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#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#include <unistd.h"
#include "_assert.h"
#include "_stdio.h"
#ifdef __STDC_VERSION__
#include <wchar.h>
#endif
FILE * popen(const char * command, const char * mode)
{
ASSERT_NONNULL(command);
ASSERT_NONNULL(mode);
int direction = 0;
if (!strcmp(mode, "w")) {
direction = 1;
} else if (strcmp(mode, "r")) {
errno = EINVAL;
return NULL;
}
int pd[2];
if (pipe(pd) == -1) {
return NULL;
}
pid_t child = fork();
if (child == -1) {
close(pd[0]);
close(pd[1]);
return NULL;
} else if (child == 0) {
if (direction == 1) {
dup2(pd[0], STDIN_FILENO);
} else {
dup2(pd[1], STDOUT_FILENO);
}
close(pd[0]);
close(pd[1]);
execl("/bin/sh", "sh", "-c", command, (char *)0);
return NULL;
}
FILE *p = NULL;
if (direction == 1) {
p = fdopen(pd[1], "w");
} else {
p = fdopen(pd[0], "r");
}
if (p == NULL) {
return NULL;
}
#if defined __STDC_VERSION__
fwide(p, -1);
#endif
p->pipe_pid = child;
return p;
}
/*
POSIX(2)
*/
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