90 lines
2.2 KiB
C
90 lines
2.2 KiB
C
#include "fd.h"
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#include "sgetopt.h"
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#include "readwrite.h"
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#include "strerr.h"
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#include "substdio.h"
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#include "exit.h"
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#include "fork.h"
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#include "wait.h"
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#include "env.h"
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#include "sig.h"
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#include "error.h"
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#define FATAL "preline: fatal: "
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void die_usage()
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{
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strerr_die1x(100,"preline: usage: preline cmd [ arg ... ]");
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}
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int flagufline = 1; char *ufline;
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int flagrpline = 1; char *rpline;
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int flagdtline = 1; char *dtline;
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char outbuf[SUBSTDIO_OUTSIZE];
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char inbuf[SUBSTDIO_INSIZE];
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substdio ssout = SUBSTDIO_FDBUF(write,1,outbuf,sizeof outbuf);
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substdio ssin = SUBSTDIO_FDBUF(read,0,inbuf,sizeof inbuf);
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void main(argc,argv)
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int argc;
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char **argv;
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{
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int opt;
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int pi[2];
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int pid;
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int wstat;
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sig_pipeignore();
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if (!(ufline = env_get("UFLINE"))) die_usage();
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if (!(rpline = env_get("RPLINE"))) die_usage();
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if (!(dtline = env_get("DTLINE"))) die_usage();
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while ((opt = getopt(argc,argv,"frdFRD")) != opteof)
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switch(opt) {
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case 'f': flagufline = 0; break;
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case 'r': flagrpline = 0; break;
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case 'd': flagdtline = 0; break;
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case 'F': flagufline = 1; break;
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case 'R': flagrpline = 1; break;
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case 'D': flagdtline = 1; break;
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default: die_usage();
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}
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argc -= optind;
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argv += optind;
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if (!*argv) die_usage();
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if (pipe(pi) == -1)
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strerr_die2sys(111,FATAL,"unable to create pipe: ");
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pid = fork();
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if (pid == -1)
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strerr_die2sys(111,FATAL,"unable to fork: ");
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if (pid == 0) {
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close(pi[1]);
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if (fd_move(0,pi[0]) == -1)
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strerr_die2sys(111,FATAL,"unable to set up fds: ");
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sig_pipedefault();
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execvp(*argv,argv);
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strerr_die4sys(error_temp(errno) ? 111 : 100,FATAL,"unable to run ",*argv,": ");
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}
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close(pi[0]);
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if (fd_move(1,pi[1]) == -1)
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strerr_die2sys(111,FATAL,"unable to set up fds: ");
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if (flagufline) substdio_bputs(&ssout,ufline);
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if (flagrpline) substdio_bputs(&ssout,rpline);
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if (flagdtline) substdio_bputs(&ssout,dtline);
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if (substdio_copy(&ssout,&ssin) != 0)
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strerr_die2sys(111,FATAL,"unable to copy input: ");
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substdio_flush(&ssout);
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close(1);
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if (wait_pid(&wstat,pid) == -1)
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strerr_die2sys(111,FATAL,"wait failed: ");
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if (wait_crashed(wstat))
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strerr_die2x(111,FATAL,"child crashed");
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_exit(wait_exitcode(wstat));
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}
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