?? popen2.c
字號:
#include "apue.h"#include <sys/wait.h>#define PAGER "${PAGER:-more}" /* environment variable, or default */intmain(int argc, char *argv[]){ char line[MAXLINE]; FILE *fpin, *fpout; if (argc != 2) err_quit("usage: a.out <pathname>"); if ((fpin = fopen(argv[1], "r")) == NULL) err_sys("can't open %s", argv[1]); if ((fpout = popen(PAGER, "w")) == NULL) err_sys("popen error"); /* copy argv[1] to pager */ while (fgets(line, MAXLINE, fpin) != NULL) { if (fputs(line, fpout) == EOF) err_sys("fputs error to pipe"); } if (ferror(fpin)) err_sys("fgets error"); if (pclose(fpout) == -1) err_sys("pclose error"); exit(0);}
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