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#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <time.h>
#include <unistd.h>
#include <pthread.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <sys/types.h>
typedef struct f_comp_data {
char *f1;
char *f2;
} f_comp_data;
void *f1_newer(void *arg) {
f_comp_data *files = (f_comp_data *) arg;
char *f1 = files->f1;
char *f2 = files->f2;
struct stat f1_attr;
struct stat f2_attr;
stat(f1, &f1_attr);
stat(f2, &f2_attr);
int diff = difftime(f1_attr.st_mtime, f2_attr.st_mtime);
int ret = 0;
if (diff <= 0) {
pthread_exit(&ret);
}
ret = 1;
pthread_exit(&ret);
}
void *create_make() {
/* Create simple makefile */
int fd = creat("makefile", 00644);
FILE *file = fdopen(fd, "w");
fprintf(file, "debug: main.c\n\tgcc -Wall main.c -o ./bin/debug\nrelease: main.c\n\tgcc -O2 -march=native main.c -o ./bin/release");
fclose(file);
return NULL;
}
int main(int argc, char *argv[]) {
/* Struct to hold files */
f_comp_data files;
files.f1 = "main.c";
files.f2 = "./bin/debug";
/* Parse args to determine which mode to run in
* Not very robust, needs improvement
*/
enum { RUN, BUILD, BUILD_RELEASE } mode = RUN;
if (argc > 1) {
switch(argv[1][0]) {
case 'r': break;
case 'b':
if (argc > 2) {
mode = BUILD_RELEASE;
files.f2 = "./bin/release";
break;
}
mode = BUILD; break;
default: printf("Unknown argument: '%s'\nDefaulting to 'run'\n", argv[1]);
}
}
/* Threads to:
* create makefile
* check age of source vs. bin
*/
pthread_t f_thread, check_thread;
pthread_create(&f_thread, NULL, create_make, NULL);
pthread_create(&check_thread, NULL, f1_newer, (void *)&files);
mkdir("./bin", 0777);
pthread_join(f_thread, NULL);
/* Get value from thread which checks if the bin
* is older than the source code
*/
void *newer;
pthread_join(check_thread, &newer);
int recomp = *(int *) newer;
if (recomp) {
pid_t make_pid;
if ((make_pid = fork()) == 0) {
printf("Recompiling...\n");
switch (mode) {
case BUILD_RELEASE:
execl("/usr/bin/make", "make", "release", NULL);
break;
default:
execl("/usr/bin/make", "make", "debug", NULL);
}
}
waitpid(make_pid, NULL, 0);
}
if (mode == RUN) {
pid_t x_pid;
if ((x_pid = fork()) == 0) {
execl(files.f2, "tmp", NULL);
}
waitpid(x_pid, NULL, 0);
}
return 0;
}
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