LibC: Implement popen and pclose

This commit is contained in:
Bananymous 2024-02-14 17:22:45 +02:00
parent f73e954b28
commit 1ba883719a
1 changed files with 79 additions and 4 deletions

View File

@ -4,6 +4,7 @@
#include <scanf_impl.h> #include <scanf_impl.h>
#include <stdarg.h> #include <stdarg.h>
#include <stdio.h> #include <stdio.h>
#include <stdlib.h>
#include <string.h> #include <string.h>
#include <sys/syscall.h> #include <sys/syscall.h>
#include <unistd.h> #include <unistd.h>
@ -15,6 +16,8 @@ struct FILE
bool eof { false }; bool eof { false };
bool error { false }; bool error { false };
int pid { -1 };
unsigned char buffer[BUFSIZ] {}; unsigned char buffer[BUFSIZ] {};
uint32_t buffer_index { 0 }; uint32_t buffer_index { 0 };
}; };
@ -455,8 +458,28 @@ char* gets(char* buffer)
} }
} }
// TODO int pclose(FILE* file)
int pclose(FILE*); {
if (file->pid == -1)
{
errno = EBADF;
return -1;
}
pid_t pid = file->pid;
(void)fclose(file);
int stat;
while (waitpid(pid, &stat, 0) != -1)
{
if (errno != EINTR)
{
stat = -1;
break;
}
}
return stat;
}
void perror(const char* string) void perror(const char* string)
{ {
@ -471,8 +494,60 @@ void perror(const char* string)
stderr->error = true; stderr->error = true;
} }
// TODO FILE* popen(const char* command, const char* mode_str)
FILE* popen(const char*, const char*); {
if ((mode_str[0] != 'r' && mode_str[0] != 'w') || mode_str[1] != '\0')
{
errno = EINVAL;
return nullptr;
}
bool read = (mode_str[0] == 'r');
int fds[2];
if (pipe(fds) == -1)
return nullptr;
pid_t pid = fork();
if (pid == 0)
{
if (read)
dup2(fds[1], STDOUT_FILENO);
else
dup2(fds[0], STDIN_FILENO);
close(fds[0]);
close(fds[1]);
execl("/bin/Shell", "sh", "-c", command, nullptr);
exit(1);
}
if (pid == -1)
{
close(fds[0]);
close(fds[1]);
return nullptr;
}
close(read ? fds[1] : fds[0]);
// FIXME: when threads are implemented
for (int i = 0; i < FOPEN_MAX; i++)
{
if (s_files[i].fd == -1)
{
s_files[i] = {
.fd = read ? fds[0] : fds[1],
.mode = (unsigned)(read ? O_RDONLY : O_WRONLY),
.pid = pid
};
return &s_files[i];
}
}
errno = EMFILE;
return nullptr;
}
int printf(const char* format, ...) int printf(const char* format, ...)
{ {