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From e2cfb44540873fc0a566a8a119c550a64a38c319 Mon Sep 17 00:00:00 2001
From: Patrick Stewart <patrick@rfcreations.com>
Date: Thu, 14 Sep 2017 18:26:22 +0100
Subject: [PATCH] Revert "Assume prlimit64 is available."
This reverts commit 695d7d138eda449678a1650a8b8b58181033353f.
---
sysdeps/unix/sysv/linux/getrlimit64.c | 35 ++++++++++++++++++++++++++++++-
sysdeps/unix/sysv/linux/kernel-features.h | 5 +++++
sysdeps/unix/sysv/linux/prlimit.c | 10 +++++++++
sysdeps/unix/sysv/linux/setrlimit.c | 7 ++++++-
sysdeps/unix/sysv/linux/setrlimit64.c | 31 ++++++++++++++++++++++++++-
5 files changed, 85 insertions(+), 3 deletions(-)
diff --git a/sysdeps/unix/sysv/linux/getrlimit64.c b/sysdeps/unix/sysv/linux/getrlimit64.c
index 56af3c0646..37c173286f 100644
--- a/sysdeps/unix/sysv/linux/getrlimit64.c
+++ b/sysdeps/unix/sysv/linux/getrlimit64.c
@@ -35,7 +35,40 @@
int
__getrlimit64 (enum __rlimit_resource resource, struct rlimit64 *rlimits)
{
- return INLINE_SYSCALL_CALL (prlimit64, 0, resource, NULL, rlimits);
+#ifdef __NR_prlimit64
+ int res = INLINE_SYSCALL_CALL (prlimit64, 0, resource, NULL, rlimits);
+ if (res == 0 || errno != ENOSYS)
+ return res;
+#endif
+
+/* The fallback code only makes sense if the platform supports either
+ __NR_ugetrlimit and/or __NR_getrlimit. */
+#if defined (__NR_ugetrlimit) || defined (__NR_getrlimit)
+# ifndef __NR_ugetrlimit
+# define __NR_ugetrlimit __NR_getrlimit
+# endif
+# if __RLIM_T_MATCHES_RLIM64_T
+# define rlimits32 (*rlimits)
+# else
+ struct rlimit rlimits32;
+# endif
+
+ if (INLINE_SYSCALL_CALL (ugetrlimit, resource, &rlimits32) < 0)
+ return -1;
+
+# if !__RLIM_T_MATCHES_RLIM64_T
+ if (rlimits32.rlim_cur == RLIM_INFINITY)
+ rlimits->rlim_cur = RLIM64_INFINITY;
+ else
+ rlimits->rlim_cur = rlimits32.rlim_cur;
+ if (rlimits32.rlim_max == RLIM_INFINITY)
+ rlimits->rlim_max = RLIM64_INFINITY;
+ else
+ rlimits->rlim_max = rlimits32.rlim_max;
+# endif /* !__RLIM_T_MATCHES_RLIM64_T */
+#endif /* defined (__NR_ugetrlimit) || defined (__NR_getrlimit) */
+
+ return 0;
}
libc_hidden_def (__getrlimit64)
diff --git a/sysdeps/unix/sysv/linux/kernel-features.h b/sysdeps/unix/sysv/linux/kernel-features.h
index 9495db4fef..38788a75fb 100644
--- a/sysdeps/unix/sysv/linux/kernel-features.h
+++ b/sysdeps/unix/sysv/linux/kernel-features.h
@@ -81,6 +81,11 @@
/* Support for sendmmsg functionality was added in 3.0. */
#define __ASSUME_SENDMMSG 1
+/* prlimit64 is available in 2.6.36. */
+#if __LINUX_KERNEL_VERSION >= 0x020624
+# define __ASSUME_PRLIMIT64 1
+#endif
+
/* On most architectures, most socket syscalls are supported for all
supported kernel versions, but on some socketcall architectures
separate syscalls were only added later. */
