Move System.Posix.Signals from base

Also adds System.Posix.Process.Internals in order to make the deps work out.

1 files changed, 175 insertions, 0 deletions

diff --git a/cbits/execvpe.c b/cbits/execvpe.c
new file mode 100644
index 0000000..160271c
--- /dev/null
+++ b/cbits/execvpe.c
@@ -0,0 +1,175 @@
+/* -----------------------------------------------------------------------------
+   (c) The University of Glasgow 1995-2004
+
+   Our low-level exec() variant.
+   -------------------------------------------------------------------------- */
+#include "execvpe.h"
+
+#if !(defined(_MSC_VER) || defined(__MINGW32__) || defined(_WIN32)) /* to the end */
+
+/* Evidently non-Posix. */
+/* #include "PosixSource.h" */
+
+#include <unistd.h>
+#include <sys/time.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+
+/*
+ * We want the search semantics of execvp, but we want to provide our
+ * own environment, like execve.  The following copyright applies to
+ * this code, as it is a derivative of execvp:
+ *-
+ * Copyright (c) 1991 The Regents of the University of California.
+ * 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. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University 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 REGENTS 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 REGENTS 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.
+ */
+
+int
+execvpe(char *name, char *const argv[], char **envp)
+{
+    register int lp, ln;
+    register char *p;
+    int eacces=0, etxtbsy=0;
+    char *bp, *cur, *path, *buf = 0;
+
+    /* If it's an absolute or relative path name, it's easy. */
+    if (strchr(name, '/')) {
+	bp = (char *) name;
+	cur = path = buf = NULL;
+	goto retry;
+    }
+
+    /* Get the path we're searching. */
+    if (!(path = getenv("PATH"))) {
+#ifdef HAVE_CONFSTR
+        ln = confstr(_CS_PATH, NULL, 0);
+        if ((cur = path = malloc(ln + 1)) != NULL) {
+	    path[0] = ':';
+	    (void) confstr (_CS_PATH, path + 1, ln);
+	}
+#else
+        if ((cur = path = malloc(1 + 1)) != NULL) {
+	    path[0] = ':';
+	    path[1] = '\0';
+	}
+#endif
+    } else
+	cur = path = strdup(path);
+
+    if (path == NULL || (bp = buf = malloc(strlen(path)+strlen(name)+2)) == NULL)
+	goto done;
+
+    while (cur != NULL) {
+	p = cur;
+        if ((cur = strchr(cur, ':')) != NULL)
+	    *cur++ = '\0';
+
+	/*
+	 * It's a SHELL path -- double, leading and trailing colons mean the current
+	 * directory.
+	 */
+	if (!*p) {
+	    p = ".";
+	    lp = 1;
+	} else
+	    lp = strlen(p);
+	ln = strlen(name);
+
+	memcpy(buf, p, lp);
+	buf[lp] = '/';
+	memcpy(buf + lp + 1, name, ln);
+	buf[lp + ln + 1] = '\0';
+
+      retry:
+        (void) execve(bp, argv, envp);
+	switch (errno) {
+	case EACCES:
+	    eacces = 1;
+	    break;
+	case ENOENT:
+	    break;
+	case ENOEXEC:
+	    {
+		register size_t cnt;
+		register char **ap;
+
+		for (cnt = 0, ap = (char **) argv; *ap; ++ap, ++cnt)
+		    ;
+		if ((ap = malloc((cnt + 2) * sizeof(char *))) != NULL) {
+		    memcpy(ap + 2, argv + 1, cnt * sizeof(char *));
+
+		    ap[0] = "sh";
+		    ap[1] = bp;
+		    (void) execve("/bin/sh", ap, envp);
+		    free(ap);
+		}
+		goto done;
+	    }
+	case ETXTBSY:
+	    if (etxtbsy < 3)
+		(void) sleep(++etxtbsy);
+	    goto retry;
+	default:
+	    goto done;
+	}
+    }
+    if (eacces)
+	errno = EACCES;
+    else if (!errno)
+	errno = ENOENT;
+  done:
+    if (path)
+	free(path);
+    if (buf)
+	free(buf);
+    return (-1);
+}
+
+
+/* Copied verbatim from ghc/lib/std/cbits/system.c. */
+void pPrPr_disableITimers (void)
+{
+#  ifdef HAVE_SETITIMER
+   /* Reset the itimers in the child, so it doesn't get plagued
+    * by SIGVTALRM interrupts.
+    */
+   struct timeval tv_null = { 0, 0 };
+   struct itimerval itv;
+   itv.it_interval = tv_null;
+   itv.it_value = tv_null;
+   setitimer(ITIMER_REAL, &itv, NULL);
+   setitimer(ITIMER_VIRTUAL, &itv, NULL);
+   setitimer(ITIMER_PROF, &itv, NULL);
+#  endif
+}
+
+#endif