98 lines
1.9 KiB
Diff
98 lines
1.9 KiB
Diff
---
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lib/sh/tmpfile.c | 49 ++++++++++++++++++++++++++++++++++++++++++++++++-
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1 file changed, 48 insertions(+), 1 deletion(-)
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--- lib/sh/tmpfile.c
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+++ lib/sh/tmpfile.c 2018-01-24 12:38:42.410481352 +0000
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@@ -36,6 +36,14 @@
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#include <stdio.h>
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#include <errno.h>
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+#if defined(__linux__)
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+# include <sys/statfs.h>
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+# include <unistd.h>
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+# ifndef TMPFS_MAGIC
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+# define TMPFS_MAGIC 0x01021994
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+# endif
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+#endif
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+
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#include <shell.h>
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#ifndef errno
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@@ -65,6 +73,8 @@ static unsigned long filenum = 1L;
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static char *
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get_sys_tmpdir ()
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{
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+ static int doshm;
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+
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if (sys_tmpdir)
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return sys_tmpdir;
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@@ -91,6 +101,31 @@ get_sys_tmpdir ()
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return sys_tmpdir;
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}
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+#if defined(__linux__)
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+static int
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+emergency_sys_tmpdir ()
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+{
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+ static char *shm = "/dev/shm";
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+ static size_t pgsz;
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+ struct statfs fs;
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+ static int doshm;
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+
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+ if (getuid() != 0)
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+ return 0;
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+
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+ if (doshm)
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+ return 0;
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+
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+ doshm++;
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+
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+ if (statfs(shm, &fs) < 0 || fs.f_type != TMPFS_MAGIC || eaccess(shm, W_OK|X_OK))
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+ return 0;
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+
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+ sys_tmpdir = shm;
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+ return 1;
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+}
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+#endif
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+
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static char *
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get_tmpdir (flags)
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int flags;
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@@ -194,7 +229,8 @@ sh_mktmpfd (nameroot, flags, namep)
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{
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char *filename, *tdir, *lroot;
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int fd, tdlen;
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-
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+
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+enospace:
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filename = (char *)xmalloc (PATH_MAX + 1);
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tdir = get_tmpdir (flags);
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tdlen = strlen (tdir);
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@@ -217,6 +253,10 @@ sh_mktmpfd (nameroot, flags, namep)
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free (filename);
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filename = NULL;
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}
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+
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+ if (fd < 0 && errno == ENOSPC && emergency_sys_tmpdir())
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+ goto enospace;
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+
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if (namep)
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*namep = filename;
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return fd;
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@@ -235,6 +275,13 @@ sh_mktmpfd (nameroot, flags, namep)
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}
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while (fd < 0 && errno == EEXIST);
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+ if (fd < 0 && errno == ENOSPC && emergency_sys_tmpdir())
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+ {
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+ free (filename);
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+ filename = NULL;
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+ goto enospace;
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+ }
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+
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if (namep)
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*namep = filename;
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else
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