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%
% (c) The GRASP/AQUA Project, Glasgow University, 1995
%
\subsection[system.lc]{system Runtime Support}
\begin{code}
#include "rtsdefs.h"
#include "stgio.h"
#ifdef HAVE_SYS_WAIT_H
#include <sys/wait.h>
#endif
#ifdef HAVE_VFORK_H
#include <vfork.h>
#endif
#ifdef HAVE_VFORK
#define fork vfork
#endif
StgInt
systemCmd(cmd)
StgByteArray cmd;
{
int pid;
int wstat;
switch(pid = fork()) {
case -1:
if (errno != EINTR) {
cvtErrno();
stdErrno();
return -1;
}
case 0:
/* the child */
execl("/bin/sh", "sh", "-c", cmd, NULL);
_exit(127);
}
while (waitpid(pid, &wstat, 0) < 0) {
if (errno != EINTR) {
cvtErrno();
stdErrno();
return -1;
}
}
if (WIFEXITED(wstat))
return WEXITSTATUS(wstat);
else if (WIFSIGNALED(wstat)) {
ghc_errtype = ERR_INTERRUPTED;
ghc_errstr = "system command interrupted";
}
else {
/* This should never happen */
ghc_errtype = ERR_OTHERERROR;
ghc_errstr = "internal error (process neither exited nor signalled)";
}
return -1;
}
\end{code}
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