58 lines
1.2 KiB
C
58 lines
1.2 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <string.h>
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#include <err.h>
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/* backward compat in case it's not defined */
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#ifndef O_TMPFILE
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#define O_TMPFILE (020000000|O_DIRECTORY)
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#endif
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/*
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* DESCRIPTION:
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* Verify O_EXCL tmpfile cannot be linked.
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*
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* STRATEGY:
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* 1. open(2) with O_TMPFILE|O_EXCL.
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* 2. linkat(2).
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* 3. stat(2) the path to verify it wasn't created.
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*
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*/
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int
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main(void)
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{
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int i, fd;
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char spath[1024], dpath[1024];
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const char *penv[] = {"TESTDIR", "TESTFILE0"};
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struct stat sbuf;
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(void) fprintf(stdout, "Verify O_EXCL tmpfile cannot be linked.\n");
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/*
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* Get the environment variable values.
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*/
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for (i = 0; i < ARRAY_SIZE(penv); i++)
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if ((penv[i] = getenv(penv[i])) == NULL)
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errx(1, "getenv(penv[%d])", i);
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fd = open(penv[0], O_RDWR|O_TMPFILE|O_EXCL, 0666);
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if (fd < 0)
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err(2, "open(%s)", penv[0]);
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snprintf(spath, 1024, "/proc/self/fd/%d", fd);
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snprintf(dpath, 1024, "%s/%s", penv[0], penv[1]);
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if (linkat(AT_FDCWD, spath, AT_FDCWD, dpath, AT_SYMLINK_FOLLOW) == 0)
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errx(3, "linkat returned successfully\n");
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if (stat(dpath, &sbuf) == 0)
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errx(4, "stat returned successfully\n");
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return (0);
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}
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