diff --git a/sysdeps/unix/sysv/linux/prlimit.c b/sysdeps/unix/sysv/linux/prlimit.c
index d31980f10c..2996e73b81 100644
--- a/sysdeps/unix/sysv/linux/prlimit.c
+++ b/sysdeps/unix/sysv/linux/prlimit.c
@@ -20,6 +20,7 @@
#include <sys/syscall.h>
+#ifdef __NR_prlimit64
int
prlimit (__pid_t pid, enum __rlimit_resource resource,
const struct rlimit *new_rlimit, struct rlimit *old_rlimit)
@@ -72,3 +73,12 @@ prlimit (__pid_t pid, enum __rlimit_resource resource,
return res;
}
+#else
+int
+prlimit (__pid_t pid, enum __rlimit_resource resource,
+ const struct rlimit *new_rlimit, struct rlimit *old_rlimit)
+{
+ return INLINE_SYSCALL_ERROR_RETURN_VALUE (ENOSYS);
+}
+stub_warning (prlimit)
+#endif
diff --git a/sysdeps/unix/sysv/linux/setrlimit.c b/sysdeps/unix/sysv/linux/setrlimit.c
index 8773c78236..01812ac355 100644
--- a/sysdeps/unix/sysv/linux/setrlimit.c
+++ b/sysdeps/unix/sysv/linux/setrlimit.c
@@ -34,6 +34,7 @@
int
__setrlimit (enum __rlimit_resource resource, const struct rlimit *rlim)
{
+# ifdef __NR_prlimit64
struct rlimit64 rlim64;
if (rlim->rlim_cur == RLIM_INFINITY)
@@ -45,7 +46,11 @@ __setrlimit (enum __rlimit_resource resource, const struct rlimit *rlim)
else
rlim64.rlim_max = rlim->rlim_max;
- return INLINE_SYSCALL_CALL (prlimit64, 0, resource, &rlim64, NULL);
+ int res = INLINE_SYSCALL_CALL (prlimit64, 0, resource, &rlim64, NULL);
+ if (res == 0 || errno != ENOSYS)
+ return res;
+# endif
+ return INLINE_SYSCALL_CALL (setrlimit, resource, rlim);
}
# if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_2)
diff --git a/sysdeps/unix/sysv/linux/setrlimit64.c b/sysdeps/unix/sysv/linux/setrlimit64.c
index db1960fc18..2dd129d99e 100644
--- a/sysdeps/unix/sysv/linux/setrlimit64.c
+++ b/sysdeps/unix/sysv/linux/setrlimit64.c
@@ -36,7 +36,36 @@
int
__setrlimit64 (enum __rlimit_resource resource, const struct rlimit64 *rlimits)
{
- return INLINE_SYSCALL_CALL (prlimit64, 0, resource, rlimits, NULL);
+ int res;
+
+#ifdef __NR_prlimit64
+ res = INLINE_SYSCALL_CALL (prlimit64, 0, resource, rlimits, NULL);
+ if (res == 0 || errno != ENOSYS)
+ return res;
+#endif
+
+/* The fallback code only makes sense if the platform supports
+ __NR_setrlimit. */
+#ifdef __NR_setrlimit
+# if !__RLIM_T_MATCHES_RLIM64_T
+ struct rlimit rlimits32;
+
+ if (rlimits->rlim_cur >= RLIM_INFINITY)
+ rlimits32.rlim_cur = RLIM_INFINITY;
+ else
+ rlimits32.rlim_cur = rlimits->rlim_cur;
+ if (rlimits->rlim_max >= RLIM_INFINITY)
+ rlimits32.rlim_max = RLIM_INFINITY;
+ else
+ rlimits32.rlim_max = rlimits->rlim_max;
+# else
+# define rlimits32 (*rlimits)
+# endif
+
+ res = INLINE_SYSCALL_CALL (setrlimit, resource, &rlimits32);
+#endif
+
+ return res;
}
weak_alias (__setrlimit64, setrlimit64)
--
2.14.1
|