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| -rw-r--r-- | include/ChangeLog | 4 | ||||
| -rw-r--r-- | include/libiberty.h | 27 |
2 files changed, 31 insertions, 0 deletions
diff --git a/include/ChangeLog b/include/ChangeLog index 3c6907f56..f0bc4b37b 100644 --- a/include/ChangeLog +++ b/include/ChangeLog @@ -1,3 +1,7 @@ +2006-03-15 Jim Blandy <jimb@codesourcery.com> + + * libiberty.h (pex_write_input): New declaration. + 2006-02-17 Shrirang Khisti <shrirangk@kpitcummins.com> Anil Paranjape <anilp1@kpitcummins.com> Shilin Shakti <shilins@kpitcummins.com> diff --git a/include/libiberty.h b/include/libiberty.h index c264cb2ab..6fdc6e9d0 100644 --- a/include/libiberty.h +++ b/include/libiberty.h @@ -448,6 +448,33 @@ extern const char *pex_run (struct pex_obj *obj, int flags, const char *outname, const char *errname, int *err); +/* Return a `FILE' pointer FP for the standard input of the first + program in the pipeline; FP is opened for writing. You must have + passed `PEX_USE_PIPES' to the `pex_init' call that returned OBJ. + You must close FP yourself with `fclose' to indicate that the + pipeline's input is complete. + + The file descriptor underlying FP is marked not to be inherited by + child processes. + + This call is not supported on systems which do not support pipes; + it returns with an error. (We could implement it by writing a + temporary file, but then you would need to write all your data and + close FP before your first call to `pex_run' -- and that wouldn't + work on systems that do support pipes: the pipe would fill up, and + you would block. So there isn't any easy way to conceal the + differences between the two types of systems.) + + If you call both `pex_write_input' and `pex_read_output', be + careful to avoid deadlock. If the output pipe fills up, so that + each program in the pipeline is waiting for the next to read more + data, and you fill the input pipe by writing more data to FP, then + there is no way to make progress: the only process that could read + data from the output pipe is you, but you are blocked on the input + pipe. */ + +extern FILE *pex_write_input (struct pex_obj *obj, int binary); + /* Read the standard output of the last program to be executed. pex_run can not be called after this. BINARY should be non-zero if the file should be opened in binary mode; this is ignored on Unix. |