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/* Utility to print running total of VmPeak and VmSize of a program */
#define _GNU_SOURCE
#include <sys/types.h>
#include <sys/wait.h>
#include <signal.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#define PATH_MAX 2048
int child_pid;
static int main_loop(char *pidstatus)
{
char *line;
char *vmsize;
char *vmpeak;
char *vmrss;
char *vmhwm;
size_t len;
FILE *f;
vmsize = NULL;
vmpeak = NULL;
vmrss = NULL;
vmhwm = NULL;
line = malloc(128);
len = 128;
f = fopen(pidstatus, "r");
if (!f) return 1;
/* Read memory size data from /proc/pid/status */
while (!vmsize || !vmpeak || !vmrss || !vmhwm)
{
if (getline(&line, &len, f) == -1)
{
/* Some of the information isn't there, die.
Hopefully we have at least one measure. */
return 1;
}
/* Find VmPeak */
if (!strncmp(line, "VmPeak:", 7))
{
vmpeak = strdup(&line[7]);
}
/* Find VmSize */
else if (!strncmp(line, "VmSize:", 7))
{
vmsize = strdup(&line[7]);
}
/* Find VmRSS */
else if (!strncmp(line, "VmRSS:", 6))
{
vmrss = strdup(&line[7]);
}
/* Find VmHWM */
else if (!strncmp(line, "VmHWM:", 6))
{
vmhwm = strdup(&line[7]);
}
}
free(line);
fclose(f);
/* Get rid of " kB\n"*/
len = strlen(vmsize);
vmsize[len - 4] = 0;
len = strlen(vmpeak);
vmpeak[len - 4] = 0;
len = strlen(vmrss);
vmrss[len - 4] = 0;
len = strlen(vmhwm);
vmhwm[len - 4] = 0;
/* Output results to stderr */
fprintf(stderr, "%s;%s;%s;%s\n", vmsize, vmpeak, vmrss, vmhwm);
free(vmpeak);
free(vmsize);
free(vmrss);
free(vmhwm);
/* Success */
return 0;
}
static int usage(char *me)
{
fprintf(stderr, "%s: filename args\n", me);
fprintf(stderr, "Run program, and print VmSize, VmPeak, VmRSS and VmHWM (in KiB) to stderr\n");
return 1;
}
static int child(int argc, char **argv)
{
char **newargs = malloc(sizeof(char *) * argc);
int i;
/* We can't be certain that argv is NULL-terminated, so do that now */
for (i = 0; i < argc - 1; i++)
{
newargs[i] = argv[i+1];
}
newargs[argc - 1] = NULL;
/* Launch the child */
execvp(argv[1], newargs);
return 0;
}
static void sig_chld(int dummy)
{
int status, child_val;
int pid;
(void) dummy;
pid = waitpid(-1, &status, WNOHANG);
if (pid < 0)
{
fprintf(stderr, "waitpid failed\n");
return;
}
/* Only worry about direct child */
if (pid != child_pid) return;
/* Get child status value */
if (WIFEXITED(status))
{
fprintf(stderr, "# End memusage\n");
child_val = WEXITSTATUS(status);
exit(child_val);
}
else if (WIFSIGNALED(status))
{
fprintf(stderr, "Child terminated by signal %d\n", WTERMSIG(status));
exit(1);
}
}
int main(int argc, char **argv)
{
char buf[PATH_MAX];
struct sigaction act;
if (argc < 2) return usage(argv[0]);
act.sa_handler = sig_chld;
/* We don't want to block any other signals */
sigemptyset(&act.sa_mask);
act.sa_flags = SA_NOCLDSTOP;
if (sigaction(SIGCHLD, &act, NULL) < 0)
{
perror("sigaction");
return 1;
}
child_pid = fork();
if (!child_pid) return child(argc, argv);
snprintf(buf, PATH_MAX, "/proc/%d/status", child_pid);
fprintf(stderr, "VmSize;VmPeak;VmRSS;VmHWM\n");
/* Continual scan of proc */
while (!main_loop(buf))
{
/* Wait for 0.1 sec */
usleep(100000);
}
/* This should never be reached we exit when our child exits */
return 1;
}
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