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comparison src/os/linux/vm/os_linux.cpp @ 22989:915ca3e9d15e

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8078470: [Linux] Replace syscall use in os::fork_and_exec with glibc fork() and execve() Reviewed-by: stuefe, dsamersoff, dcubed
author dholmes
date Wed, 29 Apr 2015 19:37:10 -0400
parents 8461d0b03127
children 9a23a160ca57
comparison
equal deleted inserted replaced
22988:99edc344d77c 22989:915ca3e9d15e
5927 } 5927 }
5928 5928
5929 5929
5930 extern char** environ; 5930 extern char** environ;
5931 5931
5932 #ifndef __NR_fork
5933 #define __NR_fork IA32_ONLY(2) IA64_ONLY(not defined) AMD64_ONLY(57)
5934 #endif
5935
5936 #ifndef __NR_execve
5937 #define __NR_execve IA32_ONLY(11) IA64_ONLY(1033) AMD64_ONLY(59)
5938 #endif
5939
5940 // Run the specified command in a separate process. Return its exit value, 5932 // Run the specified command in a separate process. Return its exit value,
5941 // or -1 on failure (e.g. can't fork a new process). 5933 // or -1 on failure (e.g. can't fork a new process).
5942 // Unlike system(), this function can be called from signal handler. It 5934 // Unlike system(), this function can be called from signal handler. It
5943 // doesn't block SIGINT et al. 5935 // doesn't block SIGINT et al.
5944 int os::fork_and_exec(char* cmd) { 5936 int os::fork_and_exec(char* cmd) {
5945 const char * argv[4] = {"sh", "-c", cmd, NULL}; 5937 const char * argv[4] = {"sh", "-c", cmd, NULL};
5946 5938
5947 // fork() in LinuxThreads/NPTL is not async-safe. It needs to run 5939 pid_t pid = fork();
5948 // pthread_atfork handlers and reset pthread library. All we need is a
5949 // separate process to execve. Make a direct syscall to fork process.
5950 // On IA64 there's no fork syscall, we have to use fork() and hope for
5951 // the best...
5952 pid_t pid = NOT_IA64(syscall(__NR_fork);)
5953 IA64_ONLY(fork();)
5954 5940
5955 if (pid < 0) { 5941 if (pid < 0) {
5956 // fork failed 5942 // fork failed
5957 return -1; 5943 return -1;
5958 5944
5959 } else if (pid == 0) { 5945 } else if (pid == 0) {
5960 // child process 5946 // child process
5961 5947
5962 // execve() in LinuxThreads will call pthread_kill_other_threads_np() 5948 execve("/bin/sh", (char* const*)argv, environ);
5963 // first to kill every thread on the thread list. Because this list is
5964 // not reset by fork() (see notes above), execve() will instead kill
5965 // every thread in the parent process. We know this is the only thread
5966 // in the new process, so make a system call directly.
5967 // IA64 should use normal execve() from glibc to match the glibc fork()
5968 // above.
5969 NOT_IA64(syscall(__NR_execve, "/bin/sh", argv, environ);)
5970 IA64_ONLY(execve("/bin/sh", (char* const*)argv, environ);)
5971 5949
5972 // execve failed 5950 // execve failed
5973 _exit(-1); 5951 _exit(-1);
5974 5952
5975 } else { 5953 } else {