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 eventsource

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platform_linux.cc

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#include "node.h"

#include "platform.h"

#include <sys/param.h> // for MAXPATHLEN

#include <unistd.h> // getpagesize

/* SetProcessTitle */

#include <sys/prctl.h>

#include <linux/prctl.h>

#include <stdlib.h> // free

#include <string.h> // strdup

namespace node {

static char buf[MAXPATHLEN + 1];

static char *process_title;

char** OS::SetupArgs(int argc, char *argv[]) {

process_title = strdup(argv[0]);

return argv;

}

void OS::SetProcessTitle(char *title) {

if (process_title) free(process_title);

process_title = strdup(title);

prctl(PR_SET_NAME, process_title);

}

const char* OS::GetProcessTitle(int *len) {

if (process_title) {

*len = strlen(process_title);

return process_title;

}

*len = 0;

return NULL;

}

int OS::GetMemory(size_t *rss, size_t *vsize) {

FILE *f = fopen("/proc/self/stat", "r");

if (!f) return -1;

int itmp;

char ctmp;

size_t page_size = getpagesize();

/* PID */

if (fscanf(f, "%d ", &itmp) == 0) goto error; /* coverity[secure_coding] */

/* Exec file */

if (fscanf (f, "%s ", buf) == 0) goto error; /* coverity[secure_coding] */

/* State */

if (fscanf (f, "%c ", &ctmp) == 0) goto error; /* coverity[secure_coding] */

/* Parent process */

if (fscanf (f, "%d ", &itmp) == 0) goto error; /* coverity[secure_coding] */

/* Process group */

if (fscanf (f, "%d ", &itmp) == 0) goto error; /* coverity[secure_coding] */

/* Session id */

if (fscanf (f, "%d ", &itmp) == 0) goto error; /* coverity[secure_coding] */

/* TTY */

if (fscanf (f, "%d ", &itmp) == 0) goto error; /* coverity[secure_coding] */

/* TTY owner process group */

if (fscanf (f, "%d ", &itmp) == 0) goto error; /* coverity[secure_coding] */

/* Flags */

if (fscanf (f, "%u ", &itmp) == 0) goto error; /* coverity[secure_coding] */

/* Minor faults (no memory page) */

if (fscanf (f, "%u ", &itmp) == 0) goto error; /* coverity[secure_coding] */

/* Minor faults, children */

if (fscanf (f, "%u ", &itmp) == 0) goto error; /* coverity[secure_coding] */

/* Major faults (memory page faults) */

if (fscanf (f, "%u ", &itmp) == 0) goto error; /* coverity[secure_coding] */

/* Major faults, children */

if (fscanf (f, "%u ", &itmp) == 0) goto error; /* coverity[secure_coding] */

/* utime */

if (fscanf (f, "%d ", &itmp) == 0) goto error; /* coverity[secure_coding] */

/* stime */

if (fscanf (f, "%d ", &itmp) == 0) goto error; /* coverity[secure_coding] */

/* utime, children */

if (fscanf (f, "%d ", &itmp) == 0) goto error; /* coverity[secure_coding] */

/* stime, children */

if (fscanf (f, "%d ", &itmp) == 0) goto error; /* coverity[secure_coding] */

/* jiffies remaining in current time slice */

if (fscanf (f, "%d ", &itmp) == 0) goto error; /* coverity[secure_coding] */

/* 'nice' value */

if (fscanf (f, "%d ", &itmp) == 0) goto error; /* coverity[secure_coding] */

/* jiffies until next timeout */

if (fscanf (f, "%u ", &itmp) == 0) goto error; /* coverity[secure_coding] */

/* jiffies until next SIGALRM */

if (fscanf (f, "%u ", &itmp) == 0) goto error; /* coverity[secure_coding] */

/* start time (jiffies since system boot) */

if (fscanf (f, "%d ", &itmp) == 0) goto error; /* coverity[secure_coding] */

/* Virtual memory size */

if (fscanf (f, "%u ", &itmp) == 0) goto error; /* coverity[secure_coding] */

*vsize = (size_t) itmp;

/* Resident set size */

if (fscanf (f, "%u ", &itmp) == 0) goto error; /* coverity[secure_coding] */

*rss = (size_t) itmp * page_size;

/* rlim */

if (fscanf (f, "%u ", &itmp) == 0) goto error; /* coverity[secure_coding] */

/* Start of text */

if (fscanf (f, "%u ", &itmp) == 0) goto error; /* coverity[secure_coding] */

/* End of text */

if (fscanf (f, "%u ", &itmp) == 0) goto error; /* coverity[secure_coding] */

/* Start of stack */

if (fscanf (f, "%u ", &itmp) == 0) goto error; /* coverity[secure_coding] */

fclose (f);

return 0;

error:

fclose (f);

return -1;

}

int OS::GetExecutablePath(char* buffer, size_t* size) {

*size = readlink("/proc/self/exe", buffer, *size - 1);

if (*size <= 0) return -1;

buffer[*size] = '\0';

return 0;

}

} // namespace node