82 righe
1.9 KiB
C
82 righe
1.9 KiB
C
#include "cmGlobal.h"
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#include "cmRpt.h"
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#include "cmErr.h"
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#include "cmExec.h"
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#include <sys/wait.h>
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cmExRC_t cmExecV( cmErr_t* err, int* returnValRef, const cmChar_t* pgmFn, va_list vl0 )
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{
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cmExRC_t rc = kOkExRC;
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int n = 0;
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int i = 0;
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pid_t pid;
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va_list vl1;
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if( pgmFn == NULL )
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return cmErrMsg(err,kInvalidPgmFnExRC,"No executable program file name given in call to %s.",__FUNCTION__);
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// get the count of arguments
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va_copy(vl1,vl0);
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while( va_arg(vl1,cmChar_t*)!=NULL )
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++n;
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va_end(vl1);
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// load argv with ptrs to the args
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cmChar_t* argv[n+2];
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argv[0] = (cmChar_t*)pgmFn;
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for(i=0; i<n+1; ++i)
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argv[i+1] = va_arg(vl0,cmChar_t*);
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argv[n+1] = NULL;
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errno = 0;
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switch( pid = fork())
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{
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case -1:
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rc = cmErrSysMsg(err,kForkFailExRC,errno,"Fork failed.");
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break;
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case 0:
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// we are in the child process - never to return
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execvp(pgmFn,argv);
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// under normal conditions execlp() does not return so we should never get here.
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rc = cmErrSysMsg(err,kExecFailExRC,errno,"Fork to '%s' failed. Is '%s' installed and on the execution path?",pgmFn,pgmFn);
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break;
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default:
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{
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int rv;
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int wrc;
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// we are in the parent process - wait for the child to return
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if((wrc = waitpid(pid,&rv,0))==-1)
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{
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rc = cmErrSysMsg(err,kWaitFailExRC,errno,"Wait failed on call to '%s'.",pgmFn);
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goto errLabel;
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}
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if( returnValRef != NULL )
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*returnValRef = rv;
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if( WEXITSTATUS(rv) != 0 )
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rc = cmErrMsg(err,kPgmFailExRC,"'%s' failed.",pgmFn);
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}
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break;
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}
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errLabel:
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return rc;
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}
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cmExRC_t cmExec( cmErr_t* err, int* returnValRef, const cmChar_t* pgmFn, ... )
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{
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va_list vl;
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va_start(vl,pgmFn);
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cmExRC_t rc = cmExecV(err,returnValRef,pgmFn,vl);
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va_end(vl);
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return rc;
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}
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