96 lines
1.9 KiB
C
96 lines
1.9 KiB
C
#include <process.h>
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#define _POSIX_
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#include <io.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <fcntl.h>
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#include "../argv.h"
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//These are here because I don't believe in MSVC's prefixing affixation
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#define dup _dup
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#define dup2 _dup2
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#define pipe _pipe
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#define flushall _flushall
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#define fdopen _fdopen
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#ifndef STDIN_FILENO
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#define STDIN_FILENO fileno(stdin)
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#endif
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#ifndef STDOUT_FILENO
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#define STDOUT_FILENO fileno(stdout)
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#endif
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//Introducing a popen which doesn't return until it knows for sure of program launched or couldn't open -Nach
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#define READ_FD 0
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#define WRITE_FD 1
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FILE *safe_popen(char *command, const char *mode)
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{
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FILE *ret = 0;
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char **argv = build_argv(command);
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if (argv)
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{
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int filedes[2];
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if ((*mode == 'r' || *mode == 'w') &&
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!pipe(filedes, 512, (mode[1] == 'b' ? O_BINARY : O_TEXT) | O_NOINHERIT))
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{
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int fd_original;
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FILE *fp;
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if (*mode == 'r')
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{
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fd_original = dup(STDOUT_FILENO);
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dup2(filedes[WRITE_FD], STDOUT_FILENO);
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close(filedes[WRITE_FD]);
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if (!(fp = fdopen(filedes[READ_FD], mode)))
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{
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close(filedes[READ_FD]);
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}
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}
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else
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{
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fd_original = dup(STDIN_FILENO);
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dup2(filedes[READ_FD], STDIN_FILENO);
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close(filedes[READ_FD]);
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if (!(fp = fdopen(filedes[WRITE_FD], mode)))
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{
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close(filedes[WRITE_FD]);
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}
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}
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if (fp)
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{
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int status;
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flushall();
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status = spawnvp(P_NOWAIT, argv[0], (const char* const*)argv);
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if (status > 0)
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{
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ret = fp;
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}
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else
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{
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fclose(fp);
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}
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}
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if (*mode == 'r')
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{
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dup2(fd_original, STDOUT_FILENO);
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}
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else
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{
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dup2(fd_original, STDIN_FILENO);
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}
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close(fd_original);
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}
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free(argv);
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}
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return(ret);
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}
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