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| author | Michael Meissner <gnu@the-meissners.org> | 2000-11-22 18:26:10 +0000 |
|---|---|---|
| committer | Michael Meissner <gnu@the-meissners.org> | 2000-11-22 18:26:10 +0000 |
| commit | 73dea7905cb5fea2540256bacdfde33fe0ad1a0b (patch) | |
| tree | 1dd1d4630bf2e207f204657c23319050dbf67c9c /newlib/libc/stdlib/system.c | |
| parent | 0217c5bb3b85854cea392d7299706348dc007ae8 (diff) | |
| download | cygnal-73dea7905cb5fea2540256bacdfde33fe0ad1a0b.tar.gz cygnal-73dea7905cb5fea2540256bacdfde33fe0ad1a0b.tar.bz2 cygnal-73dea7905cb5fea2540256bacdfde33fe0ad1a0b.zip | |
Only reference environ indirectly through a pointer
Diffstat (limited to 'newlib/libc/stdlib/system.c')
| -rw-r--r-- | newlib/libc/stdlib/system.c | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/newlib/libc/stdlib/system.c b/newlib/libc/stdlib/system.c index 6a4a33c0b..770996e57 100644 --- a/newlib/libc/stdlib/system.c +++ b/newlib/libc/stdlib/system.c @@ -27,7 +27,7 @@ DESCRIPTION Use <<system>> to pass a command string <<*<[s]>>> to <</bin/sh>> on your system, and wait for it to finish executing. -Use `<<system(NULL)>>' to test whether your system has <</bin/sh>> +Use ``<<system(NULL)>>'' to test whether your system has <</bin/sh>> available. The alternate function <<_system_r>> is a reentrant version. The @@ -107,6 +107,13 @@ system (s) #endif #if defined (unix) && !defined (__CYGWIN__) +extern char **environ; + +/* Only deal with a pointer to environ, to work around subtle bugs with shared + libraries and/or small data systems where the user declares his own + 'environ'. */ +static char ***p_environ = &environ; + static int do_system (ptr, s) struct _reent *ptr; @@ -114,7 +121,6 @@ do_system (ptr, s) { char *argv[4]; int pid, status; - extern char **environ; argv[0] = "sh"; argv[1] = "-c"; @@ -123,7 +129,7 @@ do_system (ptr, s) if ((pid = _fork_r (ptr)) == 0) { - _execve ("/bin/sh", argv, environ); + _execve ("/bin/sh", argv, *p_environ); exit (100); } else if (pid == -1) |