84 lines
2.9 KiB
Diff
84 lines
2.9 KiB
Diff
From b77db7fa6cd00e1412fdd186180996f8d622b275 Mon Sep 17 00:00:00 2001
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From: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
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Date: Sun, 7 Sep 2014 12:21:04 +0200
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Subject: [PATCH 5/5] ld_iscsi: fix largefile related issues
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This commit fixes two related issues in the ld_iscsi example with
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largefile support.
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The first issue appears when building libiscsi against the glibc C
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library, with the flags -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
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-D_FILE_OFFSET_BITS=64:
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{standard input}: Assembler messages:
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{standard input}:2774: Error: symbol `__fxstat64' is already defined
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{standard input}:2850: Error: symbol `__lxstat64' is already defined
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{standard input}:2938: Error: symbol `__xstat64' is already defined
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This is due to the fact that when _FILE_OFFSET_BITS=64 is passed, the
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*64() functions are defined by the C library as aliases to the
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non-64*() functions, because those ones directly support large files
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(i.e 64 bits).
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The second issue appears when building libiscsi against the uClibc C
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library, in a configuration that doesn't have largefile support. In
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this case, the ld_iscsi that tries to use stat64 or some other *64()
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functions cannot build, because such functions are not provided by the
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C library. Of course, ld_iscsi does not need to wrap the *64()
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functions in such a situation, because they do not exist.
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This commit fixes those problems by enclosing the *64() related code
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of ld_iscsi in the following compile time conditional:
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This ensures that the *64() function handling is here only if
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largefile support is available and enabled (_LARGEFILE_SOURCE64) and
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if non-*64() functions are not already 64 bits capable (in which case
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the 64*() functions are just aliases for the non-64*() ones).
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See also
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http://www.gnu.org/software/libc/manual/html_node/Feature-Test-Macros.html
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for more details about the meaning of those macros.
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Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
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---
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examples/ld_iscsi.c | 4 ++++
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1 file changed, 4 insertions(+)
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diff --git a/examples/ld_iscsi.c b/examples/ld_iscsi.c
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index 0cf2724..02f9d25 100644
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--- a/examples/ld_iscsi.c
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+++ b/examples/ld_iscsi.c
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@@ -543,6 +543,7 @@ int dup2(int oldfd, int newfd)
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return real_dup2(oldfd, newfd);
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}
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+#if defined(_LARGEFILE64_SOURCE) && _FILE_OFFSET_BITS != 64
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int (*real_fxstat64)(int ver, int fd, struct stat64 *buf);
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@@ -591,6 +592,7 @@ int __xstat64(int ver, const char *path, struct stat64 *buf)
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return __lxstat64(ver, path, buf);
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}
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+#endif
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static void __attribute__((constructor)) _init(void)
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{
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@@ -669,6 +671,7 @@ static void __attribute__((constructor)) _init(void)
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exit(10);
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}
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+#if defined(_LARGEFILE64_SOURCE) && _FILE_OFFSET_BITS != 64
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real_fxstat64 = dlsym(RTLD_NEXT, "__fxstat64");
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if (real_fxstat64 == NULL) {
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LD_ISCSI_DPRINTF(0,"Failed to dlsym(__fxstat64)");
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@@ -683,4 +686,5 @@ static void __attribute__((constructor)) _init(void)
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if (real_xstat64 == NULL) {
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LD_ISCSI_DPRINTF(0,"Failed to dlsym(__xstat64)");
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}
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+#endif
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}
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--
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2.0.0
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