orbea / cross / slibtool

Forked from cross/slibtool 3 years ago
Clone

Blame src/helper/slbt_dump_machine.c

575cdb
/*******************************************************************/
575cdb
/*  slibtool: a skinny libtool implementation, written in C        */
78d96a
/*  Copyright (C) 2016--2017  Z. Gilboa                            */
575cdb
/*  Released under the Standard MIT License; see COPYING.SLIBTOOL. */
575cdb
/*******************************************************************/
575cdb
575cdb
#include <stdio.h>
575cdb
#include <limits.h>
575cdb
#include <unistd.h>
575cdb
#include <fcntl.h>
575cdb
#include <string.h>
575cdb
#include <stdlib.h>
575cdb
#include <stdbool.h>
575cdb
#include <sys/wait.h>
575cdb
575cdb
#include <slibtool/slibtool.h>
575cdb
#include "slibtool_spawn_impl.h"
575cdb
d986a0
static void slbt_dump_machine_child(
575cdb
	char *	program,
575cdb
	int	fd[2])
575cdb
{
575cdb
	char *	compiler;
575cdb
	char *	argv[3];
575cdb
575cdb
	if ((compiler = strchr(program,'/')))
575cdb
		compiler++;
575cdb
	else
575cdb
		compiler = program;
575cdb
575cdb
	argv[0] = compiler;
575cdb
	argv[1] = "-dumpmachine";
575cdb
	argv[2] = 0;
575cdb
575cdb
	close(fd[0]);
575cdb
f4ed8e
	if ((fd[0] = open("/dev/null",O_RDONLY)) >= 0)
f4ed8e
		if (dup2(fd[0],0) == 0)
f4ed8e
			if (dup2(fd[1],1) == 1)
f4ed8e
				execvp(program,argv);
575cdb
ec6d7a
	_exit(EXIT_FAILURE);
575cdb
}
575cdb
575cdb
int slbt_dump_machine(
575cdb
	const char *	compiler,
575cdb
	char *		machine,
575cdb
	size_t		bufsize)
575cdb
{
575cdb
	pid_t	pid;
575cdb
	pid_t	rpid;
575cdb
	int	code;
575cdb
	int	fd[2];
575cdb
	FILE *	fmachine;
575cdb
	char *	newline;
c67e64
	char *	mark;
575cdb
	char	check[2];
575cdb
	char	program[PATH_MAX];
575cdb
575cdb
	if (!machine || !bufsize)
575cdb
		return -1;
575cdb
575cdb
	if ((size_t)snprintf(program,sizeof(program),"%s",
575cdb
			compiler) >= sizeof(program))
575cdb
		return -1;
575cdb
575cdb
	if (pipe(fd))
575cdb
		return -1;
575cdb
575cdb
	if ((pid = fork()) < 0) {
575cdb
		close(fd[0]);
575cdb
		close(fd[1]);
575cdb
		return -1;
575cdb
	}
575cdb
575cdb
	if (pid == 0)
d986a0
		slbt_dump_machine_child(
575cdb
			program,
575cdb
			fd);
575cdb
575cdb
	rpid = waitpid(
575cdb
		pid,
575cdb
		&code,
575cdb
		0);
575cdb
575cdb
	if ((rpid != pid) || code) {
575cdb
		close(fd[0]);
575cdb
		close(fd[1]);
575cdb
		return -1;
575cdb
	}
575cdb
575cdb
	if ((fmachine = fdopen(fd[0],"r"))) {
575cdb
		close(fd[1]);
575cdb
		newline = 0;
575cdb
575cdb
		if (fgets(machine,bufsize,fmachine) == machine)
575cdb
			if (!fgets(check,sizeof(check),fmachine))
575cdb
				if (feof(fmachine))
575cdb
					if ((newline = strrchr(machine,'\n')))
575cdb
						*newline = 0;
575cdb
575cdb
		fclose(fmachine);
575cdb
	} else {
575cdb
		newline = 0;
575cdb
		close(fd[0]);
575cdb
		close(fd[1]);
575cdb
	}
575cdb
c67e64
	/* support the portbld <--> unknown synonym */
c67e64
	if (newline)
c67e64
		if ((mark = strstr(machine,"-portbld-")))
c67e64
			memcpy(mark,"-unknown",8);
c67e64
575cdb
	return newline ? 0 : -1;
575cdb
}