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#include <linux/types.h>
#include "event.h"
#include "debug.h"
#include "string.h"
static pid_t event__synthesize_comm(pid_t pid, int full,
int (*process)(event_t *event))
{
event_t ev;
char filename[PATH_MAX];
char bf[BUFSIZ];
FILE *fp;
size_t size = 0;
DIR *tasks;
struct dirent dirent, *next;
pid_t tgid = 0;
snprintf(filename, sizeof(filename), "/proc/%d/status", pid);
fp = fopen(filename, "r");
if (fp == NULL) {
out_race:
/*
* We raced with a task exiting - just return:
*/
pr_debug("couldn't open %s\n", filename);
return 0;
}
memset(&ev.comm, 0, sizeof(ev.comm));
while (!ev.comm.comm[0] || !ev.comm.pid) {
if (fgets(bf, sizeof(bf), fp) == NULL)
goto out_failure;
if (memcmp(bf, "Name:", 5) == 0) {
char *name = bf + 5;
while (*name && isspace(*name))
++name;
size = strlen(name) - 1;
memcpy(ev.comm.comm, name, size++);
} else if (memcmp(bf, "Tgid:", 5) == 0) {
char *tgids = bf + 5;
while (*tgids && isspace(*tgids))
++tgids;
tgid = ev.comm.pid = atoi(tgids);
}
}
ev.comm.header.type = PERF_RECORD_COMM;
size = ALIGN(size, sizeof(u64));
ev.comm.header.size = sizeof(ev.comm) - (sizeof(ev.comm.comm) - size);
if (!full) {
ev.comm.tid = pid;
process(&ev);
goto out_fclose;
}
snprintf(filename, sizeof(filename), "/proc/%d/task", pid);
tasks = opendir(filename);
if (tasks == NULL)
goto out_race;
while (!readdir_r(tasks, &dirent, &next) && next) {
char *end;
pid = strtol(dirent.d_name, &end, 10);
if (*end)
continue;
ev.comm.tid = pid;
process(&ev);
}
closedir(tasks);
out_fclose:
fclose(fp);
return tgid;
out_failure:
pr_warning("couldn't get COMM and pgid, malformed %s\n", filename);
return -1;
}
static int event__synthesize_mmap_events(pid_t pid, pid_t tgid,
int (*process)(event_t *event))
{
char filename[PATH_MAX];
FILE *fp;
snprintf(filename, sizeof(filename), "/proc/%d/maps", pid);
fp = fopen(filename, "r");
if (fp == NULL) {
/*
* We raced with a task exiting - just return:
*/
pr_debug("couldn't open %s\n", filename);
return -1;
}
while (1) {
char bf[BUFSIZ], *pbf = bf;
event_t ev = {
.header = { .type = PERF_RECORD_MMAP },
};
int n;
size_t size;
if (fgets(bf, sizeof(bf), fp) == NULL)
break;
/* 00400000-0040c000 r-xp 00000000 fd:01 41038 /bin/cat */
n = hex2u64(pbf, &ev.mmap.start);
if (n < 0)
continue;
pbf += n + 1;
n = hex2u64(pbf, &ev.mmap.len);
if (n < 0)
continue;
pbf += n + 3;
if (*pbf == 'x') { /* vm_exec */
char *execname = strchr(bf, '/');
/* Catch VDSO */
if (execname == NULL)
execname = strstr(bf, "[vdso]");
if (execname == NULL)
continue;
size = strlen(execname);
execname[size - 1] = '\0'; /* Remove \n */
memcpy(ev.mmap.filename, execname, size);
size = ALIGN(size, sizeof(u64));
ev.mmap.len -= ev.mmap.start;
ev.mmap.header.size = (sizeof(ev.mmap) -
(sizeof(ev.mmap.filename) - size));
ev.mmap.pid = tgid;
ev.mmap.tid = pid;
process(&ev);
}
}
fclose(fp);
return 0;
}
int event__synthesize_thread(pid_t pid, int (*process)(event_t *event))
{
pid_t tgid = event__synthesize_comm(pid, 1, process);
if (tgid == -1)
return -1;
return event__synthesize_mmap_events(pid, tgid, process);
}
void event__synthesize_threads(int (*process)(event_t *event))
{
DIR *proc;
struct dirent dirent, *next;
proc = opendir("/proc");
while (!readdir_r(proc, &dirent, &next) && next) {
char *end;
pid_t pid = strtol(dirent.d_name, &end, 10);
if (*end) /* only interested in proper numerical dirents */
continue;
event__synthesize_thread(pid, process);
}
closedir(proc);
}
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