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//
// popen.c
//
// Pipe I/O
//
// Copyright (C) 2011 Michael Ringgaard. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//
// 1. Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
// 3. Neither the name of the project nor the names of its contributors
// may be used to endorse or promote products derived from this software
// without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
// OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
// HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
// OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
// SUCH DAMAGE.
//
#include <os.h>
#include <stdio.h>
#include <string.h>
#define SHELL "sh.exe"
FILE *popen(const char *command, const char *mode) {
char *cmdline;
int cmdlen;
int rc;
int hndl[2];
int phndl;
struct tib *tib;
struct process *proc;
FILE *f;
if (!command || *mode != 'r' && *mode != 'w') {
errno = EINVAL;
return NULL;
}
cmdlen = strlen(SHELL) + 1 + strlen(command);
cmdline = malloc(cmdlen + 1);
if (!cmdline) {
errno = ENOMEM;
return NULL;
}
strcpy(cmdline, SHELL);
strcat(cmdline, " ");
strcat(cmdline, command);
phndl = spawn(P_SUSPEND, SHELL, cmdline, NULL, &tib);
free(cmdline);
if (phndl < 0) return NULL;
proc = tib->proc;
rc = pipe(hndl);
if (rc < 0) return NULL;
if (*mode == 'w') {
if (proc->iob[0] != NOHANDLE) close(proc->iob[0]);
proc->iob[0] = hndl[0];
f = fdopen(hndl[1], mode);
} else {
if (proc->iob[1] != NOHANDLE) close(proc->iob[1]);
proc->iob[1] = hndl[1];
if (mode[1] == '2') dup2(hndl[1], proc->iob[2]);
f = fdopen(hndl[0], mode);
}
if (f == NULL) {
close(phndl);
return NULL;
}
f->phndl = phndl;
resume(phndl);
return f;
}
int pclose(FILE *stream) {
int rc;
if (stream->flag & _IORD) {
waitone(stream->phndl, INFINITE);
close(stream->phndl);
rc = fclose(stream);
} else {
int phndl = stream->phndl;
rc = fclose(stream);
waitone(phndl, INFINITE);
close(phndl);
}
return rc;
}