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log: handle strerror_r() versions

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Closes #2563.

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
This commit is contained in:
Christian Brauner 2018-08-22 12:25:16 +02:00
parent 027e437ccb
commit 607e3fcae1
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GPG Key ID: 8EB056D53EECB12D
2 changed files with 37 additions and 15 deletions
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6
configure.ac
View File

@ -619,6 +619,12 @@ AC_HEADER_MAJOR
# Check for some syscalls functions
AC_CHECK_FUNCS([setns pivot_root sethostname unshare rand_r confstr faccessat gettid memfd_create])
# Check for strerror_r() support. Defines:
# - HAVE_STRERROR_R if available
# - HAVE_DECL_STRERROR_R if defined
# - STRERROR_R_CHAR_P if it returns char *
AC_FUNC_STRERROR_R
# Check for some functions
AC_CHECK_LIB(pthread, main)
AC_CHECK_FUNCS(statvfs)

32
src/lxc/log.h
View File

@ -327,21 +327,37 @@ ATTR_UNUSED static inline void LXC_##LEVEL(struct lxc_log_locinfo* locinfo, \
/*
* Helper macro to define errno string.
*/
#if (_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600) && !defined(_GNU_SOURCE) || IS_BIONIC
#define lxc_log_strerror_r \
#if HAVE_STRERROR_R
#ifndef HAVE_DECL_STRERROR_R
#ifdef STRERROR_R_CHAR_P
char *strerror_r(int errnum, char *buf, size_t buflen);
#else
int strerror_r(int errnum, char *buf, size_t buflen);
#endif
#endif
#ifdef STRERROR_R_CHAR_P
#define lxc_log_strerror_r \
char errno_buf[MAXPATHLEN / 2] = {"Failed to get errno string"}; \
char *ptr = NULL; \
{ \
ptr = strerror_r(errno, errno_buf, sizeof(errno_buf)); \
if (!ptr) \
ptr = errno_buf; \
}
#else
#define lxc_log_strerror_r \
char errno_buf[MAXPATHLEN / 2] = {"Failed to get errno string"}; \
char *ptr = errno_buf; \
{ \
(void)strerror_r(errno, errno_buf, sizeof(errno_buf)); \
}
#endif
#else
#define lxc_log_strerror_r \
char errno_buf[MAXPATHLEN / 2] = {"Failed to get errno string"}; \
char *ptr; \
#define lxc_log_strerror_r \
char *ptr = NULL; \
{ \
ptr = strerror_r(errno, errno_buf, sizeof(errno_buf)); \
if (!ptr) \
ptr = errno_buf; \
ptr = strerror(errno); \
}
#endif