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utils.c
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utils.c
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//
// Created by shaty uka on 2024/3/20.
//
#include "utils.h"
#include <stdio.h>
#include <string.h>
#include <fcntl.h>
uintptr_t get_module_base(pid_t pid, const char* module) {
char filename[32];
char line[1024];
sprintf(filename, "/proc/%d/maps", pid);
FILE* fp = fopen(filename, "r");
if (fp == NULL) return -1;
uintptr_t addr = 0;
char perms[5];
while (fgets(line, sizeof(line), fp)) {
sscanf(line, "%lx-%*lx %s %*s %*s %*d", &addr, perms); // NOLINT(*-err34-c)
if (strstr(line, module)) {
break;
}
}
fclose(fp);
return addr;
}
size_t klog(const char* tag, const char* fmt, ...) {
static int kmsg_fd = -1;
if (unlikely(kmsg_fd == -1)) {
kmsg_fd = open("/dev/kmsg", O_WRONLY | O_CLOEXEC);
if (kmsg_fd == -1) return -1;
}
char buf[1024];
size_t offset = 0;
offset += strlcpy(buf, tag, sizeof(buf));
offset += strlcpy(buf + offset, " ", sizeof(buf) - offset);
va_list ap;
va_start(ap, fmt);
offset += vsnprintf(buf + offset, sizeof(buf) - offset, fmt, ap);
va_end(ap);
write(kmsg_fd, buf, offset);
return offset;
}