1 //===- llvm/System/Unix/Unix.h - Common Unix Include File -------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file defines things specific to Unix implementations.
12 //===----------------------------------------------------------------------===//
14 #ifndef LLVM_SYSTEM_UNIX_UNIX_H
15 #define LLVM_SYSTEM_UNIX_UNIX_H
17 //===----------------------------------------------------------------------===//
18 //=== WARNING: Implementation here must contain only generic UNIX code that
19 //=== is guaranteed to work on all UNIX variants.
20 //===----------------------------------------------------------------------===//
22 #include "llvm/Config/config.h" // Get autoconf configuration settings
34 #ifdef HAVE_SYS_TYPES_H
35 #include <sys/types.h>
38 #ifdef HAVE_SYS_PARAM_H
39 #include <sys/param.h>
46 #ifdef TIME_WITH_SYS_TIME
47 # include <sys/time.h>
50 # ifdef HAVE_SYS_TIME_H
51 # include <sys/time.h>
57 #ifdef HAVE_SYS_WAIT_H
58 # include <sys/wait.h>
62 # define WEXITSTATUS(stat_val) ((unsigned)(stat_val) >> 8)
66 # define WIFEXITED(stat_val) (((stat_val) & 255) == 0)
69 /// This function builds an error message into \p ErrMsg using the \p prefix
70 /// string and the Unix error number given by \p errnum. If errnum is -1, the
71 /// default then the value of errno is used.
72 /// @brief Make an error message
74 /// If the error number can be converted to a string, it will be
75 /// separated from prefix by ": ".
76 static inline bool MakeErrMsg(
77 std::string* ErrMsg, const std::string& prefix, int errnum = -1) {
80 char buffer[MAXPATHLEN];
84 #ifdef HAVE_STRERROR_R
85 // strerror_r is thread-safe.
87 strerror_r(errnum,buffer,MAXPATHLEN-1);
89 // Copy the thread un-safe result of strerror into
90 // the buffer as fast as possible to minimize impact
91 // of collision of strerror in multiple threads.
93 strncpy(buffer,strerror(errnum),MAXPATHLEN-1);
94 buffer[MAXPATHLEN-1] = 0;
96 // Strange that this system doesn't even have strerror
97 // but, oh well, just use a generic message
98 sprintf(buffer, "Error #%d", errnum);
100 *ErrMsg = prefix + ": " + buffer;