99strace

Table of Contents

1. Usage
2. Installation
3. Changelog
4. Sample

99strace

Command 99strace traces system calls of programs produced by the 99c compiler.

The trace is written to stderr.

Usage

99strace a.out [arguments]

Installation

To install or update 99strace

 $ go get [-u] -tags virtual.strace github.com/cznic/99c/99strace

Online documentation: godoc.org/github.com/cznic/99c/99strace

Changelog

2017-10-09: Initial public release.

Sample

$ cd ../examples/strace/
$ ls *
data.txt  main.c
$ cat main.c 
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>

#define BUFSIZE 1<<16

int main(int argc, char **argv) {
	char *buf = malloc(BUFSIZE);
	if (!buf) {
		return 1;
	}

	for (int i = 1; i < argc; i++) {
		int fd = open(argv[i], O_RDWR);
		if (fd < 0) {
			return 1;
		}

		ssize_t n;
		while ((n = read(fd, buf, BUFSIZE)) > 0) {
			write(0, buf, n);
		}
	}
	free(buf);
}
$ cat data.txt 
Lorem ipsum.
$ 99c main.c && ./a.out data.txt
Lorem ipsum.
$ 99strace a.out data.txt
malloc(0x10000) 0x7f83a9400020
open("data.txt", O_RDWR, 0) 5 errno 0
read(5, 0x7f83a9400020, 65536) 13 errno 0
Lorem ipsum.
write(0, 0x7f83a9400020, 13) 13 errno 0
read(5, 0x7f83a9400020, 65536) 0 errno 0
freep(0x7f83a9400020)
$