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5c972aa397
*Most significantly, we avoid using setpgid(), because it doesn't work and in fact corrupts the kernel's process group table. *Also, work around tctpgrp() returning garbage instead of 0 on success. This adds an implementation of tcsetpgrp that works by reading the process tables to find a process in the appropriate group. This isn't used for the main job control operations, though, since it might be relatively slow. At this point, basic job control seems to work.
57 lines
934 B
C
57 lines
934 B
C
#include <unistd.h>
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#include <errno.h>
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#ifdef __GNO__
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# include <gno/gno.h>
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# include <gno/kvm.h>
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#endif
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#ifndef __GNO__
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int tc_set_to_my_pgrp(int fd)
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{
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return tcsetpgrp(fd, getpgrp());
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}
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#else
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int tc_set_to_my_pgrp(int fd)
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{
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return tctpgrp(fd, getpid());
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}
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/* We implement tcsetpgrp by searching the process table for a process
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* in the right pgrp and calling tctpgrp using that process.
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*/
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int tcsetpgrp(int fd, pid_t pgrp)
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{
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kvmt *kvm_context;
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struct pentry *proc_entry;
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int result = 1;
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kvm_context = kvm_open();
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if (kvm_context == NULL)
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return -1;
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while ((proc_entry = kvmnextproc(kvm_context)) != NULL) {
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if (proc_entry->pgrp == pgrp) {
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if (tctpgrp(fd, kvm_context->pid) != -1) {
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result = 0;
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break;
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} else {
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result = -1;
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}
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}
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}
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kvm_close(kvm_context);
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if (result == 1) { /* if we didn't find a matching process */
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result = -1;
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errno = ESRCH;
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}
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return result;
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}
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#endif
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