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