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cmd/ps: use dirent.h

This commit is contained in:
dzwdz 2023-08-31 01:17:58 +02:00
parent 6cbe587977
commit fd7be968dd
1 changed files with 22 additions and 32 deletions
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54
src/cmd/ps/ps.c
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@ -1,5 +1,6 @@
#include <_proc.h>
#include <ctype.h>
#include <dirent.h>
#include <err.h>
#include <stdio.h>
#include <stdlib.h>
@ -18,47 +19,36 @@ main(int argc, const char *argv[])
const char *path = argc >= 2 ? argv[1] : "/proc/";
if (argc > 2) usage();
char *readbuf = malloc(4096);
char *procbuf = malloc(4096);
FILE *f = fopen(path, "r");
if (!f) {
DIR *dir = opendir(path);
if (!dir) {
err(1, "couldn't open %s", path);
}
// TODO library for iterating over directories
for (;;) {
int len = fread(readbuf, 1, 4096, f);
if (len <= 0) break;
for (int pos = 0; pos < len; ) {
char *end = memchr(readbuf + pos, 0, len - pos);
if (!end) {
errx(1, "unimplemented: buffer overflow");
}
size_t entryl = end - (readbuf+pos) + 1;
if (isdigit(readbuf[pos])) {
FILE *g;
sprintf(procbuf, "%s%smem", path, readbuf+pos);
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);
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)");
}
end[-1] = '\0'; /* remove trailing slash */
printf("%s\t%s\n", readbuf+pos, procbuf);
procbuf[128] = '\0';
fclose(g);
}
pos += entryl;
*strchr(name, '/') = '\0';
printf("%s\t%s\n", name, procbuf);
}
}
free(readbuf);
free(procbuf);
fclose(f);
closedir(dir);
return 0;
}