/*
* Spawn a single command.
*/
void Spawn_Single_Command(struct Process procList[], int nproc, const char *path)
{
int pid;
if (nproc > 1) {
Print("Error: pipes not supported yet\n");
return;
}
if (procList[0].flags & (INFILE|OUTFILE)) {
Print("Error: I/O redirection not supported yet\n");
return;
}
Print("program:%s\ncommand%s\npath%s\n", procList[0].program, procList[0].command,
path );
pid = Spawn_With_Path(procList[0].program, procList[0].command,
path);
if (pid < 0)
Print("Could not spawn process: %s\n", Get_Error_String(pid));
else {
int exitCode = Wait(pid);
if (exitCodes)
Print("Exit code was %d\n", exitCode);
}
}
int ttestFormat() {
int pid;
char commandline[250];
if (false) {
(void)snprintf(commandline, 249, "gfs2f.exe ide1 %u %u", disksize_mb,
blocksize);
pid = Spawn_With_Path("gfs2f.exe", commandline, "/c:/a", 0);
return Wait(pid);
} else {
return 0;
}
}
/*
* Spawn a single command.
*/
void Spawn_Single_Command(struct Process *proc, const char *path,
int background) {
int pid;
pid = proc->pid = Spawn_With_Path(proc->program, proc->command, path,
background);
if (pid < 0)
Print("Could not spawn process: %s\n", Get_Error_String(pid));
else {
int exitCode = Wait(pid);
if (exitCodes)
Print("Exit code was %d\n", exitCode);
}
}
/*
* Spawn a pipeline.
*/
void Spawn_Pipeline(struct Process procList[], int nproc, const char *path)
{
int i;
int numSpawned, exitCode=0;
bool err = false;
struct Process *prev;
/*
* Spawn all processes in the pipeline, opening input/output files
* and pipes as needed.
*/
for (i = 0, numSpawned = 0, prev = 0; !err && i < nproc; ++i, ++numSpawned) {
struct Process *proc = &procList[i];
int readfd = 0, writefd = 1;
proc->readfd = proc->writefd = proc->pipefd = proc->pid = -1;
/* Open input file */
if (proc->flags & INFILE) {
readfd = Open(proc->infile, O_READ);
if (readfd < 0) {
Print("Could not open file: %s\n", Get_Error_String(readfd));
err = true;
}
}
if (!err) {
/* Open output file or pipe */
if (proc->flags & OUTFILE) {
writefd = Open(proc->outfile, O_WRITE|O_CREATE);
if (writefd < 0) {
Print("Could not open file: %s\n", Get_Error_String(writefd));
err = true;
}
} else if (proc->flags & PIPE) {
int rc = Create_Pipe(&proc->pipefd, &writefd);
if (rc != 0) {
Print("Could not create pipe: %s\n", Get_Error_String(rc));
err = true;
}
}
}
/* Is output being piped from previous process? */
if (!err && prev != 0 && (prev->flags & PIPE)) {
readfd = prev->pipefd;
}
proc->readfd = readfd;
proc->writefd = writefd;
if (!err) {
proc->pid = Spawn_With_Path(proc->program, proc->command, proc->readfd, proc->writefd, path);
if (proc->pid < 0) {
Print("Could not spawn process: %s\n", Get_Error_String(proc->pid));
err = true;
}
}
prev = proc;
}
/*
* Close all pipes and I/O redirection file descriptors
* (except the shell's stdin and stdout).
* This won't affect the child processes because they have
* their own Cloned versions of the File objects.
*/
for (i = 0, prev = 0; i < numSpawned; ++i) {
struct Process *proc = &procList[i];
if (proc->readfd > 1)
Close(proc->readfd);
if (proc->writefd > 1)
Close(proc->writefd);
if (i == numSpawned - 1 && (proc->flags & PIPE)) {
/*
* Process meant to read from this pipe was never spawned.
* The read fd for the pipe is stored in the "pipefd" field.
*/
Close(proc->pipefd);
}
}
/*
* Wait for all processes to exit.
*/
for (i = 0; i < numSpawned; ++i) {
struct Process *proc = &procList[i];
if (proc->pid >= 0)
exitCode = Wait(proc->pid);
}
if (numSpawned > 0 && exitCodes)
Print("Exit code was %d\n", exitCode);
}