diff options
author | shyouhei <shyouhei@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2007-08-15 19:08:43 +0000 |
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committer | shyouhei <shyouhei@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2007-08-15 19:08:43 +0000 |
commit | d464704f111d211c1f1ff9ef23ef1d755054be00 (patch) | |
tree | b58b17b645dc463322e5fca57fe282360db659c9 /ruby_1_8_5/missing/dup2.c | |
parent | e4f06b3f2dec4b5d6334c5e9907e1cecbf649fc4 (diff) |
add tag v1_8_5_54
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/tags/v1_8_5_54@12952 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Diffstat (limited to 'ruby_1_8_5/missing/dup2.c')
-rw-r--r-- | ruby_1_8_5/missing/dup2.c | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/ruby_1_8_5/missing/dup2.c b/ruby_1_8_5/missing/dup2.c new file mode 100644 index 0000000000..e7cc46f4c1 --- /dev/null +++ b/ruby_1_8_5/missing/dup2.c @@ -0,0 +1,61 @@ +/* + * Public domain dup2() lookalike + * by Curtis Jackson @ AT&T Technologies, Burlington, NC + * electronic address: burl!rcj + * + * dup2 performs the following functions: + * + * Check to make sure that fd1 is a valid open file descriptor. + * Check to see if fd2 is already open; if so, close it. + * Duplicate fd1 onto fd2; checking to make sure fd2 is a valid fd. + * Return fd2 if all went well; return BADEXIT otherwise. + */ + +#include "config.h" + +#if defined(HAVE_FCNTL) +# include <fcntl.h> +#endif + +#if !defined(HAVE_FCNTL) || !defined(F_DUPFD) +# include <errno.h> +#endif + +#define BADEXIT -1 + +int +dup2(fd1, fd2) +int fd1, fd2; +{ +#if defined(HAVE_FCNTL) && defined(F_DUPFD) + if (fd1 != fd2) { +#ifdef F_GETFL + if (fcntl(fd1, F_GETFL) < 0) + return BADEXIT; + if (fcntl(fd2, F_GETFL) >= 0) + close(fd2); +#else + close(fd2); +#endif + if (fcntl(fd1, F_DUPFD, fd2) < 0) + return BADEXIT; + } + return fd2; +#else + extern int errno; + int i, fd, fds[256]; + + if (fd1 == fd2) return 0; + close(fd2); + for (i=0; i<256; i++) { + fd = fds[i] = dup(fd1); + if (fd == fd2) break; + } + while (i) { + close(fds[i--]); + } + if (fd == fd2) return 0; + errno = EMFILE; + return BADEXIT; +#endif +} |