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#include <_proc.h>
#include <ctype.h>
#include <dirent.h>
#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
void
usage(void)
{
fprintf(stderr, "usage: ps [path]\n");
exit(1);
}
int
main(int argc, const char *argv[])
{
const char *path = argc >= 2 ? argv[1] : "/proc/";
if (argc > 2) usage();
char *procbuf = malloc(4096);
DIR *dir = opendir(path);
if (!dir) {
err(1, "couldn't open %s", path);
}
struct dirent *de;
while ((de = readdir(dir))) {
const char *name = de->d_name;
if (isdigit(name[0])) {
FILE *g;
sprintf(procbuf, "%s%smem", path, name);
g = fopen(procbuf, "r");
if (!g) {
warn("couldn't open \"%s\"", procbuf);
strcpy(procbuf, "(can't peek)");
} else {
fseek(g, (long)&_psdata_loc->desc, SEEK_SET);
if (fread(procbuf, 1, 128, g) <= 0) {
strcpy(procbuf, "(no psdata)");
}
procbuf[128] = '\0';
fclose(g);
}
*strchr(name, '/') = '\0';
printf("%s\t%s\n", name, procbuf);
}
}
free(procbuf);
closedir(dir);
return 0;
}
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