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For PR351: 

* Ensure #includes are wrapped with appropriate HAVE_ guards
* Account for variations in time.h and sys/time.h inclusion.
* Add macros for getting wait(2) exit status correctly (per autoconf sugg.)
* Implement ThrowErrno in terms of strerror_r, strerror or none based on
  what is available on the platform.

llvm-svn: 19161
This commit is contained in:
Reid Spencer 2004-12-27 06:17:50 +00:00
parent efda887fe2
commit e925d8b8b2
1 changed files with 59 additions and 5 deletions
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64
llvm/lib/System/Unix/Unix.h
View File

@ -11,24 +11,78 @@
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_SYSTEM_UNIX_UNIX_H
#define LLVM_SYSTEM_UNIX_UNIX_H
//===----------------------------------------------------------------------===//
//=== WARNING: Implementation here must contain only generic UNIX code that
//=== is guaranteed to work on all UNIX variants.
//===----------------------------------------------------------------------===//
#include "llvm/Config/config.h" // Get autoconf configuration settings
#include <unistd.h>
#include <cstdlib>
#include <cstdio>
#include <cstring>
#include <cerrno>
#include <sys/types.h>
#include <sys/param.h>
#include <assert.h>
#include <string>
#include <algorithm>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_SYS_PARAM_H
#include <sys/param.h>
#endif
#ifdef HAVE_ASSERT_H
#include <assert.h>
#endif
#ifdef TIME_WITH_SYS_TIME
# include <sys/time.h>
# include <time.h>
#else
# ifdef HAVE_SYS_TIME_H
# include <sys/time.h>
# else
# include <time.h>
# endif
#endif
#ifdef HAVE_SYS_WAIT_H
# include <sys/wait.h>
#endif
#ifndef WEXITSTATUS
# define WEXITSTATUS(stat_val) ((unsigned)(stat_val) >> 8)
#endif
#ifndef WIFEXITED
# define WIFEXITED(stat_val) (((stat_val) & 255) == 0)
#endif
inline void ThrowErrno(const std::string& prefix) {
char buffer[MAXPATHLEN];
throw prefix + ": " + strerror(errno);
#ifdef HAVE_STRERROR_R
// strerror_r is thread-safe.
strerror_r(errno,buffer,MAXPATHLEN-1);
#elif HAVE_STRERROR
// Copy the thread un-safe result of strerror into
// the buffer as fast as possible to minimize impact
// of collision of strerror in multiple threads.
strncpy(buffer,strerror(errno),MAXPATHLEN-1);
buffer[MAXPATHLEN-1] = 0;
#else
// Strange that this system doesn't even have strerror
// but, oh well, just use a generic message
sprintf(buffer, "Error #%d", errno);
#endif
throw prefix + ": " + buffer;
}
#endif