Linux Processes and System Calls, Traced With strace

Originally published on Code Beneath. What is strace and Why You Need It native language integration, strace is often the fastest way to see what went wrong. A Minimal C Program to Trace #include #include #include #include #include #include int main() { // Open and read a file int fd = open("test.txt", O_RDONLY | O_CREAT, 0644); if (fd == -1) { perror("open"); return 1; } // Write some content first int wfd = open("test.txt", O_WRONLY | O_TRUNC); write(wfd, "hello from test file\n", 21); close(wfd); // Read it back char buf[256]; ssize_t n = read(fd, buf, sizeof(buf)); if (n > 0) { write(STDOU