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#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <wayland-client.h>
#include <sys/socket.h>
#include <errno.h>
#define PROCESS_NAME_MAX_LENGTH 1024
char name[PROCESS_NAME_MAX_LENGTH] = "";
static pid_t
pid_from_fd(int fd)
{
struct ucred ucred;
socklen_t len = sizeof(struct ucred);
if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &ucred, &len) == -1) {
perror("getsockopt failed");
exit(-1);
}
return ucred.pid;
}
static char *
process_name_from_pid(const pid_t pid) {
char proc_buf[64];
sprintf(proc_buf, "/proc/%d/comm", pid);
FILE *fp;
if ((fp = fopen(proc_buf, "r")) == NULL) {
fprintf(stderr, "opening '%s' failed: %s\n", proc_buf, strerror(errno));
exit(-1);
}
if (fgets(name, PROCESS_NAME_MAX_LENGTH, fp) == NULL) {
fprintf(stderr, "reading '%s' failed\n", proc_buf);
exit(-1);
}
name[strcspn(name, "\n")] = 0;
fclose(fp);
return name;
}
char *
process_name_from_fd(struct wl_display *display)
{
int fd = wl_display_get_fd(display);
pid_t pid = pid_from_fd(fd);
char *process_name = process_name_from_pid(pid);
return process_name;
}
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