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#ifndef _RAD_PROCESS_H_ |
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#define _RAD_PROCESS_H_ |
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#include <errno.h> |
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#include <stdio.h> |
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#include <errno.h> |
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#include "paths.h" |
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#if defined(_WIN32) || defined(_WIN64) |
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#include <windows.h> /* DWORD etc. */ |
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typedef DWORD RT_PID; |
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#define getpid _getpid |
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#define execv _execv |
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#define execvp _execvp |
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#ifdef _MSC_VER |
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#include <BaseTsd.h> |
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typedef SSIZE_T ssize_t; |
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#endif |
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#else |
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#include <sys/param.h> |
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#include <sys/types.h> |
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typedef pid_t RT_PID; |
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#endif |
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|
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#include "paths.h" |
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#ifdef __cplusplus |
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extern "C" { |
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attached to the standard output of the child, and subsequent writes |
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to that descriptor in the parent send data to the standard input |
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of the child. The returned r descriptor is set to -1, since |
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there is no output to read from any longer in the child. The |
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there is no longer any output to read from the child. The |
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default w descriptor of 1 will cause the child to act as a filter |
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on the output of the parent. Make sure to call fflush(stdout) first |
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if any data was buffered. It is illegal to set both PF_FILT_INP and |
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PF_FILT_OUT, as a circular process is guaranteed to hang. |
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|
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If you want behavior similar to popen(cmd, "w") (again Unix-only), |
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keeping stdout open in parent, use a duplicate descriptor like so: |
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{ |
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SUBPROC rtp = sp_inactive; |
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FILE *fout; |
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fflush(stdout); |
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rtp.w = dup(fileno(stdout)); |
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rtp.flags |= PF_FILT_OUT; |
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if (open_process(&rtp, cmd_argv) <= 0) { |
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perror(cmd_argv[0]); exit(1); |
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} |
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fout = fdopen(rtp.w, "w"); |
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...write data to filter using fout until finished... |
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fclose(fout); |
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if (close_process(&rtp)) { |
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perror(cmd_argv[0]); exit(1); |
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} |
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...can continue sending data directly to stdout... |
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} |
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We could also have called open_process() after fdopen() above, or after |
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using fopen() on a file if we wanted to insert our filter before it. |
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A similar sequence may be used to filter from stdin without closing |
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it, though process termination becomes more difficult with two readers. |
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Filtering input from a file works better, since the file is then read by |
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the child only, as in: |
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{ |
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SUBPROC rtp = sp_inactive; |
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FILE *fin = fopen(fname, "r"); |
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if (fin == NULL) { |
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open_error(fname); exit(1); |
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} |
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rtp.r = fileno(fin); |
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rtp.flags |= PF_FILT_INP; |
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if (open_process(&rtp, cmd_argv) <= 0) { |
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perror(cmd_argv[0]); fclose(fin); exit(1); |
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} |
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...read filtered file data from fin until EOF... |
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fclose(fin); |
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if (close_process(&rtp)) { |
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perror(cmd_argv[0]); exit(1); |
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} |
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} |
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*/ |
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extern int open_process(SUBPROC *pd, char *av[]); |
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extern int close_processes(SUBPROC pd[], int nproc); |
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extern int process(SUBPROC *pd, char *recvbuf, char *sendbuf, int nbr, int nbs); |
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extern int readbuf(int fd, char *bpos, int siz); |
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extern int writebuf(int fd, char *bpos, int siz); |
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extern ssize_t readbuf(int fd, char *bpos, ssize_t siz); |
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extern ssize_t writebuf(int fd, char *bpos, ssize_t siz); |
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|
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#if defined(_WIN32) || defined(_WIN64) |
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/* any non-negative increment will send the process to IDLE_PRIORITY_CLASS. */ |
