termux-packages/packages/squid/posix-shm-support.patch

diff -uNr squid-4.12/src/ipc/mem/Segment.cc squid-4.12.mod/src/ipc/mem/Segment.cc
--- squid-4.12/src/ipc/mem/Segment.cc	2020-06-07 18:42:16.000000000 +0300
+++ squid-4.12.mod/src/ipc/mem/Segment.cc	2020-08-07 22:10:14.210431881 +0300
@@ -31,6 +31,65 @@
 #include <unistd.h>
 #endif
 
+static int termux_shm_unlink(const char *name) {
+    size_t namelen;
+    char *fname;
+
+    /* Construct the filename.  */
+    while (name[0] == '/') ++name;
+
+    if (name[0] == '\0') {
+        /* The name "/" is not supported.  */
+        errno = EINVAL;
+        return -1;
+    }
+
+    namelen = strlen(name);
+    fname = (char *) alloca(sizeof("@TERMUX_PREFIX@/tmp/") - 1 + namelen + 1);
+    memcpy(fname, "@TERMUX_PREFIX@/tmp/", sizeof("@TERMUX_PREFIX@/tmp/") - 1);
+    memcpy(fname + sizeof("@TERMUX_PREFIX@/tmp/") - 1, name, namelen + 1);
+
+    return unlink(fname);
+}
+
+static int termux_shm_open(const char *name, int oflag, mode_t mode) {
+    size_t namelen;
+    char *fname;
+    int fd;
+
+    /* Construct the filename.  */
+    while (name[0] == '/') ++name;
+
+    if (name[0] == '\0') {
+        /* The name "/" is not supported.  */
+        errno = EINVAL;
+        return -1;
+    }
+
+    namelen = strlen(name);
+    fname = (char *) alloca(sizeof("@TERMUX_PREFIX@/tmp/") - 1 + namelen + 1);
+    memcpy(fname, "@TERMUX_PREFIX@/tmp/", sizeof("@TERMUX_PREFIX@/tmp/") - 1);
+    memcpy(fname + sizeof("@TERMUX_PREFIX@/tmp/") - 1, name, namelen + 1);
+
+    fd = open(fname, oflag, mode);
+    if (fd != -1) {
+        /* We got a descriptor.  Now set the FD_CLOEXEC bit.  */
+        int flags = fcntl(fd, F_GETFD, 0);
+        flags |= FD_CLOEXEC;
+        flags = fcntl(fd, F_SETFD, flags);
+
+        if (flags == -1) {
+            /* Something went wrong.  We cannot return the descriptor.  */
+            int save_errno = errno;
+            close(fd);
+            fd = -1;
+            errno = save_errno;
+        }
+    }
+
+    return fd;
+}
+
 // test cases change this
 const char *Ipc::Mem::Segment::BasePath = DEFAULT_STATEDIR;
 
@@ -134,7 +193,7 @@
 {
     assert(theFD < 0);
 
-    theFD = shm_open(theName.termedBuf(), O_RDWR, 0);
+    theFD = termux_shm_open(theName.termedBuf(), O_RDWR, 0);
     if (theFD < 0) {
         int xerrno = errno;
         debugs(54, 5, "shm_open " << theName << ": " << xstrerr(xerrno));
@@ -154,7 +213,7 @@
 bool
 Ipc::Mem::Segment::createFresh(int &xerrno)
 {
-    theFD = shm_open(theName.termedBuf(),
+    theFD = termux_shm_open(theName.termedBuf(),
                      O_EXCL | O_CREAT | O_RDWR,
                      S_IRUSR | S_IWUSR);
     xerrno = errno;
@@ -237,7 +296,7 @@
 void
 Ipc::Mem::Segment::unlink()
 {
-    if (shm_unlink(theName.termedBuf()) != 0) {
+    if (termux_shm_unlink(theName.termedBuf()) != 0) {
         int xerrno = errno;
         debugs(54, 5, "shm_unlink(" << theName << "): " << xstrerr(xerrno));
     } else