
{ "command", "string", NULL }, | |
{ NULL, NULL, NULL } | |
}; | |
int info_count = (sizeof(info) / sizeof(info[0])) - 1; | |
argc = xo_parse_args(argc, argv); | |
if (argc < 0) { | |
exit(EXIT_FAILURE); | |
} | |
xo_set_info(NULL, info, info_count); | |
xo_open_container_h(NULL, "process-information"); | |
xo_open_list("process"); | |
int count = 0; | |
FILE *io = popen("ps ax", "r"); | |
if (io) { | |
while (fgets(buf, BUFSIZ-1, io)) { | |
// "ps ax"コマンドの以下の出力をパースする。 | |
// PID TTY STAT TIME COMMAND | |
// 0 ? DKl 3:12.73 [system] | |
// 1 ? Is 0:00.02 init | |
// ... | |
if (count++ == 0) continue; // 先頭行は見出しなのでスキップする。 | |
c = strchr(buf, '\n'); // 改行を取り除く | |
if (c) *c = '\0'; | |
c = buf; // 改めて読み込んだ文字列の先頭から処理する。 | |
while (*c++ == ' '); // プロセスID | |
pid = --c; | |
c = strchr(c, ' '); *c++ = '\0'; while (*c == ' ') { c++; } | |
while (*c++ == ' '); // tty名 | |
terminal_name = --c; | |
c = strchr(c, ' '); *c++ = '\0'; while (*c == ' ') { c++; } | |
while (*c++ == ' '); // プロセスの状態 | |
state = --c; | |
c = strchr(c, ' '); *c++ = '\0'; while (*c == ' ') { c++; } | |
while (*c++ == ' '); // CPU時間 | |
cpu_time = --c; | |
c = strchr(c, ' '); *c++ = '\0'; while (*c == ' ') { c++; } | |
while (*c++ == ' '); // コマンド文字列 | |
command = --c; | |
xo_open_instance("process"); | |
xo_emit("{L:pid} '{:pid/%s}':\n", pid); | |
xo_emit("{L:terminal-name} '{:terminal-name/%s}':\n", terminal_name); | |
xo_emit("{L:state} '{:state/%s}':\n", state); | |
xo_emit("{L:cpu-time} '{:cpu-time/%s}':\n", cpu_time); | |
xo_emit("{L:command} '{:command/%s}':\n", command); | |
xo_close_instance("process"); | |
} | |
pclose(io); | |
} | |
xo_close_list("process"); | |
xo_close_container_h(NULL, "process-information"); | |
xo_finish(); | |
return 0; | |
} |
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