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#include <config.h>
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#include <glibtop.h>
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#include <glibtop/error.h>
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#include "glibtop_private.h"
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#include <glib.h>
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#include <string.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <fcntl.h>
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#include <unistd.h>
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unsigned long long
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get_scaled(const char *buffer, const char *key)
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{
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const char *ptr = buffer;
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char *next;
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unsigned long long value;
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if (key) {
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if (G_LIKELY((ptr = strstr(buffer, key))))
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ptr += strlen(key);
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else {
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g_warning("Could not read key '%s' in buffer '%s'",
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key, buffer);
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return 0;
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}
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}
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value = strtoull(ptr, &next, 0);
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for ( ; *next; ++next) {
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if (*next == 'k') {
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value *= 1024;
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break;
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} else if (*next == 'M') {
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value *= 1024 * 1024;
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break;
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}
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}
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return value;
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}
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char *
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skip_token (const char *p)
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{
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p = next_token(p);
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while (*p && !g_ascii_isspace(*p)) p++;
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p = next_token(p);
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return (char *)p;
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}
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/*
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* Read functions
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*/
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enum TRY_FILE_TO_BUFFER
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{
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TRY_FILE_TO_BUFFER_OK = 0,
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TRY_FILE_TO_BUFFER_OPEN = -1,
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TRY_FILE_TO_BUFFER_READ = -2
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};
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/*
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* Doesn't handle bufsiz == 0
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*/
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int try_file_to_buffer(char *buffer, size_t bufsiz, const char *format, ...)
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{
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char path[4096];
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int fd;
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size_t len = 0;
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ssize_t nread = 0;
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va_list pa;
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if (G_UNLIKELY(bufsiz <= sizeof(char*)))
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g_warning("Huhu, bufsiz of %lu looks bad", (gulong)bufsiz);
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va_start(pa, format);
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/* C99 also provides vsnprintf */
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g_vsnprintf(path, sizeof path, format, pa);
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va_end(pa);
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bufsiz--; /* reserve 1 for trailing NUL */
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buffer [0] = '\0';
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if((fd = open (path, O_RDONLY)) < 0)
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return TRY_FILE_TO_BUFFER_OPEN;
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while (len < bufsiz) {
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nread = read (fd, buffer + len, bufsiz - len);
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if (G_UNLIKELY(nread < 0)) {
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if (errno == EINTR)
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continue;
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else
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break;
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}
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len += nread;
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if (nread == 0)
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break;
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}
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close (fd);
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if (nread < 0)
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return TRY_FILE_TO_BUFFER_READ;
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buffer [len] = '\0';
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return TRY_FILE_TO_BUFFER_OK;
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}
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void
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file_to_buffer(glibtop *server, char *buffer, size_t bufsiz, const char *filename)
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{
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switch(try_file_to_buffer(buffer, bufsiz, "%s", filename))
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{
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case TRY_FILE_TO_BUFFER_OPEN:
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glibtop_error_io_r (server, "open (%s)", filename);
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case TRY_FILE_TO_BUFFER_READ:
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glibtop_error_io_r (server, "read (%s)", filename);
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}
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}
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static unsigned long
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read_boot_time(glibtop *server)
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{
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char* line = NULL;
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size_t size = 0;
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FILE* stat;
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unsigned long btime = 0;
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if (!(stat = fopen("/proc/stat", "r"))) {
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glibtop_error_io_r(server, "fopen(\"/proc/stat\")");
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goto out;
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}
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while (getline(&line, &size, stat) != -1) {
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if (!strncmp(line, "btime", 5)) {
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btime = strtoul(skip_token(line), NULL, 10);
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break;
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}
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}
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free(line);
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fclose(stat);
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out:
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return btime;
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}
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unsigned long
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get_boot_time(glibtop *server)
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{
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static unsigned long boot_time = 0UL;
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if(G_UNLIKELY(!boot_time))
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{
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boot_time = read_boot_time(server);
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}
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return boot_time;
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}
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gboolean
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check_cpu_line(glibtop *server, const char *line, unsigned i)
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{
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char start[10];
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g_snprintf(start, sizeof start, "cpu%u", i);
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return g_str_has_prefix(line, start);
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}
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gboolean
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has_sysfs(void)
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{
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static gboolean init;
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static gboolean sysfs;
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if (G_UNLIKELY(!init)) {
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sysfs = g_file_test("/sys", G_FILE_TEST_IS_DIR);
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init = TRUE;
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}
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return sysfs;
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}
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gboolean safe_readlink(const char *path, char *buf, size_t bufsiz)
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{
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ssize_t ret;
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ret = readlink(path, buf, bufsiz - 1);
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if (ret == -1) {
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g_warning("Could not read link %s : %s", path, strerror(errno));
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return FALSE;
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}
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buf[ret] = '\0';
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return TRUE;
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}
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