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LibC: Implement popen() and pclose().

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I feel reasonably confident that I might have gotten these right. :^)
This commit is contained in:
Andreas Kling
2019-06-03 19:52:31 +02:00
parent e92fe52031
commit ccc6e69a29
3 changed files with 89 additions and 5 deletions
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67
LibC/stdio.cpp
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@@ -10,6 +10,7 @@
#include <fcntl.h>
#include <AK/printf.cpp>
#include <AK/StdLibExtras.h>
#include <AK/ValueRestorer.h>
#include <Kernel/Syscall.h>
extern "C" {
@@ -458,14 +459,70 @@ char* tmpnam(char*)
FILE* popen(const char* command, const char* type)
{
(void)command;
(void)type;
ASSERT_NOT_REACHED();
if (!type || (*type != 'r' && *type != 'w')) {
errno = EINVAL;
return nullptr;
}
int pipe_fds[2];
int rc = pipe(pipe_fds);
if (rc < 0) {
ValueRestorer restorer(errno);
perror("pipe");
return nullptr;
}
pid_t child_pid = fork();
if (!child_pid) {
if (*type == 'r') {
int rc = dup2(pipe_fds[1], STDOUT_FILENO);
if (rc < 0) {
perror("dup2");
exit(1);
}
close(pipe_fds[0]);
close(pipe_fds[1]);
} else if (*type == 'w') {
int rc = dup2(pipe_fds[0], STDIN_FILENO);
if (rc < 0) {
perror("dup2");
exit(1);
}
close(pipe_fds[0]);
close(pipe_fds[1]);
}
int rc = execl("/bin/sh", "sh", "-c", command, nullptr);
if (rc < 0)
perror("execl");
exit(1);
}
FILE* fp = nullptr;
if (*type == 'r') {
fp = make_FILE(pipe_fds[0]);
close(pipe_fds[1]);
} else if (*type == 'w') {
fp = make_FILE(pipe_fds[1]);
close(pipe_fds[0]);
}
fp->popen_child = child_pid;
return fp;
}
int pclose(FILE*)
int pclose(FILE* fp)
{
ASSERT_NOT_REACHED();
ASSERT(fp);
ASSERT(fp->popen_child != 0);
int wstatus = 0;
int rc = waitpid(fp->popen_child, &wstatus, 0);
if (rc < 0)
return rc;
return wstatus;
}
int remove(const char* pathname)